Jianping Li

East China Normal University | ECNU

CoCrFeNiMn high-entropy alloy coatings were deposited on compacted graphite iron (CGI) by plasma transfer arc cladding to strengthen and improve the wear resistance (performance) of the surface. The effects of different heat treatment processes on the microstructure and mechanical properties of the CoCrFeNiMn coatings were investigated. Compared wi...

Nitrogen pollution resulting from excessive feed consumption poses a significant challenge for modern swine production. Precision nutrition technology seems to be an effective way to solve this problem; therefore, understanding the law of pig body composition deposition is a prerequisite. This study investigated the sex effects on growth performanc...

Tungsten carbide (WC) is widely used in wear-resistant parts due to its excellent wear resistance. Iron-based alloys are used in the repair and remanufacturing of engine components due to their good compatibility with iron-based workpieces. In order to enhance the wear resistance of engine components in service under abrasive conditions, composite...

Simple Summary Corn distillers dried grains with solubles (DDGS) is one of the commonly used feed ingredients in pig production and is usually characterized by high crude fat and high unsaturated fatty acids. However, the effect of adding high levels of DDGS to the diet on the lipid profile of muscle in finishing pigs is unknown. This study aimed t...

In this work, the microstructure, mechanical properties and thermal conductivity of the xNiAl/Fe−20Cr-15Ni-6Al-2Mo (x = 0, 10, 20, 30 wt.%) prepared by mechanical alloying and vacuum hot-pressing sintering were investigated. The experimental results revealed that the primary phases of the material after NiAl addition were the austenite phase, ferri...

Simple Summary Compared with multiparous sows, primiparous sows have poor reproductive performance and insufficient nutritional reserves, resulting in a decreased growth performance in their offspring, which affects the efficiency of pig production. Yeast culture (YC) is rich in nutrients, and the supplementation of yeast culture in gestation and l...

Fe-25Mn-9Al-8Ni-1C-xTi (x = 0, 0.1, 0.2, 0.3, 0.4 wt.%) alloy was prepared by vacuum arc melting method, and the corresponding microstructure, tensile properties and thermal fatigue properties were studied. The results show that the Fe-25Mn-9Al-8Ni-1C-xTi alloy mainly consists of austenitic phase, ferrite phase and TiC phase. Ti element addition ca...

Deoxynivalenol (DON) is a widespread mycotoxin and causes anorexia and emesis in humans and animals; Lactobacillus rhamnosus GG (LGG), a well-characterized probiotic, can improve intestinal barrier function and modulate immune response. Currently, it is unclear whether LGG has a beneficial effect on DON-induced anorexia. In the present study, mice...

TC4 titanium alloy was treated by micro-arc oxidation (MAO) technology, and then CrN coating was prepared on the surface of MAO coating by multi-arc ion plating (MAIP) technology to form MAO/CrN composite film, so as to improve the tribological properties of TC4. The microstructure and phase composition of the film were detected and analyzed by sca...

The impact wear mechanism of compacted graphite cast iron (CGI) at different temperatures (room temperature, 300°C, 400°C, and 500°C) and impact frequencies (10Hz, 12Hz, and 14Hz) was analyzed. The mass losses increase with test temperatures, impact frequencies and numbers. When the temperature increases to 500°C, shallow, deep-spalling, and oxidat...

A low-cost, high performance TiC reinforced titanium matrix composite was successfully fabricated using an in situ reaction casting method. The results showed that the morphology and distribution of TiC in the microstructure were the more important factors affecting the properties of composites. And due to the second phase strengthening of the TiC...

The oxidation kinetics of Cu-Pb bearing alloys was investigated under a temperature domain between 25 and 700 °C. It has been found that during oxidation process, lead was easy to diffuse in the channel formed inside the alloy and form oxide film on the surface of the alloy. The oxides formed by Pb at different oxidation temperatures show different...

The key components in combustion chamber of high power density diesel engines are apt to be damaged rapidly under abnormal combustion. To investigate the surface damage behavior and evolution mechanism of vermicular graphite cast iron in unsteady combustion, a self-developed plasma thermal shock test method was adopted. And the effect of the single...

Al–Mn–Fe alloy was prepared by traditional casting, injection casting, and melt spinning. The effect of cooling rate on the microstructure of alloy was studied. Results show that the phases in the alloy are the same for the three methods, including quasicrystal icosahedral phase (I-phase), Al6Mn phase, and Al phase. With the increase in cooling rat...

High-entropy alloys receive more attention for high strength, good ductility as well as good wear resistance. In this work, CoCrFeNiMn high-entropy alloy (HEA) coatings were deposited on compacted graphite iron through plasma transfer arc at different currents. The microstructure and wear properties of the CoCrFeNiMn HEA coatings were investigated....

In this work, the evolution process, crystallinity, microstructure and morphology of Mg-9Gd-2Y-0.5Zn-0.5Zr (wt%) alloy precipitates were analyzed during isothermal aging at 200 ℃. During the early stages of aging, the precipitate phase distributed in the matrix is mainly the β′′ phase, which exhibits a hexagonal D019 structure. In the peak-aged sta...

In this paper, the mechanism of neutron absorption and common reinforced particles is introduced, and recent research progress on different types of neutron-shielding materials (borated stainless steels, B/Al Alloy, B4C/Al composites, polymer-based composites, and shielding concrete) for transportation and wet or dry storage of spent fuel is elabor...

The as-cast microstructure characteristic and room temperature mechanical properties of Al0.4Co0.5VxFeNi high-entropy alloys (HEAs, where x=0, 0.2, 0.4, and 0.6 in molar ratio, denoted as AC0, AC1, AC2, and AC3, respectively), fabricated by the vacuum arc melting method, were investigated by a combination of optical microscopy, scanning electron mi...

In this study, Fe-25Mn-9Al-8Ni-1C-xNb alloys (x=0, 0.1%, 0.2%, 0.3%, and 0.4%) were prepared by vacuum arc melting, and the effects of Nb content on the stacking fault energy, microstructure, hardness and room temperature tensile properties of the alloys were systematically studied. It is deduced from the literature on the estimation of stacking fa...

Plasma transfer arc cladding technology has been widely utilized in surface engineering, repairing and remanufacturing. In the present work, multiple cladded thick claddings were prepared on compacted graphite cast iron (CGI) substrates with iron-based powders through plasma transfer arc cladding technology using different plasma arc currents to im...

To understand the surface evolution in unsteady thermal environment of diesel engine, piston Al–Si–Cu alloy was ablated by a high frequent pulsing carburizing oxyacetylene combustion. The tested samples displayed good correlation with the characteristics of some bench tested pistons. As the loading cycles increased, the roughness slightly declined...

Atmospheric plasma-sprayed multi-sized porous structures in thermal barrier coatings (TBCs) were constructed with hollow spherical (HOSP) 8YSZ powders and polypropylene pore formers. The mechanical properties of the multi-sized TBCs were investigated through the nanoindentation method as comparations of the as-sprayed coating and those serving at 1...

Rapid-solidification (RS) plus hot press sintering (HPS) technique is adopted to achieve the efficient recovery of discard Mg-Gd-Y-Zn-Zr alloy parts. Ribbons are prepared by melt-spinning method from the discard fragments of GW93 components possess high uniform distribution of Gd and Y elements with a high solubility in α-Mg matrix, fine Mg3(Gd, Y)...

Developments in engine technologies have led to reduction in engine volume and increase in engine power. Thus, valve seat ring components in engines should have high wear resistance. In this study, a high-performance coating on the surface of valve seat material was investigated. The CrAlTiN coating was prepared on the surface of vermicular graphit...

In this study, Fe-25Mn-9Al-8Ni-1C-xTi alloy (x = 0, 0.1, 0.2, 0.3, 0.4 wt.%) was prepared by vacuum arc melting, and the corresponding microstructure and oxidation behavior at 600 °C were studied. The results show that Fe-25Mn-9Al-8Ni-1C-xTi alloy mainly contains austenite phase, ferrite phase and TiC phase. With Ti content increasing, the austenit...

B2-ordered FeAl based materials with 0, 10, 20, 30, 40, 50 and 60 wt.% B2-ordered NiAl reinforced phase were prepared by mechanical alloying with subsequent hot-pressing sintering. The microstructure, mechanical properties and oxidation resistance were investigated. The results showed that after adding NiAl, the main phase was composed of B2-ordere...

Low-expansion alloys are of great importance and can be used for the development of new aerospace materials. Herein, we report diverse rare earth quasicrystal alloys fabricated by the vacuum suction casting process. The effects of the addition of cerium (Ce) on the microstructure, thermal expansion properties and microhardness of the Al-Cu-Fe alloy...

FeAl-based composites with 0, 0.2, 0.5, 0.8 and 1.1 wt.% CNTs were prepared by high-energy ball milling and hot-pressing sintering. The microstructure, mechanical properties and oxidation resistance of CNTs/FeAl composites were tested and analyzed. The results show that the main phases of CNTs/FeAl bulk composites are FeAl phase with B2 structure,...

Al-Si casting alloys are the most commonly used materials for piston alloys. The coefficient of thermal expansion is the key property of a piston material for improving the overall performance and service life of an engine. In the present study, the relationship between the morphology of the excess silicon phase and the coefficient of thermal expan...

A Ti40Zr40Ni20 quasicrystal (QCs) rod and ribbons were prepared by conventional casting and rapid solidification. The X-ray diffractometry (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and differential scanning calorimeter (DSC) techniques were used to investigate the microtissue, phase composition, and solidific...

Refractory high entropy alloys (HEAs) have excellent thermal stability, good strength and toughness, which have great potential application as a second phase in improving microstructure and properties of metal matrix. Here, refractory HEA WTaMoNb is introduced into Cu matrix to synthesize WTaMoNb/Cu nanocomposite by two-step mechanical alloying (MA...

The multi-arc ion plating technology is used to prepare CrN coating on the valve seat material surface. Results show that the surface grains gradually increase in size and becomes less uniform with the increase of the Cr target current. At different Cr target currents, the main phases of the CrN coating are Cr, CrN, and Cr2N. The critical load of t...

Oxidation of Al-Sn bearing alloy occurs during production, processing and use, which reduces both alloy performance and performance of coatings applied to the alloy surface. Therefore, the oxidation mechanism of Al-Sn bearing alloy is studied at 25, 180, 300, and 500 °C. The oxidation morphologies of the alloy were observed by scanning electron mic...

AlN particle–reinforced Mg–Al matrix composites are fabricated by introducing an Al–AlN master alloy in Mg melt during casting. The microstructure, tensile strength, and fracture behavior of the AlN/AZ91 composites are investigated. The introduction of AlN results in a modified dendrite morphology of the β‐Mg17Al12 phase and, thus, improves the mec...

Al 7075 alloy, 15 wt.% VN/7075 composites, and 20 wt.% TiB2-TiCx/7075 composites were prepared by ball milling with subsequent hot-pressing sintering. The microstructure, hardness, and wear properties at room temperature to 200 °C of Al 7075-based composites with different reinforcement phases were discussed. The grain uniformity degree values of 1...

The Al-Si-Cu-Mg-Ni alloy is a commonly used piston alloy. In this work, different amounts of phosphorus modifier and Al-2P (Al-2%P) master alloy modifier were added to the original alloy. The ultrasonic melt treatment method was also applied to improved the microstructure of near-eutectic multi-cast Al–Si alloys. Investigation was performed by mean...

Multi-arc ion plating technology was used to prepare CrN composite anti-friction coating on the surface of vermicular graphite cast iron. The results show that as the Cr target current increases, the surface grains gradually become larger and less uniform，At different Cr target currents, the phases of the CrN coating are Cr, CrN and Cr2N. The criti...

Solid state alloying of immiscible alloy systems such as Cu-Cr is an important field of physical metallurgy. Currently, non-equilibrium techniques are successfully applied in the synthesis of Cu-Cr alloys; however, the mechanism of formation of these alloys remains unclear due to the unavailability of data regarding their microstructure evolution a...

Copper oxide (CuO) has emerged as a promising anode material for lithium-ion batteries (LIBs) due to its high theoretical capacity, low cost and low toxicity to the natural environment. However, the low electronic/ionic conductivity and the imponderable volume expansion problem during the charge and discharge process hinder its practical applicatio...

The evolution of the microstructure and the variation in the thermal expansion properties of the Al 63 Cu 25 Fe 12 alloy by the addition of different amounts of cerium (Ce) are investigated by x-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and differential scanning calorimetry (DSC). Herein, a ne...

The effect of AlN content on the microstructure and mechanical properties of NiAl/Fe–x AlN (x = 0, 3, 5, 10, 15 wt%) alloys were investigated after mechanical alloying with subsequent vacuum hot-pressing sintering. The results showed that the AlN reinforced NiAl/Fe alloy contained B2-ordered NiAl phase, Fe phase and AlN phase. As the AlN content in...

Al–11.5Si–xCu–yNi–Mg alloys with different Cu and Ni contents are prepared. The microstructure of the alloy and phase transformation of Al3CuNi are investigated by X‐ray diffraction (XRD), optical microscope, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy‐dispersive spectrometry (EDS). The nickel‐rich phase i...

Compared with 2D microstructure characterization, quantitative characterization of graphite morphology from 3D perspective can make it more possible to predict and improve properties of cast iron with relatively high accuracy. In the present study, based on 2D metallographic photos, X-ray tomography was utilized to investigate 3D morphology of grap...

The effect of diamond surface pretreatment and content on the microstructure and mechanical properties of NiAl/Fe–x diamond (x=0,5,10,15,and 20 wt.%) alloys was investigated after mechanical alloying with subsequent hot-pressing sintering. The results showed that after the surface pretreatment, a complete transition layer containing W existed on th...

The influence of ultrasonic melt treatment (USMT) at different ultrasonic powers (0, 900, 2400, and 3000 W) on the morphology and chemical composition of Ni‐containing intermetallic phases (T‐Al9FeNi and δ‐Al3CuNi phases) in an Al‐11.5Si‐4Cu‐2Ni‐1Mg‐0.45Fe (wt%) piston alloy is investigated. The morphological characterization reveals that the USMT...

Plasma-sprayed nickel-based self-fusion alloy coatings were annealed in a vacuum at 990, 1020 and 1050 °C for 20 min to increase the bonding between the compacted graphite cast iron substrate and coating, as well as the inner cohesion of the coatings. It was found that nickel and chromium diffused between nickel-based alloy coatings and compacted g...

In this paper, Al7075 alloy and 15 wt% VN/7075 composite were prepared by ball milling and hot-press sintering. The microstructure, hardness, and wear behavior under different working conditions (environmental condition: dry friction, sulfur-containing boundary lubrication, and oil lubrication) were studied. The results showed that the distribution...

Nickel metal hydride (Ni-MH) batteries play an important role in new-energy vehicles; however, the poor high rate dischargeability (HRD) of the negative electrode materials (hydrogen storage alloy) limits its further application in high-power fields. In this work, a facile strategy was applied to improve the HRD performance of AB5-type alloy (LaNi3...

The failure mechanisms of Al-Si-Cu alloy in piston of diesel engine due to abnormal combustion are not fully understood at present. In this paper, the bench test of the original piston was carried out, which induced knock combustion by monitoring of the pressure signal in the cylinder. The results show that the failure process mainly includes the e...

Black microarc oxidation (MAO) ceramic coatings were prepared on TA2 pure titanium by adding the colorant [Cu(NH3)4]²⁺ to a Na2SiO3 base solution. The microstructures of the MAO coatings were characterized by scanning electron microscopy, energy dispersive X-ray spectrometry, and X-ray photoelectron spectroscopy. The corrosion resistance and wear r...

In view of the failure of bearing bush due to their serious friction and wear and in order to improve deposition rate, Cp/AlSn self-lubricate coatings were prepared by magnetron sputtering/multi-arc ion plating. The coatings are uniform and Al, Sn and C elements are evenly mixed. With increasing of carbon target current, the grain sizes become smal...

Dense C/C–SiC composites were prepared by reactive melt infiltration at 1100–1200 °C in vacuum through addition of 20–40 wt% Al into Si powder. XRD and EDS analysis showed that the composites were composed of carbon, SiC, Al and residual Si. The composite with 20% wt.% Al had the maximum compressive strength and modulus, while the composite with 30...

The oxidation mechanism of vermicular graphite cast iron was studied. The oxidation reaction starts from graphites and diffused slowly. Graphites in vermicular graphite are interconnected, coral-like clusters, providing the main oxidation core and channel. The worm-like graphites on the surface are mostly oxidized and form oxide affected zones. The...

It is important to establish the quantitative effect of graphite's 3D morphology on the thermal conductivity of vermicular graphite iron. In the present study, X-ray tomography is utilized to investigate the 3D morphology of graphite in vermicular graphite iron with different vermicularity. A 3D finite element model was built on the basis of graphi...

Two-dimensional FE models of CGI with different pearlite contents for thermal conductivity analysis were established according to the real metallographic images obtained by Pro/E and ANSYS. Meanwhile, thermal conductivity of CGI with different pearlite contents was tested through the laser flash method. It is indicated that the thermal conductivity...

In the present paper, the microstructures of three kinds of in-situ reinforcements Al-Ti-C, Al-Ti-B, and Al-Ti-B-C-Ce were deeply investigated using a combination of scanning electron microscopy, X-ray diffraction spectroscopy, and transmission electron microscopy. The effect of in-situ reinforcements on the room temperature and elevated temperatur...

T6 heat treated piston aluminium alloy (Al-13Si-4Cu-2Ni-1Mg-0.25Mn) were further aged at 350 °C and 420 °C, respectively, for various time (0–1000 h). The microstructures of the re-aged alloy were analyzed using optical microscope (OM, Nicon300) and transmission electron microscope (TEM, JEM-2010). The tensile strengths at room and 350 °C, as well...

Two T6 (500 8C · 3 h, water quenching and 210 8C · 6 h, air cooling) samples of Al-13Si-5Cu-2Ni-1Mg alloy were furture heated to 350 8C and 420 8C, respectively for various times. The tensile strength of the alloy, measured at both room temperature and 350 8C is observed to abnormally increase, especially for the samples that were heated to 420 8C....

The effects of cooling rate 0.15, 1.5, 15, 150, and 1.5 × 105 °C/s on the microstructures and mechanical properties of Al-13Si-4Cu-1Mg-2Ni cast piston alloy were investigated. The results show that with an increase of solidification cooling rate, the secondary dendrite arm spacing (SDAS) of this model alloy can be calculated using the formula D = 4...

The high-temperature oxidation behavior of vermicular iron with different vermicular graphite rates was analyzed at 530 °C for 0–500 h. As the vermicular graphite rate decreased, the oxidation mass gains decreased rapidly. Inside vermicular iron, graphites are interconnected coral-like channels that provide a pathway for oxygen diffusion. The oxide...

The creep behavior accompanying oxidation of a compacted graphite cast iron (CGI) containing Cu, Mo and Sn elements was studied at temperatures ranging from 350 °C to 550 °C and creep loads ranging from 40 MPa to 150 MPa. The creep damage was observed using both optical and scanning electron microscopy (SEM). The results showed that obvious creep d...

In situ formation of Al2O3–ZrO2–Y2O3 composite ceramic coating on ZAlSi12Cu3Ni2 aluminum alloy was successfully prepared by plasma electrolytic oxidation (PEO) technology in a zirconate electrolytic solution. The morphologies, phase components, the thermal diffusion coefficient and thermal conductivity of the composite coatings were investigated by...

A novel thermal-protective coating has been prepared by CPED process on Al-12%Si alloy with the ZrO2 sol addition. The microstructure characteristics and formation mechanism of the coating were investigated by SEM, TEM, EDS, XRD, fourier transform infrared spectrometer (FTIR) and laser particle size analyzer. It was confirmed that the sol particle...

In this paper, Al2O3/7075 composites were prepared by mechanical alloying with subsequent hot-pressing sintering, and the effect of Al2O3 nanoparticle on the mechanical and tribological behavior of 7075 was studied. The mechanical property results showed that the hardness and compressive strength of Al2O3/7075 composites first increased and then de...

In this work, the static corrosion behaviors of Fe(Al), and 20 wt.% Al2O3/Fe(Al) composites with and without 4 wt.% Cr produced by mechanical alloying (MA) and plasma activated sintering (PAS) were investigated. The results showed that the main corrosion failure mode was pitting, and Fe(Al) had higher static corrosion resistance than those of Al2O3...

A cast Al12Si system piston alloy was treated by a modified plasma electrolytic oxidation (PEO) process with different zirconia sol additions in sodium silicate electrolyte. The microstructure characteristics and formation mechanism of the coating were investigated by SEM, TEM, EDS, XRD, fourier transform infrared spectrometer (FTIR) and laser part...

In this work, the corrosion-wear synergistic effect for nanocrystalline Fe(Al), 20 wt.% Al2O3/Fe(Al) composites with and without 4 wt.% Cr in artificial seawater (3.5% NaCl aqueous solution with 60 kg/m3 quartz sand) was investigated. The results showed that the main damage behavior of Al2O3/Fe(Al) composites was a corrosive effect because of its p...

The microstructure, texture and mechanical properties of extruded Mg-5Al-2Nd-0.2Mn alloy were investigated in the present work. The extruded alloy demonstrated a near-completely recrystallized grain structure with average grain size of about 20 μm. Intermetallic phases Al11Nd3 and Al2Nd were fragmented to small particles and a small amount of Mg17A...

Background: Cardiac mast cell (MC) proteases, chymase and tryptase, increase proliferation and collagen synthesis in cultured cardiac fibroblasts. However, the question as to why preventing individually the actions of either protease prevents fibrosis when both are released upon MC activation remains unanswered. Since tryptase has the ability to a...

A triphase composite ceramic coating, Al2O3-ZrO2 together with a small amount of SiO2 was successfully grown on a cast Al-12Si system piston alloy by a novel plasma electrolytic oxidation process with different zirconia sol additions in sodium silicate electrolyte. It was found that the compactness of the coating increased significantly and the hin...

The combined microarc oxidation (MAO) and magnetron sputtering deposition process was used to deposit duplex a-C:H/MAO and Ti-a-C:H/MAO coatings on AM80 magnesium alloy. The microstructure, mechanical properties and tribological behavior of the two duplex coatings were investigated. The experimental results showed that the a-C:H and Ti-a-C:H top fi...

Accumulating evidence indicates that substance P is cardioprotective following ischemia/reperfusion primarily due its potent coronary vasodilator actions. However, an anti-apoptotic effect of substance P has been observed in tenocytes following ischemia, which involved activation of the AKT pathway. This suggests the possibility that substance P al...

Atherosclerosis is a leading cause of disability and death worldwide. Research into the disease has led to many compelling hypotheses regarding the pathophysiology of atherosclerotic lesion formation and the resulting complications such as myocardial infarction and stroke. Herbal medicine has been widely used in China as well as other Asian countri...

Vascular smooth muscle cells (VSMCs) play a crucial role in atherosclerotic lesion formation. Sparstolonin B (SsnB) is a TLR2/TLR4 antagonist that inhibits inflammatory responses in multiple cell types. Herein, we investigated if SsnB inhibited VSMC proliferation, migration, inflammatory response and lipid accumulation. We found that SsnB suppresse...

Estrogen regulation of myocardial chymase and chymase effects on cardiac remodeling are unknown. To test the hypothesis that estrogen prevents pressure overload-induced adverse cardiac remodeling by inhibiting mast cell (MC) chymase release, transverse aortic constriction or sham surgery was performed in 7-week-old intact and ovariectomized (OVX) r...