Creep behavior and creep mechanism of Mg-Gd-Y-Sm-Zr alloy

被引：19
作者：
Chen, Xiaoya [1 ,2 ]
Li, Quanan [1 ,2 ,3 ]
Zhou, Yao [1 ]
Chen, Peijun [4 ]
机构：
[1] Henan Univ Sci & Technol, Sch Mat Sci & Engn, Luoyang 471023, Peoples R China
[2] Prov & Ministerial Coconstruct Collaborat Innovat, Luoyang 471023, Peoples R China
[3] Longmen Lab, Luoyang 471000, Peoples R China
[4] Luoyang Shengya Magnesium Alloy Sci & Technol Co L, Luoyang, Peoples R China
来源：
VACUUM | 2023年 / 212卷
基金：
中国国家自然科学基金;
关键词：
Mg-11Gd-2Y-3Sm-0; 5Zr alloy; Creep property; Microstructure; Creep mechanism; WT.PERCENT ALLOY; MICROSTRUCTURE EVOLUTION; TENSILE;
D O I：
10.1016/j.vacuum.2023.112009
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this work, Mg-11Gd-2Y-3Sm-0.5Zr (GWS1123) alloy was arranged by vacuum melting and gas protection. The tensile mechanical properties at 20-300 degrees C and the creep properties at 200-300 degrees C/50-110 MPa were tested by tensile and creep testing machines, respectively. The microstructure changes were investigated by transmission electron microscopy before and after creep, and the strengthening mechanism and creep mechanism were dis-cussed. In addition to its superior tensile strength at room and high temperatures, GWS1123 alloy exhibits excellent creep properties at high temperatures. At 250 degrees C, the ultimate tension strength and tensile yield strength are 319 MPa and 246 MPa, respectively, which are 26.6% and 22.4% higher than the ultimate tension strength (252 MPa) and tensile yield strength (201 MPa) at room temperature. The alloy has good creep resis-tance at 200-250 degrees C/50-110 MPa and 300 degrees C/50 MPa. The effect of creep temperature on the creep resistance is greater than that of stress. The creep mechanism of GWS1123 alloy at 200-300 degrees C/50-110 MPa is mainly grain boundary slip, dislocation slip and climb. It is the good heat resistance, strong Orowan strengthening effect and obvious coherent strengthening effect of beta ' phase that are responsible for the high temperature strength and high temperature creep resistance.
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页数：7
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