Effect of partial rolling and heat treatment on the microstructure and mechanical properties of AZ80 Mg joint
Effect of partial rolling and heat treatment on the microstructure and mechanical properties of AZ80 Mg joint
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DOI：
10.1016/j.msea.2015.08.046
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发表时间：
2015-10
期刊：
影响因子：
6.4
通讯作者：
Chai Sensen;Dingfei Zhang;T. Tang;F. Guo;F. Pan
中科院分区：
文献类型：
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作者：
Chai Sensen;Dingfei Zhang;T. Tang;F. Guo;F. Pan
对AZ80镁合金接头进行了300℃、350℃和400℃的固溶处理和部分轧制处理，然后进行180℃时效处理。随着轧制温度的升高，再结晶率增加，应变硬化效应减弱，从而减少了焊缝的裂纹倾向。在350℃左右轧制，应变硬化和细晶强化得到了很好的结合，可以有效地消除焊缝中的气孔，使拉伸性能显著提高。在部分轧制接头的不同区域，相的析出行为不同。球状的Mg17Al12相倾向于在变形组织中析出，尤其是孪晶内部。而孪晶内部由于取向不良，不会形成连续相和胞状不连续相。时效处理过程中，析出相的钉扎作用使接头进一步强化。
AZ80 Mg alloy joints were submitted to solution treatment, partial rolling processes at 300 °C, 350 °C and 400 °C, and subsequently aging treatment at 180 °C. As the rolling temperature increased, recrystallization ratio increased and strain hardening effect was weakened which could reduce the crack tendency in the weld. Rolling at around 350 °C, strain hardening and fine grain strengthening obtained a good combination; the porosity in the weld can be effectively eliminated, resulting in significant improvement of tensile properties. The precipitation behavior of Mg17Al12phase was different in various areas of the partially rolled joints. Spherical Mg17Al12phase preferred to precipitate in the as-deform microstructure, in particular inside the twins. While continuous Mg17Al12phase and cellular discontinuous Mg17Al12phase would not form inside the twins due to the unfavorable orientation. The pinning effect of Mg17Al12precipitates led to further strengthening for the joints during the aging treatment.