Qinghe Wei's research while affiliated with Harbin Institute of Technology and other places
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Publications (5)
The current study suggested that nano-scale twins in magnesium alloys can significantly affect the elastic limit, ultimate strength and corrosion performance. However, the complicated process of nano-scale twins preparation limits its industrial application. In this paper, the microstructure with submicron twins and precipitates of ZK60 magnesium a...
Most high-performance Mg alloy samples obtained by severe plastic deformation processes are difficult to implement in industrial utilization due to their small size. The strength of large samples developed using the multi-directional forging (MDF) process is significantly lower than that of small samples. This work developed a large commercial AZ80...
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Conventional rare-earth magnesium alloys have high strength but are not accepted by some fields because of their relatively high price. Magnesium alloys with the addition of small amounts of rare earth elements can improve the mechanical properties by severe plastic deformation while saving cost. In this paper, the effects of multidirectional forgi...
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In the traditional hot forging, the temperature of the billet is heated to the forming range, and the die does not need to be heated or only slightly preheated. In isothermal forging, the temperature of the die needs to be heated to the same as that of the billet and kept constant during forging. This paper proposes a new method, which is to contro...
Citations
... This also emphasize the pronounced sensitivity of the CS of the impacted samples to the strain rate [30,45]. Generally, the mechanical properties can be strengthened by solid solution strengthening, grain boundary strengthening, dislocation strengthening, and shear band strengthening [46][47][48][49]. The TEM characteristics was carried out for better understanding for such strengthening machinsm. ...
... In the alpha-Mg matrix, the precipitation of prismatic beta phases and basal gamma phases during creep formed created closed volumes, effectively stopped dislocations and contributing to the higher creep resistance of α-Mg matrix that of most creep-resistant magnesium alloys, including die-cast magnesium benchmark alloys and conventional cast magnesium alloys based on Mg-RE. Zhang et al. [139] prepared a typical Mg-13Gd-6Y-0.2Zr (wt%) by combining isothermal forging and artificial aging. ...
... In past years, the applications of MDF in non-ferrous metals have been carried out. ZHANG et al. [9] prepared large-scale industrial samples of AZ80 alloy with a size of 100 × 100 × 140 mm 3 by two-step MDF process and artificial aging process. After MDF, the yield strength (YS), ultimate tensile strength (UTS) and elongation (EL) of AZ80 alloy increased to 303 MPa, 397 MPa and 11.2%, respectively. ...
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... The limitation on the extent of deformation that may be imparted on a material during processing has been eliminated, largely owing to the experimental advancement of processing techniques in recent years involving the utilization of severe plastic deformation (SPD) like equal-channel angular pressing (ECAP) [3], high-pressure torsion [4], multi-directional forging [5], and cryorolling [6]. Presently, in an ECAP technique, a material sample having a cross-sectional shape identical to that of the channels undergoes deformation via extreme pressure as it is passed through a die featuring two or more channels of equal cross-sectional shapes that intersect at a channel angle denoted by φ, and an outer corner angle represented by Ψ [7]. ...
