Gd对挤压镁合金AZ91组织和氢脆的影响  

Effect of Gd on microstructure and hydrogen embrittlement of AZ91-extruded magnesium alloy

作　　者：宋雨来[1,2] 李伟光 张林阳 宋庆军 张华 李军 刘庆 SONG Yu-lai;LI Wei-guang;ZHANG Lin-yang;SONG Qing-jun;ZHANG Hua;LI Jun;LIU Qing(Key Laboratory of Automobile Materials,Ministry of Education,Jilin University,Changchun 130022,China;College of Materials Science and Engineering,Jilin University,Changchun 130022,China;Metal Materials Department of Materials&lightweight Institute,General R&D Institute,China FAW Co.,Ltd.,Changchun 130011,China)

机构地区：[1]吉林大学汽车材料教育部重点实验室,长春130022 [2]吉林大学材料科学与工程学院,长春130022 [3]中国一汽研发总院材料与轻量化开发院金属材料开发部,长春130011

出　　处：《吉林大学学报（工学版）》2024年第10期2792-2798,共7页Journal of Jilin University:Engineering and Technology Edition

基　　金：吉林省重大科技项目(20210301025GX)。

摘　　要：采用挤压法制备了AZ91和AZ91-xGd(x=0.5、1.0、1.5)镁合金。采用扫描电镜、电化学氧化法、慢应变速率拉伸法,研究了挤压镁合金AZ91和AZ91-xGd的微观组织、充氢及氢脆行为。结果表明:随着Gd的加入,AZ91中的β-Mg_(17)Al_(12)尺寸减小,数量减少,分布均匀。在相同的充氢条件下,随着稀土Gd含量的增加,挤压镁合金AZ91中的氢浓度逐渐降低,在一定程度上解决了氢在合金中的偏聚问题,使氢脆敏感性大大降低,有效提升了抗氢脆性能。AZ91 and Az91-x Gd(x=0.5,1.0,1.5)magnesium alloys were prepared by extrusion method.The microstructures,hydrogen charging and hydrogen embrittlement behavior of AZ91 and Az91-x Gd alloys were studied by scanning electron microscopy,electrochemical oxidation and slow strain rate tensile methods.The results show that with the addition of Gd,the size and quantity of β-Mg_(17)Al_(12)in AZ91 decrease,and the distribution is uniform.Under the same hydrogen-charged conditions,with the increase of rare earth Gd content,the hydrogen concentration in extruded magnesium alloy AZ91 gradually decreases,which solves the problem of partial polymerization of hydrogen in the alloy to a certain extent,greatly reduces the hydrogen embrittlement susceptibility,and effectively improves the hydrogen embrittlement resistance.

关 键 词：材料加工工程 镁合金 钆 氢脆 

分 类 号：TG146.22[一般工业技术—材料科学与工程]