Abstract
7050 aluminium alloy is a superior material used in the areas of aerospace and automobile manufacturing. In this work, homogeneous cast cylinder samples of 7050 aluminium alloy with size of Φ80 mm × 100 mm were compressed isothermally at 350°C with compressive strain rate of 0.1 s−1,1 s−1, and 10 s−1, respectively. The samples were then processed into standard tensile specimens, and then tensile testing was done by using the GL8305 universal testing machine. The grain sizes and fracture morphology were analyzed by the SEM observation and cellular automaton (CA) method. The effect of compressive strain rate on microstructure and mechanical properties of 7050 aluminium alloy was investigated. The results show the following. (1) Grain refinement occurred after compression. The grain sizes of the samples decrease with the decrease of compressive strain rate. The grain sizes in the radial edge and the axial center of the cylinder samples are the smallest. (2) The tensile strength and breaking elongation rate were improved when compared to the original alloy. The mechanical properties of samples compressed with compressive strain rate of 0.1 s−1 are the best. (3) The fracture morphology of the samples shows that the fracture of the samples is ductile fracture. The sizes and depths of dimples increased with the decrease of grain sizes.
Highlights
7050 aluminium alloy is widely used in the fields of aerospace, automobile manufacturing, high-speed rail manufacturing, and shipping industry due to its high strength, good toughness, excellent corrosion resistance, and lightweight [1,2,3,4]
(1) Grain refinement occurred after compression. e grain sizes of the samples decrease with the decrease of compressive strain rate. e grain sizes in the radial edge and the axial center of the cylinder samples are the smallest. (2) e tensile strength and breaking elongation rate were improved when compared to the original alloy. e mechanical properties of samples compressed with compressive strain rate of 0.1 s−1 are the best. (3) e fracture morphology of the samples shows that the fracture of the samples is ductile fracture. e sizes and depths of dimples increased with the decrease of grain sizes
7050 aluminium alloy cylinder samples with size of V80 mm × 100 mm were isothermally compressed with three strain rates (0.01 s−1, 0.1 s−1, and 1 s−1) at 350°C. e cylinder samples were processed to standard tensile specimens at room temperature
Summary
7050 aluminium alloy is widely used in the fields of aerospace, automobile manufacturing, high-speed rail manufacturing, and shipping industry due to its high strength, good toughness, excellent corrosion resistance, and lightweight [1,2,3,4]. Research studies have been done to investigate microstructure evolution and mechanical properties of aluminium alloy processed by the hot compression process. Yunzhong et al [12] investigated the grain evolution at different parts of the 7050 aluminium alloy cylinder sample and the result shows the deformation of grain at the central part get larger when the strain increased while the grains becomes smaller and Advances in Materials Science and Engineering more homogeneous. Few investigations have studied the tensile strength and tensile fracture combined with evolution of microstructure of compressed 7050 aluminium alloy. Additional research studies are important to explore the relationship between mechanical behaviours and microstructure of 7050 aluminium alloy resulted from hot compression during the tensile experiment. E effect of strain rate on alloy microstructure and mechanical properties was investigated. Tensile testing was done by using the GL8305 universal testing machine. e microstructure and the grain evolution were observed via EBSD and simulated with the CA method. e effect of strain rate on alloy microstructure and mechanical properties was investigated. e fracture was characterized and analyzed
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