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.

中文翻译：

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时效时间对汽车安全部件Al-0.5Mg-0.4Si合金破碎性能的影响

通过拉伸试验和耐压试验，研究了时效时间对用于汽车安全部件的Al-0.5Mg-0.4Si合金的耐压性能的影响。此外，通过透射电子显微镜（TEM）研究了合金的微观结构。结果表明，在局部变形延展性指数，ΔA _ABS，其被定义为总延伸率和均匀延伸率的Al-0.5mg的-0.4Si合金，之间的差分别为6.5％，7.0％和8.5％，在老化后在210°C下持续1、3和6 h，这种趋势与破碎性能相同。TEM结果表明，在210°C老化1 h，3 h和6 h后，晶界析出物（GBPs）的间距分别为94.9、193.6和408.2 nm，这种趋势与Pb的趋势相同。ΔA_腹肌。关于GBPS的间距和延展性指数之间的关系的机构ΔA _ABS已经提出基于围绕Gbps的局部变形。支持Gbps间距的增加，ΔA_腹肌增加，并且粉碎性能得到改善。