18R-LPSO相的体积分数对Mg-Zn-Y合金腐蚀行为与机理的影响  

Effect of volume fraction of 18R-LPSO phase on corrosion resistance of Mg-Zn-Y alloys

作　　者：席国强 牟宇 麻彦龙[1] 赵旭晗 熊菊 马凯 王敬丰[2] Guo-qiang XI;Yu MOU;Yan-long MA;Xu-han ZHAO;Ju XIONG;Kai MA;Jing-feng WANG(College of Material Science and Engineering,Chongqing University of Technology,Chongqing 400054,China;College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆理工大学材料科学与工程学院,重庆400054 [2]重庆大学材料科学与工程学院,重庆400044

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第2期454-466,共13页中国有色金属学报（英文版）

基　　金：supported by Chongqing Talent Plan:Leading Talents in Innovation and Entrepreneurship,China(No.CQYC201903051);University Innovation Research Group of Chongqing,China(No.CXQT20023);Qingnian Project of Science and Technology Research Program of Chongqing Municipal Education Commission,China(No.KJQN202001106);China Postdoctoral Science Foundation(No.2021M700556);Natural Science Foundation of Chongqing,China(No.cstc2021jcyj-bsh X0114);Natural Science Foundation of China(Nos.U20A20234,51874062);Chongqing Foundation and Advanced Research Project,China(No.cstc2019jcyj-zdxm X0010)。

摘　　要：通过实验设计阐明LPSO相对镁合金腐蚀行为的影响。按照形成18R-LPSO相的最小结构单元,即Zn/Y=3/4(摩尔比),设计4种不同LPSO相体积分数的Mg-Zn-Y合金,对比研究4种合金的显微组织和腐蚀行为。结果表明,合金主要含有α-Mg和18R-LPSO相,18R-LPSO相的体积分数随着Zn和Y含量的增加而增加。4种合金中18R-LPSO相的体积分数依次为16.55%、34.45%、54.24%和70.36%,18R-LPSO相的空间分布也由离散块状变为连续网络状。当LPSO相的体积分数在50%左右时,合金的耐蚀性最好,体积分数大于或小于50%都会导致合金耐蚀性能降低。This study aims to elucidate the effect of LPSO phases on the corrosion behavior of magnesium alloys through experimental design.The microstructure and corrosion behavior of four Mg-Zn-Y alloys designed according to the minimum structural unit for forming the 18R-LPSO phase,i.e.Zn/Y=3/4(molar ratio),were studied in a comparative manner.The results showed that the alloys mainly containedα-Mg and 18R-LPSO phases,and the volume fraction of the 18R-LPSO phase increased with the increase of Zn and Y contents.The volume fraction of the 18R-LPSO phase in the four alloys was,in sequence,16.55%,34.45%,54.24%and 70.36%,and the spatial distribution of the 18R-LPSO phase also changed from discrete blocks to continuous networks.When the volume fraction was about 50%,the corrosion resistance of the alloy was the best.When the volume fraction was greater than or less than 50%,the corrosion resistance of the alloy decreased.

关 键 词：MG-ZN-Y合金 18R-LPSO相 体积分数 耐腐蚀性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]