孪晶界第二相析出对AZ80镁合金板材弯曲变形行为的影响  

Effect of Second Phase Precipitation at Twin Boundary on Bending Deformation Behavior of AZ80 Magnesium Alloy Sheet

作　　者：张征勇 任开志 赵振铎[2] 王利飞[1] ZHANG Zhengyong;REN Kaizhi;ZHAO Zhenduo;WANG Lifei(School of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Technology Center,Shanxi Taigang Stainless Steel Co.,Ltd.,Taiyuan 030003,China)

机构地区：[1]太原理工大学材料科学与工程学院,山西太原030024 [2]山西太钢不锈钢股份有限公司技术中心,山西太原030003

出　　处：《热加工工艺》2023年第24期157-159,164,共4页Hot Working Technology

基　　金：国家自然科学青年基金项目(51704209);山西省重点研修计划项目(201803D421086);山西省2020年度省级专利推广实施资助专项项目(20200718);山西省高等学校科技创新项目(201802034);山西省自然科学基金项目(2016021063);山西省留学归国人员择优资助项目(2017014)。

摘　　要：采用光学显微镜(OM)、扫描电镜(SEM)研究了室温预置拉伸孪晶后时效处理对AZ80镁合金第二相的析出和弯曲变形行为的影响。结果表明,在180℃时效0.5 h可明显促进第二相粒子在晶界处的析出,增加孪晶界亦可促进第二相的析出。预置孪晶后进行反向拉伸,AZ80镁合金组织发生去孪生行为,组织中孪晶数量减少。由于去孪生行为的产生,拉伸屈服强度降低。将预置孪晶的试样在100℃弯曲变形后,弯曲试样外侧发生拉伸去孪生行为,内侧组织因为压缩载荷的作用孪晶数量增加,中部呈孪晶数量由多变少的过渡现象。第二相粒子增多会抑制去孪生行为的产生。The effects of aging treatment after pre-twinning on the precipitation and bending deformation behavior at room temperature of AZ80 magnesium alloy were studied by optical microscope(OM)and scanning electron microscope(SEM).The results show that aging at 180℃ for 0.5 h can significantly promote the precipitation at grain boundary,and the addition of twins boundary can also promote the precipitation.When the precompressed-samples are stretch in reverse after pre-twining,the number of twins in AZ80 magnesium alloy structure is decreased because of detwinning.The tensile yield strength is reduced due to detwinning.After bending the pre-twinning specimen at 100℃,the tensile debonding behavior occurs on the outside of the bending specimen.Due to the compression load,the number of twins in the inner structure increases,while the number of twins in the middle changes from variable to less.The increase of the second phase particles inhibits the generation of detwinning behavior.

关 键 词：AZ80镁合金 预置孪晶 第二相 弯曲 

分 类 号：TG166.4[金属学及工艺—热处理]