Effect of Zn and Mg Content on Crashworthiness of Al-Zn-Mg Alloy Thin-Walled Square Extrusions

Materials

Cheng Wang¹  Hui Guo¹  Jin Zhang¹  Yunlai Deng² 

[1] Light Alloy Research Institute, Central South University, Changsha 410083, China;State Key Laboratory of High Performance and Complex Manufacturing, Central South University, Changsha 410083, China;

关键词: Al-Zn-Mg alloy;    extrusion;    crashworthiness;    mechanical property;    axial compression;   

DOI  :  10.3390/ma13214791

来源: DOAJ

【 摘 要 】

The effects of Zn and Mg content in thin-walled square extrusions of Al-Zn-Mg alloys on its crashworthiness were investigated, and the correlation between the crushing properties, mechanical properties, and microstructures of the profiles were investigated. The results showed that the strength and the compression properties were gradually increased with a decrease in the Zn/Mg ratios (from 12.48 to 4.57). When the Zn/Mg ratio is lower (less than 6.29), an increase in the Mg content simultaneously improves the alloy strength and the compression properties. An increase in Zn content (from 5.07 to 6.77) can improve the strength of the alloy however, it does not affect the compression properties. However, the higher Zn contents (6.77%) would lead to cracking in advance during the compressing, which reduces the compression energy absorption capacities of the product. Therefore, in order to obtain higher strength and excellent compression properties, the Zn/Mg ratio should be reduced. For the upper limit, the Zn content should not be too high (less than 6.77), as this may lead to early cracking and failure. For the lower limit, the Mg content should be higher (more than 0.91) to make sure that the alloy has excellent compression properties and higher strength.

【 授权许可】

Unknown