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材料工程  2017, Vol. 45 Issue (3): 95-101    DOI: 10.11868/j.issn.1001-4381.2015.000136
  研究论文 本期目录 | 过刊浏览 | 高级检索 |
添加元素对Mg-3Si合金组织影响
崔斌1,2, 杨柳1,2, 邓运来1,2, 谭军1,2, 张骞1,2, 王婷1,2
1. 中南大学 材料科学与工程学院, 长沙 410083;
2. 中南大学 有色金属材料科学与工程教育部重点实验室, 长沙 410012
Effect of Adding Elements on Microstructure of Mg-3Si Alloy
CUI Bin1,2, YANG Liu1,2, DENG Yun-lai1,2, TAN Jun1,2, ZHANG Qian1,2, WANG Ting1,2
1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Nonferrous Materials Science and Engineering(Ministry of Education), Central South University, Changsha 410012, China
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摘要 采用扫描电镜、X射线衍射对合金组织进行观察,研究在Mg-3Si(质量分数/%,下同)合金陆续添加Zn,Nd,Gd,Y元素后微观组织演变规律。结果表明:Mg-3Si合金中Mg2Si粒子具有初生和共晶两种明显不同的形貌;添加3%Zn元素后的Mg-3.0Si-3.0Zn合金中,初生Mg2Si粒子粗化,共晶Mg2Si粒子完全消失;在Mg-2.0Nd-3.0Zn-3.0Si合金中,Nd元素的加入能有效地细化初生Mg2Si粒子并生成少量的Mg41Nd5粒子;继续添加Gd,Y元素后,在Mg-8.0Gd-4.0Y-2.0Nd-3.0Zn-3.0Si合金中的Gd5Si3和YSi等粒子急剧增加而Mg2Si粒子含量大大减少。通过Thermo-Calc热力学软件的热力学计算表明:Gd5Si3,YSi的吉布斯自由能低,Gd,Y原子与Si更容易形成化合物。在Mg-8Gd-4Y-2Nd-3Zn-3Si合金中,Gd5Si3,YSi,Mg2Si三种化合物的室温吉布斯自由能分别为-9.56×104,-8.72×104,-2.83×104J/mol,粒子的质量分数分别为8.07%,5.27%,1.40%。
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崔斌
杨柳
邓运来
谭军
张骞
王婷
关键词 微观组织热力学Mg2Si粒子吉布斯自由能    
Abstract:The microstructure of alloy Mg-3Si(mass fraction/%, same as below) after successive additions with different elements of Zn, Nd, Gd and Y was observed and the microstructure evolution was investigated by scanning electron microscopy and X-ray diffraction. The results show the primary Mg2Si particles co-exist with eutectic Mg2Si particles in binary alloy Mg-Si. With minor addition of Zn element, only primary Mg2Si can be found in ternary Mg-3Si-3Zn system while eutectic Mg2Si particles disappear. In quaternary alloy Mg-2.0Nd-3.0Zn-3.0Si, the addition of Nd element can effectively refine the primary Mg2Si particles and form some Mg41Nd5 particles. After continuous adding of Gd and Y elements into quaternary system, Gd5Si3 and YSi particles increase significantly in the alloy Mg-8.0Gd-4.0Y-2.0Nd-3.0Zn-3.0Si, while volume fraction of primary Mg2Si decrease significantly. Thermo-Calc calculation predicts that the Gibbs free energy for primary particles Gd5Si3, YSi is lower, and therefore Gd, Y atom and Si are more likely to form compounds. In Mg-8Gd-4Y-2Nd-3Zn-3Si alloy, room temperature Gibbs free energy for primary particles Mg2Si, Gd5Si3, YSi is -9.56×104, -8.72×104, -2.83×104J/mol, respectively, and the mass fraction of these particles is 8.07%, 5.27%, 1.40% respectively.
Key wordsmicrostructure    thermodynamics    Mg2Si particle    Gibbs free energy
收稿日期: 2015-01-28      出版日期: 2017-03-22
中图分类号:  TG146.2  
通讯作者: 杨柳(1983-),女,博士研究生,主要从事有色金属合金材料制备与构件成形研究,联系地址:中南大学校本部特冶楼114室邓运来转(410083),E-mail:yangliu831121@sina.com     E-mail: yangliu831121@sina.com
引用本文:   
崔斌, 杨柳, 邓运来, 谭军, 张骞, 王婷. 添加元素对Mg-3Si合金组织影响[J]. 材料工程, 2017, 45(3): 95-101.
CUI Bin, YANG Liu, DENG Yun-lai, TAN Jun, ZHANG Qian, WANG Ting. Effect of Adding Elements on Microstructure of Mg-3Si Alloy. Journal of Materials Engineering, 2017, 45(3): 95-101.
链接本文:  
http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2015.000136      或      http://jme.biam.ac.cn/CN/Y2017/V45/I3/95
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