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Example of thermogram from the infrared camera during the process of deformation 7xxx series aluminum alloy
Source publication
The continuing high level of demand for lightweight structural materials is the reason for the ever-growing interest in aluminum alloys. The main areas of application for aluminum alloys products are the aerospace and automotive industries. Production of profiles and structural elements from lightweight alloys gives possibility to reduce the curb w...
Contexts in source publication
Context 1
... parameters used for the studies using the infrared technique were shown in Table 2. While in Figure 3 was shown an example TechnoGR from infrared camera which was the basis for temperature determination of the sample during the deformation process. ...
Citations
... Moreover, aluminium is a material that helps to reduce the amount of greenhouse gases emitted into the environment. This is carried out in two ways: thanks to the use of bodies made of aluminium panels, the load capacity of the vehicles is increased, which, in turn, leads to an increase in transport capacity and the possibility of transporting more goods; the weight of the vehicles is further reduced, which helps reduce fuel consumption [1,[17][18][19][20][21]. ...
... The calculations were made using FEM for the three-dimensional state of deformation, taking the thermal phenomena occurring during the applied deformation scheme into account. Numerical modelling of the panel profile extrusion process was performed using the Forge ® NxT software based on the finite element method [18,[22][23][24][25][26]. The main focus of the FEM modelling process in Forge ® NxT was the analysis of the distribution of the abovementioned parameters during the extrusion of three Al alloys and the assessment of their suitability for the actual shaping process in a vertical hydraulic press with a container diameter of 12" and a pressure of up to 3500 T. ...
The paper presents an analysis of the results of numerical tests of the extrusion process of structural panels made of the 5xxx and 6xxx series aluminium alloys in a designed split die. The obtained products are intended for innovative superstructures of special car bodies. The main purpose of the research was the designed split die and numerical simulations and analysis of test results to determine the parameters of the extrusion process. The distribution of stress intensity, strain, strain rate, and temperature in the extruded metal was analysed for two different speeds of the punch movement. On the basis of the analysis of the distribution of stress values occurring in the extrusion process, the conditions enabling the real process of extrusion of the panel profile in industrial conditions in the designed split die were determined. It was shown that panel sections can be produced from ingots with a length of 770 mm on a press with a pressure of 35 MN (12”).
... However, we have not found the data on deformation resistance and structural studies for 7075 aluminum alloy at temperatures of 250, 300, 350, 400, 450 o C and strain rates within 1.0, 10 and 20 s -1 , that is, at temperaturedeformation and rate modes of pressing on the new RSM. In [30], a partial study of the deformation resistance and structure of aluminum alloy 7075 was carried out. However, with these data it is difficult to determine the coefficients of the Avrami equation and to predict the structural change of this alloy during pressing rods on the RSM of a new design. ...
The paper proposes a radial shear mill (RSM) of a new design, which allows manufacturing metal rods of small diameters or wires with a fine-grained structure. The paper presents the results of modeling the evolution of the structure during hot rolling-pressing of aluminum alloy 7075 on the RSM. Mathematical modeling of the technological process was carried out using the MSC.SuperForge, and the empirical Johnson-Mehl-Avrami-Kolmogorov equation was used to predict the passage of softening processes. Due to the absence of the coefficients of the Avrami equation, a series of experiments on physical modeling of the rolling-pressing technological process were conducted on an STD 812 torsion rheometer. The experiments were conducted at the temperature range of 250–450 ℃ and a strain rate of 1.0–20 s-1. By using physical modeling, it was proved that during processing on the RSM, it is necessary to develop a torsional deformation over the entire section of the workpiece, which leads to effective refinement of the structure. The derived formulas and simulation modeling of the obtained values of the stress-strain state (SSS) were used to simulate the technology of the combined process. Moreover, rational temperature-rate conditions were determined to deform the workpiece on the RSM. It was proved by mathematical modeling that shear deformations develop along the entire section of the workpiece during processing on the RSM, which leads to effective refinement of the structure and the formation of a fine-grained structure in the rods, i. e. products of the required quality are manufactured
The extensive applications of aluminium alloy in the automotive and aerospace industries promote the current research activity. The present research work focuses on the enhancement of the mechanical and wear properties of AA7050. The aluminium composites were synthesized utilizing the liquid metallurgy processing route, with titanium dioxide at different weight percentages. The microstructural analysis exhibited the increase in grain size and uniform scatter of reinforcement in the matrix material. Also, the properties of the AA7050 composite, such as density, hardness, tensile strength, and wear behaviour, were studied. The properties of AA7050 composite, such as hardness, tensile strength, and wear resistance, increased up to 5 wt.% titanium dioxide addition, and beyond that, it shows a reduction. The microscopic examinations on the AA7050 composite samples after the tensile test and wear test revealed failure modes.
