Microstructure and tensile behavior of an AZ31 magnesium alloy processed by high-pressure torsion
Microstructure and tensile behavior of an AZ31 magnesium alloy processed by high-pressure torsion
复制标题
AZ31镁合金高压扭转显微组织与拉伸行为
DOI：
--
复制
发表时间：
2015
影响因子：
4.5
通讯作者：
Terence G. Langdon
中科院分区：
文献类型：
--
作者：
Jie Xu;Xinwei Wang;Mahmood Shirooyeh;Guangnan Xing;Debin Shan;Bin Guo;Terence G. Langdon
在室温下，施加6.0 GPa的高压扭转（HPT）处理AZ31镁合金。显微组织分析表明，HPT处理使晶粒细化，晶粒尺寸从初始退火条件下的~35 μm减小到10次HPT处理后的~110 nm。显微硬度测量表明，经过十圈的加工，整个磁盘的硬度均匀性达到了合理的水平。拉伸试验结果表明，高温高温热处理后的超细晶AZ31合金具有良好的延展性，在较低的423 K温度下，合金的最大伸长率可达400%。结果表明，经HPT十匝加工的UFG AZ31镁合金具有很强的微成形应用潜力。
An AZ31 magnesium alloy was processed by high-pressure torsion (HPT) at room temperature under an imposed pressure of 6.0 GPa. Microstructural analysis showed that the HPT processing introduced significant grain refinement with a reduction in grain size from ~35 μm in the initial annealed condition to ~110 nm after ten turns of HPT. Microhardness measurements showed that a reasonable level of hardness homogeneity was achieved across the disk processed through ten turns. The results from tensile testing demonstrated that the ultrafine-grained (UFG) AZ31 alloy processed by HPT exhibits high ductility with a maximum elongation of ~400 % at the relatively low testing temperature of 423 K. The results confirm that the UFG AZ31 magnesium alloy processed by HPT through ten turns has a strong potential for use in micro-forming applications.