METALS AND METAL MATRIX COMPOSITES |
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Effect of Cr and Mn on Crushing Properties of Aluminum Alloy Profiles for Automobile |
WAN Li1,2,*, ZHANG Qi1, ZHANG Yong1, TANG Jianguo1, DENG Yunlai1
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1 School of Materials Science and Engineering, Central South University, Changsha 410083, China 2 Guangdong Fenglu Aluminum Co., Ltd., Foshan 528000, Guangdong, China |
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Abstract In this work, the effect of Cr and Mn content on the collapsibility of aluminum alloy profiles for automobile was studied by using the plastic deformation behavior of profiles during full section compression. The results show that the addition of Cr and Mn can effectively inhibit the recrystallization and grain growth during extrusion. When the content of Cr and Mn is 0.09%, the profile is completely coarse-grained; as the content of Cr and Mn is 0.23%, there are only coarse grain layers with a thickness of 400 μm; while the content of Cr and Mn is 0.51%, the whole section of the profile is uniform and has fine fibrous structure. In the later stage of deformation, the non-uniform plastic deformation behavior cha-racterized by necking is obvious for profiles with fine grain structure. This stage produces about 4% (A50) elongation, which greatly improves the local deformation ability of profiles. The crushing energy of fine-grained profiles (10.6 kJ) increases, compared with that of coarse-grained profiles (5.5 kJ). Evidently, the fine grains show a better energy absorption effect.
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Received: 25 September 2022
Published: 25 September 2022
Online: 2022-09-26
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Fund:The Foshan Key Technology Project (1920001000409). |
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