热轧变形量对Mg_(97)Ni_(1)Y_(2)合金组织和力学性能的影响  

Effect of Hot Rolling Deformation on Microstructure and Mechanical Properties of Mg_(97)Ni_1Y_(2) Alloy

作　　者：董栋 周裕城 李谦 DONG Dong;ZHOU Yucheng;LI Qian(Materials Genome Institute,Shanghai University,Shanghai 200444,China;College of Materials Science and Engineering,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学材料基因组工程研究院,上海200444 [2]上海大学材料科学与工程学院,上海200444

出　　处：《热加工工艺》2023年第17期83-88,共6页Hot Working Technology

基　　金：国家自然科学基金资助项目(51671118);上海市科委部分地方院校能力建设专项计划项目(19010500400)。

摘　　要：热塑性变形可有效提高含长周期堆垛有序(LPSO)相Mg-Ni-Y合金的力学性能。采用扫描电镜、电子背散射衍射和拉伸试验,研究了热轧变形量对Mg_(97)Ni_(1)Y_(2)合金显微组织和力学性能的影响。结果表明,LPSO相在热轧过程中发生了扭折变形,随着热轧变形量从40%提高到70%,LPSO相扭折变形角度从11°增加到了29°,并且出现了部分断裂。此外,合金在70%的变形量下获得了尺寸细小的动态再结晶晶粒。在LPSO相扭折强化、细晶强化和弥散强化的共同作用下,合金的强度随热轧变形量的增加而提高,热轧变形量最大(70%)的合金获得了最高的强度:屈服强度达到了276 MPa,抗拉强度达到了358 MPa。The hot plastic deformation can effectively improve the mechanical properties of Mg-Ni-Y alloys containing the long-period stacking-order (LPSO) phase.The effects of hot-rolling deformation on the microstructure and mechanical properties of Mg_(97)Ni_1Y_(2) alloy were studied by scanning electron microscopy,electron backscattering diffraction and tensile testing.The results show that the LPSO phase is distorted during the hot-rolling.As the hot rolling deformation amount increases from 40% to 70%,the angle of the LPSO distortion increases from 11° to 39°,and some of the LPSO fracture.In addition,dynamic recrystallization occurs at the deformation of 70%,thereby leading to more refined grains.Under the joint action of LPSO phase twist strengthening,fine grain strengthening and dispersion strengthening,the strength of the alloy increases with the increase of hot-rolling deformation.The alloy with the largest deformation (70%) reaches the highest strength:yield strength and tensile strength up to 276 MPa and 358 MPa,respectively.

关 键 词：Mg-Ni-Y合金 热轧 LPSO相 显微组织 力学性能 

分 类 号：TG335.5[金属学及工艺—金属压力加工]