袁光宇,游国强,宰乐,童鑫,李卫荣,龙思远.Cu、Zn对Mg晶粒尺寸以及微观组织影响[J].稀有金属材料与工程,2021,50(1):201~211.[Yuan Guangyu,You Guoqiang,Zai Le,Tong Xin,Li Weirong,Long Siyuan.Effects of Cu and/or Zn addition on the grain size and microstructure of Mg[J].Rare Metal Materials and Engineering,2021,50(1):201~211.]
Cu、Zn对Mg晶粒尺寸以及微观组织影响
投稿时间:2020-01-20  修订日期:2020-07-03
中文关键词:  Mg合金  Cu、Zn元素  晶粒细化  溶质效应  第二相
基金项目:国家重点研发项目(No. 2016YFB0301100);东莞市核心技术攻关重点项目(No. 2019622134013);重庆市重点研发项目(No. cxtc2019jscx-fxydX0044)
中文摘要:
      通过向镁熔体中单独和复合添加一定量的Cu及Zn元素,探究了Cu、Zn对镁晶粒尺寸和微观组织的影响并阐释了其细化机理;同时深入表征了Cu、Zn单独及复合添加后合金的物相组成。结果表明:向纯Mg中加入Cu、Zn和Cu、Zn复合添加后,晶粒依次由柱状晶转变为等轴晶。单独加Cu、单独加Zn和Cu、Zn复合添加后,平均晶粒尺寸由纯Mg的1270μm分别减小至470、120和85μm。单独加Zn对Mg的晶粒细化机理主要为Zn元素的溶质效应;单独加Cu对Mg的晶粒细化机理主要为Cu元素的溶质效应和CuMg2相对晶界的钉扎作用;Cu、Zn复合添加后细化效果更好主要是因为Cu、Zn元素的复合溶质效应及第二相对晶界的钉扎作用更为强烈。此外,单独加Zn后,第二相呈颗粒状分布于基体中,合金中的物相组成为α-Mg+MgZn;单独加Cu后,第二相形貌呈网状,合金中的物相组成为α-Mg+CuMg2;Cu、Zn复合添加后,Mg-5Cu-3Zn晶界上的第二相呈现出两种不同的形貌,经鉴定,连续的块状第二相为CuMg2相,不连续的鱼骨状第二相为CuMgZn相。
Effects of Cu and/or Zn addition on the grain size and microstructure of Mg
英文关键词:Magnesium alloy  Cu, Zn element, grain refinement  Effect of the solute  secondary phase
英文摘要:
      The different Mg alloys before and after Cu and/or Zn addition were used as the experimental material. The effects of Cu and/or Zn addition on the microstructures and grain sizes of Mg alloys were firstly discussed and the mechanism of grain refinement after Cu and/or Zn addition was explained. What’more, the phase compositions of different Mg alloys before and after Cu and/or Zn addition were revealed. The results show that after Zn, Cu and Cu+Zn addition in the pure Mg, the grain sizes of the alloys decreased from 1270μm (pure Mg) to 470μm, 120μm and 85μm, respectively and the crystal morphology changed from columnar grain to equiaxed grain. The Cu and Zn addition had the best grain refinement effect on pure Mg, then the Cu addition followed and the Zn addition was the worst. After Zn addition, Mg-3Zn alloy was composed of α-Mg and MgZn phases. The secondary phases were mainly in the morphology of tiny particles. After Cu addition, Mg-5Cu alloy was composed of α-Mg and CuMg2 phases. The secondary phases were mainly in the morphology of discontinuous herringbone structure. After Cu and Zn addition, Mg-5Cu-3Zn alloy was composed of α-Mg, CuMg2 and CuMgZn phases. It was found that CuMg2 phases were in the shape of continuous bulk and the CuMgZn phases were in the in the morphology of discontinuous herringbone structure. The grain refinement of Zn addition on pure Mg was mainly due to the effect of solute Zn element. And the mechanism of the grain refinement of Cu addition was the effect of solute Cu element and pinning effect of CuMg2 phases on the grain boundaries of α-Mg. However, after Cu and Zn addition, the grain size was finer than Mg-3Zn and Mg-5Cu alloys. This was mainly due to composite solute effect of Cu and Zn element and stronger pinning effect of the secondary phases.
作者单位E-mail
袁光宇 重庆大学材料科学与工程学院 412815560@qq.com 
游国强 重庆大学材料科学与工程学院 ygq@cqu.edu.cn 
宰乐 重庆大学材料科学与工程学院 lezai@cqu.edu.cn 
童鑫 重庆大学材料科学与工程学院  
李卫荣 东莞宜安科技股份有限公司 liwr@e-ande.com 
龙思远 重庆大学材料科学与工程学院 siyuan_long@cqu.edu.cn 
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