等通道转角挤压对Mg-1Gd、Mg-2Zn二元合金组织及力学性能的影响  

Effect of Equal-Channel Angular Extrusion on Microstructure and Mechanical Properties of Mg-1Gd and Mg-2Zn Alloys

作　　者：许金良 宋宜帆 丁睿智 闫宏 陈荣石[2] Xu Jinliang;Song Yifan;Ding Ruizhi;Yan Hong;Chen Rongshi(School of Materials Science and Engineering,Shandong University of Science and Technology,Qingdao 266400,China;Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]山东科技大学材料科学与工程学院,山东青岛266400 [2]中国科学院金属研究所师昌绪先进材料创新中心,辽宁沈阳110016

出　　处：《稀有金属材料与工程》2024年第6期1735-1740,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(52271107);山东省自然科学基金(ZR2021ME241)。

摘　　要：使用OM、EBSD等手段研究了等通道转角挤压(ECAE)对Mg-1Gd、Mg-2Zn2种二元合金组织和力学性能的影响。结果表明,在相同挤压条件下,Mg-2Zn合金发生完全再结晶,晶粒长大粗化,且强度塑性不随着挤压道次变化;Mg-1Gd合金则只发生了部分动态再结晶,组织为细小的动态再结晶晶粒和变形晶粒,伴随挤压道次的增加,再结晶程度提升,合金的抗拉强度与塑性增加了1倍。这与溶质原子Gd比Zn更能抑制再结晶和晶粒长大有关。Mg-1Gd合金的再结晶晶粒的取向分散,而未再结晶的晶粒c轴取向由ED向TD偏转45°,这与宏观织构的检测相互印证,晶粒内部产生大量的小角度晶界,小角度晶界两侧发生围绕c轴的转动。The effects of equal-channel angular extrusion on the microstructure and mechanical properties of two binary alloys,Mg-1Gd and Mg-2Zn were studied by OM and EBSD.The results show that under the same extrusion conditions,Mg-2Zn alloy fully recrystallizes,resulting in grain growth and coarsening,and the strength and plasticity do not change with the number of extrusion passes.Mg-1Gd alloy only partially recrystallizes after extrusion,with a microstructure consisting of fine dynamic recrystallized grains and deformed grains.With the increase in the number of extrusion passes,the degree of recrystallization increases,leading to a doubling of the tensile strength and plasticity of Mg-1Gd alloy.This is related to the greater inhibition of recrystallization and grain growth by the solute atom Gd compared to Zn.The recrystallized grains have a dispersed orientation,while the grains that do not recrystallize in Mg-1Gd alloy have a c-axis orientation that deviates 45°from ED to TD,which is consistent with the detection of macroscopic texture.A large number of small-angle grain boundaries form within the grains,and rotations around the c-axis occur on both sides of these boundaries,gradually evolving into large-angle boundaries.

关 键 词：等通道转角挤压(ECAE) Mg-1Gd合金 Mg-2Zn合金 再结晶 织构 力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]