Improvement of deep drawing formability of Mg-6Al-1Zn magnesium alloy sheets with high strength utilizing aging precipitation
Improvement of deep drawing formability of Mg-6Al-1Zn magnesium alloy sheets with high strength utilizing aging precipitation
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DOI：
10.1016/j.scriptamat.2022.114709
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发表时间：
2022-03-31
影响因子：
6
通讯作者：
Chino, Yasumasa
中科院分区：
文献类型：
--
作者：
Huang, Xinsheng;Bian, Mingzhe;Chino, Yasumasa
研究了时效析出对Mg - 6Al - 1Zn（AZ61）合金板材微观结构、深冲成形性和拉伸性能的影响。在175℃时效96小时的高强度合金，当变形温度从室温略微升高到100℃时，其深冲成形性有显著改善，极限拉深比（LDR）从1.5提高到1.9。这个1.9的极限拉深比甚至大于未时效合金在100℃下拉伸时的1.75。深冲成形性的提高可归因于防止了拉深杯边缘的开裂，这与Mg₁₇Al₁₂析出物对拉伸孪晶生长和基面滑移的限制密切相关，从而导致变形过程中织构强化延迟。所提出的利用时效析出的思路为开发具有优异深冲成形性和高强度的镁合金板材提供了一种新策略。
The effects of aging precipitation on microstructure, deep drawing formability and tensile properties, were investigated for Mg-6Al-1Zn (AZ61) alloy sheets. The alloy aged at 175 degrees C for 96 h with high strength exhibited a significant improvement in deep drawability with an increased limiting drawing ratio (LDR) from 1.5 to 1.9, when slightly increasing deformation temperature from room temperature to 100 degrees C. This LDR (1.9) was even larger than that (1.75) of the unaged alloy drawn at 100 degrees C. The improved deep drawability can be attributed to the prevention of cracking at the edge of drawn cup, which is closely related to the restrictions of growth of tensile twins and basal slip due to Mg17Al12 precipitates, resulting in the delayed texture strengthening during deformation. The proposed idea of utilizing aging precipitation provides a new strategy for the development of Mg alloy sheets with superior deep drawing formability and high strength.