Researches on the Creep Properties and Microstructures of Mg-Al-Cu Sand-cast Magnesium Alloys
The creep behavior and the microstructures of sand-cast samples of self-designed Mg-Al-Cu based alloys AC33, AC53 and AC63 were studied. It was found that the creep resistance of these alloys at 200 ℃,50 MPa was apparently better than AZ91C,the secondary creep rate of AC53 alloy was the lowest among them. And the ambient temperature mechanical properties of sand-cast experimental alloys are suitable for the demands of the general structural parts. By the means of SEM, XRD and DSC analyses,it was found that all of the three were composed of the phases i.e.δ-Mg,Mg17Al12 ,and Mg2 Al2Cu3, but the microstructures are different. The effects of Cu addition on the elevated temperature creep behaviors could be explained as follows: 1) as solutes, dissolution of Cu in the matrix slowed down the dislocation climb process. 2) Addition of 3％Cu in Mg-(3％ ～6％)Al alloys suppressed production of Mg17Al12 phase.
Creep Magnesium Alloys Microstructures Sand-cast Mechanical Properties
Yang Guangyu Jie Wanqi Zhang Runqiang Hao Qitang Li Jiehua
College of Materials Science and Engineering, Northwestern Polytechnical University,Xian 710071,Chi Northwest Industrial Technology Research Institute,Xian 710072,China
国际会议
The 11th International Space Conference of Pacific-basin Societies(第11届环太平洋国际航天会议)
北京
英文
520-527
2007-05-16（万方平台首次上网日期，不代表论文的发表时间）