Development of corrosion-resistant Mg-Al-Ca-Mn-Zn alloy sheet with good tensile properties and stretch formability
Development of corrosion-resistant Mg-Al-Ca-Mn-Zn alloy sheet with good tensile properties and stretch formability
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DOI：
10.1016/j.jallcom.2022.164752
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发表时间：
2022-03
影响因子：
6.2
通讯作者：
T. Nakata;C. Xu;Nurul Aliea Syafiqa binti Osman;L. Geng;S. Kamado
中科院分区：
文献类型：
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作者：
T. Nakata;C. Xu;Nurul Aliea Syafiqa binti Osman;L. Geng;S. Kamado
为了开发汽车用高性能镁合金板材，研究了Al含量对Mg-xAl-0.5Ca-0.4Mn-0.8Zn（质量%，x= 2，5，8，AXMZx 101）合金板材拉伸性能、拉伸成形性和耐腐蚀性的影响。添加5%的Al导致最高极限圆顶高度为6.4 mm。AXMZ 5101合金板还表现出面内各向同性强度和延展性的良好组合。轧制方向的0.2%屈服应力和断裂延伸率分别为193 MPa和24.2%，横向方向的0.2%屈服应力和断裂延伸率分别为188 MPa和23.1%。这种适度的Al添加导致显著改善的耐腐蚀性，在3.5%NaCl溶液中浸泡7天后的腐蚀速率为0.18mm/y，这比商业Mg-Al-Zn合金板的腐蚀速率低约1/4。一个深入的表征表明，这样一个良好的组合拉伸性能和拉伸成形性是与小晶粒尺寸，弱的基础纹理，高的工作硬化性，和激活的nonbasal滑和高耐腐蚀性应实现的致密的氧化物丰富的层的形成。
To develop high-performance magnesium alloy sheets for sheet applications in the automotive industry, we investigated the effects of the Al content on the tensile properties, stretch formability, and corrosion resistances of Mg-xAl-0.5Ca-0.4Mn-0.8Zn (mass%,x= 2, 5, 8, AXMZx101) alloy sheets. The addition of 5% Al led to the highest limiting dome height of 6.4 mm. The AXMZ5101 alloy sheet also exhibited a good combination of in-plane isotropic strength and ductility. The 0.2% proof stress and elongation to failure were 193 MPa and 24.2% for the rolling direction and 188 MPa and 23.1% for the transverse direction, respectively. Such moderate Al addition resulted in a significantly improved corrosion resistance with a corrosion rate of 0.18 mm/y after immersion in a 3.5% NaCl solution for 7 days, which was approximately 1/4 lower than that of a commercial Mg-Al-Zn alloy sheet. An in-depth characterization revealed that such a good combination of tensile properties and stretch formability is associated with the small grain size, weak basal texture, high work hardenability, and activation of nonbasal slips and that a high corrosion resistance should be achieved by the formation of a dense oxide-rich layer.