Microstructure and corrosion behavior of AZ31 alloys prepared by dual directional extrusion
Microstructure and corrosion behavior of AZ31 alloys prepared by dual directional extrusion
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DOI：
10.1016/j.matdes.2011.12.023
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发表时间：
2012-04
影响因子：
8.4
通讯作者：
Liwei Lu;Tianmo Liu;J. Chen;Zhongchang Wang
中科院分区：
文献类型：
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作者：
Liwei Lu;Tianmo Liu;J. Chen;Zhongchang Wang
报道了AZ31镁合金经大塑性变形双向挤压(DDE)后的组织演变和腐蚀行为。为了比较，还考虑了AZ31合金的正挤压(FE)技术。随着挤压倍数的增加和挤压温度的降低，DDE挤压样品的平均晶粒明显细化，从而提高了材料的抗盐腐蚀性能。DDE挤压的合金比FE挤压的合金具有更好的耐腐蚀性，这是由于DDE的动态再结晶使其组织更细小，组织更均匀，位错密度更低。
Microstructure evolution and corrosion behavior of Mg alloys AZ31 processed by a severe plastic deformation technique, dual directional extrusion (DDE) are reported. The forward extrusion (FE) technique is also taken into account on the AZ31 alloys for comparison. Mean grains for the samples extruded by the DDE are refined significantly with increased extrusion ratio and lowered extrusion temperature, which as a result enhance resistance against salt corrosion. The alloys extruded by the DDE exhibit better corrosion resistance than those by the FE, which is explained by the finer grains, more homogeneous microstructure, and lower density of dislocation in the DDE-ed samples owing to the dynamic recrystallization.