摘要
The cyclic extrusion compression （CEC） process was introduced into the AM60B magnesium alloy. The use of the CEC process was favorable for producing finer microstructures. The results show that the microstructure can be effectively refined with increasing the number of CEC passes. Once a critical minimum grain size was achieved, subsequent passes did not have any noticeable refining effect. As expected, the fine-grained alloy has excellent mechanical properties. The micro-hardness, yield strength, ultimate tensile strength and elongation to failure of two-pass CEC formed alloy are 72.2, 183.7 MPa, 286.3 MPa and 14.0%, but those of as-cast alloy are 62.3, 64 MPa, 201 MPa and 11%, respectively. However, there is not a clear improvement of mechanical properties with further increase in number of CEC passes in AM60B alloy. The micro-hardness, yield strength, ultimate tensile strength and elongation to failure of four-pass CEC formed alloy are 73.5, 196 MPa, 297 MPa and 16%, respectively.
通过往复挤压(CEC)变形来细化AM60B镁合金的组织。结构表明:随着CEC道次的增加,组织得到明显细化。当材料达到临界最小晶粒尺寸时,进一步挤压变形也很难使组织得到明显的细化。细小的组织具有优异的力学性能,合金的硬度、屈服强度、抗拉强度和断后伸长率分别由铸态的62.3、64 MPa、201 MPa和11%上升到二道次变形后的72.2、183.7 MPa、286.3 MPa和14.0%。但是再进一步挤压变形材料的力学性能增加幅度不明显,经四道次挤压变形后其硬度、屈服强度、抗拉强度和断后伸长率分别为73.5、196 MPa、297 MPa和16%
基金
Projects(ZD20081901,QC2010110,QC2012C006)supported by the Natural Science Foundation of Heilongjiang Province,China
Project(2012RFQXS113)supported by Special Fund Project for Scientific and Technological Innovation Talents of Harbin,China
Project(201210214008)supported by Training Programs of Innovation and Entrepreneurship for Undergraduates,China
作者简介
Corresponding author： Tian CHEN; Tel： ＋86-451-86392518; E-mail： chentian0225@ 163.com
