Effect of Aging Time on Crushing Performance of Al-0.5Mg-0.4Si Alloy for Safety Components of Automobile

Metals

Daxiang Sun¹  Qingrong Ran²  Xin Zhan³  Yuping Li³  Jinkun Lu³  Jianguo Tang³  Lehang Ma³  Lingying Ye³  Yong Zhang³  Haichun Jiang⁴ 

[1] Center for Industrial Analysis and Testing, Guangdong Academy of Sciences, Guangzhou 510650, China;MINTH Research and Development Center, Ningbo 315800, China;School of Materials Science and Engineering, Central South University, Changsha 410083, China;Zhejiang Minneng Technology Co., Ltd., Huzhou 313300, China;

关键词: Al-Mg-Si alloy;    aging time;    crushing performance;    grain boundary precipitate;    localized deformation;   

DOI  :  10.3390/met11040608

来源: DOAJ

【 摘 要 】

The effect of aging time on the crushing performance of Al-0.5Mg-0.4Si alloy used for safety components of automobile was investigated by tensile test and crush test. Moreover, the microstructure of the alloy was investigated by transmission electron microscopy (TEM). The results show that the localized deformation ductility index, ΔA_abs, which is defined as the difference between total elongation and uniform elongation, of Al-0.5Mg-0.4Si alloy is 6.5%, 7.0% and 8.5%, respectively, after being aged at 210 °C for 1, 3 and 6 h, and this tendency is the same as that of the crushing performance. The spacing of grain boundary precipitates (GBPs) from TEM results are found to be 94.9, 193.6 and 408.2 nm after being aged at 210 °C for 1, 3 and 6 h, respectively, and this tendency is same to that of ΔA_abs. A mechanism about the relation between the spacing of GBPs and the ductility index ΔA_abs has been proposed based on localized deformation around GBPs. With the increase of GBPs spacing, the ΔA_abs increases, and the crushing performance is improved.

【 授权许可】

Unknown