高硬度Mg-5Al-2Sn-5Ca镁合金在铸态与热处理后的蠕变行为

doi:10.11896/cldb.19060026

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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.

Key words： as-cast heat-treatment Mg alloy skeleton phase micro-Vickers hardness creep time

Published: 29 May 2020

CLC number:

TG146.2+2

Fund:This work was financially supported by the National Natural Science Foundation of Liaoning Province (20170540494).

About author:: Yan Re is currently a lecturer of College of Liaoning Provincial Communications,and obtained his Ph.D from University of Technology Shenyang in Sep. 2015. He is presiding over one of the Natural Science Foundation of Liaoning Province, and has published more than 10 journal papers, applied 4 national invention patents and 1 of them were authorized. His research interests are include study on preparation and application of metallic glasses composites, study on preparation application of heat-resistant magnesium alloy.
Keqiang Qiu is a professor and doctoral supervisor in University of Technology Shenyang. He obtained his Ph.D. from Institute of metal research of Chinese Academy of Sciences in Jan. 2002. He is this vice-chairman of Liaoning Foundry Association, and director of Liaoning Institute of Mechanical Engineering, leading talent of Shenyang city Currently. He has published more than 120 journal papers and included 80 papers in SCI and EI. He has applied 22 national invention patents and 7 of them were authorized. His research interests are consist of study on preparation and application of metallic glasses composites, study on solidification and relaxation effect of metallic glasses, development of high strength structural steel, multi-field coupling analysis of process simulation and defects in large casting steel, catalytic characteristics and application of low dimensional metastable materials. Professor Qiu has trained these 15 doctors and more than 50 masters.

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Cite this article:

RE Yan,QIU Keqiang,LI Donghe, et al. Investigation on Creep Behavior of Mg-5Al-2Sn-5Ca Magnesium Alloy with High Hardness in As-cast and After Heat-treatment[J]. Materials Reports, 2020, 34(12): 12076-12082.

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http://www.mater-rep.com/EN/10.11896/cldb.19060026 OR http://www.mater-rep.com/EN/Y2020/V34/I12/12076

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