Investigation on Creep Behavior of Mg-5Al-2Sn-5Ca Magnesium Alloy with High Hardness in As-cast and After Heat-treatment
RE Yan1, QIU Keqiang2, LI Donghe1, DING Ren1, WANG Mei1, XU Hui1, XU Ying1
1 Department of Mechanical and Electronic Engineering, College of Liaoning Provincial Communications, Shenyang 110122, China 2 School of Materials Science and Engineering, University of Technology Shenyang, Shenyang 110870, China
Abstract: In this work, a new Mg-5Al-2Sn-5Ca magnesium alloy was prepared by adding common elements such as Al, Ca and Sn by using the design ideas of MRI230D alloy.The composition of the alloy was determined by XRD, the microstructure and creep fracture of the alloy were observed by SEM, and the hardness of the alloy in as-cast and after heat-treatment was measured by image processing micro-Vickers hardness tester. The creep fracture time and creep elongation of the alloy in as-cast and after heat-treatment were measured by creep testing machine at 50 MPa/200 ℃. The XRD results showed that the alloy was composed of α-Mg, Al2Ca, Mg2Ca, CaMgSn phase. It was observed by SEM that there were continuous skeleton phases at the grain boundary of the alloy in as-cast and after heat-treatment, and there were tiny particles precipitated in the grains after heat treatment. The alloy had higher Vickers hardness in as-cast and after heat-treatment, and the temperature of phase transformation was 520 ℃, which indicated that the alloy had high heat resistance. Creep tests were performed on as-cast and heat-treated alloys at 50 MPa/200 ℃, respectively. The results showed that compared to in as-cast alloys, the total creep time of the alloy after heat-treatment was extended to 540 h, and the total creep decreased 0.001%, but the creep variable at 100 h was reduced by 0.030%. Compared with the creep data of other researchers, under the same conditions, the creep properties of the as-cast alloy were much better than those of the MRI153 magnesium alloy; the creep fracture time of the alloy after heat treatment at 50 MPa/200 ℃ was also longer than that of A380 aluminum alloy.
热焱, 邱克强, 李东和, 丁韧, 王梅, 徐慧, 徐颖. 高硬度Mg-5Al-2Sn-5Ca镁合金在铸态与热处理后的蠕变行为[J]. 材料导报, 2020, 34(12): 12076-12082.
RE Yan, QIU Keqiang, LI Donghe, DING Ren, WANG Mei, XU Hui, XU Ying. Investigation on Creep Behavior of Mg-5Al-2Sn-5Ca Magnesium Alloy with High Hardness in As-cast and After Heat-treatment. Materials Reports, 2020, 34(12): 12076-12082.
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2020, Vol. 34 
