Effect of forging temperature on the microstructure,subsequent aging precipitation behavior,and mechanical properties of Mg-Gd-Y-Zr-Ag alloy  

作　　者：Yingjie Huang Yingchun Wan Chuming Liu Shunong Jiang Yonghao Gao Zhiyong Chen 

机构地区：[1]School of Materials Science and Engineering,Central South University,Changsha 410083,China [2]Light Alloy Research Institute,Central South University,Changsha 410083,China [3]Hunan Meiyu Technology Co.Ltd.,Yueyang 414000,China

出　　处：《Journal of Materials Science & Technology》2024年第14期41-57,共17页材料科学技术（英文版）

基　　金：supported by the National Key R&D Program of China(No.2021YFB3701100).

摘　　要：The deformation mechanism,microstructure evolution,and precipitation behavior of a Mg-8.9Gd-1.8Y-0.5Zr-0.2Ag(wt.%)alloy multi-directionally forged at three different temperatures were investigated.As the forging temperature increases,the particle-stimulated nucleation(PSN)effect diminishes as the num-ber of dynamic precipitates decreases,pyramidal slip is activated,grain boundary migration accelerates,and continuous dynamic recrystallization(CDRX)dominates.The microstructures varied greatly,although fine-grained structures were formed at all different forging temperatures.Competitive precipitation be-tween dynamic precipitate growth,dislocation-induced precipitation,and homogeneous precipitation was observed after aging treatment.Among them,the medium temperature(748 K)forged and aged alloy ex-hibits the best mechanical performance,with an ultimate tensile strength of 436 MPa,and elongation of 16.3%.The calculation indicates that the mixed precipitation structure containing theβprecipitate band provides a 35%higher strengthening contribution than the typical homogeneously distributed precipi-tates.The formation of precipitation-free zones(PFZs)ensures that aging will not cause a dramatic de-crease in ductility,which provides a reference for the industrial preparation of high-performance wrought Mg-Gd series alloys.

关 键 词：Mg-Gd-Y-Zr-Ag alloy Multidirectional forging Deformation mechanism Aging behavior high strength 

分 类 号：TG139[一般工业技术—材料科学与工程]