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Microstructure and mechanical properties of sand-cast Mg-6Gd-3Y-0.5Zr alloy subject to thermal cycling treatment

查看全文 作　　者：Beiping [1]Zhou;Wencai [1]Liu;Guohua [1]Wu;Liang [1]Zhang;Xiaolong [1]Zhang;Hao [1]Ji;Wenjiang [1]Ding 高影响力作者 机构地区：[1]National Engineering Research Center of Light Alloy Net Forming and Key State Laboratory of Metal Matrix Composites,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai,200240,China高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2020年第36卷第8期,共12页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(Nos.51771115 and 51775334);the National Science and Technology Major Project(No.2017ZX04006001);the Joint Fund for Space Science and Technology(Nos.6141B06310106 and 6141B06300401);the Research Program of Joint Research Center of Advanced Spaceflight Technologies(No.USCAST2016-18)。 摘　　要：This work was undertaken to investigate the microstructural evolution, mechanical properties and fracture behavior of sand-cast Mg-6 Gd-3 Y-0.5 Zr(GW63) alloy subject to thermal cycling treatment. In order to simulate the thermal cycling under extreme service conditions(space or moon environments), the sand-cast and T6 treated GW63 alloys were subjected to thermal cycling treatment which consists of deep cryogenic-elevated temperature cycling treatment(DCET) and deep cryogenic cycling treatment(DCT). Results indicate that there are significant gains in yield strength(YS) and ultimate tensile strength(UTS) of the sand-cast GW63 alloy after DCET, whereas the T6 state alloy undergoes a different variation in mechanical properties. However, no appreciable influence is revealed on the mechanical properties of the tested GW63 alloys after DCT. Meanwhile, the DCT and DCET have no obvious effects on the fracture morphology. The DCT enhances the precipitation kinetics via providing favorable nucleation sites for the precipitation of second phases. The elevated temperature process of DCET plays a crucial role in improving the aging-hardening responses and releasing the stress concentration brought by DCT to a great extent, leading to overcome the obstacle of essential phase transformation. The changes in mechanical properties are primarily attributed to the phase transformation of the studied alloys during DCET. 关 键 词：MG-GD-Y-ZR Deep cryogenic-elevated temperature CYCLING Deep cryogenic cycling Mechanical properties Microstructure evolution
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