| Gd和Y偏析对Mg-9Gd-4Y-0.6Zr和Mg-7Gd-4Y-0.6Zr合金组织性能的影响 |
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| 引用本文： | 肖阳,张新明,蒋浩,陈部湘.Gd和Y偏析对Mg-9Gd-4Y-0.6Zr和Mg-7Gd-4Y-0.6Zr合金组织性能的影响[J].中南大学学报(自然科学版),2007,38(1):24-29. |
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| 作者姓名： | 肖阳 张新明 蒋浩 陈部湘 |
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| 作者单位： | 中南大学材料科学与工程学院，中南大学材料科学与工程学院，中南大学材料科学与工程学院，中南大学材料科学与工程学院 湖南长沙，410083，湖南长沙，410083，湖南长沙，410083，湖南长沙，410083 |
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| 基金项目： | 国家重点基础研究发展计划(973计划);国家高技术研究计划发展专项经费 |
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| 摘 要： | 利用光学显微镜、扫描电镜、透射电镜及能谱分析对Mg-9Gd-4Y-0．6Zr合金和Mg-7Gd-4Y-0．6Zr进行组织观察。结果表明:Gd和Y元素容易产生如枝晶偏析、晶界偏析和重力偏析等严重的局部组织缺陷:Gd元素偏析程度比Y的大,降低Gd的含量能减少合金的偏析;Mg-7Gd-4Y-0．6Zr的偏析程度比Mg-9Gd-4Y-0．6Zr的低; Mg-7Gd-4Y-0．6Zr合金经固溶处理后基本上消除偏析,并且该合金的强度损失较少,延伸率大幅度提高,这有利于提高合金的综合力学性能;Mg-9Gd-4Y-0．6Zr合金中稀土元素偏析形成的稀土粒子能塞积位错和阻碍晶界运动,是合金变形过程中形成裂纹的源头,能降低合金的塑性,并对合金的断裂产生较大影响。
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| 关 键 词： | Mg-Gd-Y-Zr合金 耐热镁稀土合金 偏析 |
| 文章编号： | 1672-7207（2007）01-0024-06 |
| 修稿时间： | 2000-04-18 |
Influence of Gd and Y elements segregation on microstructure and mechanical properties of Mg-9Gd-4Y-0.6Zr and Mg-7Gd-4Y-0.6Zr alloys |
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| XIAO Yang,ZHANG Xin-ming,JIANG Hao,CHEN Bu-xiang.Influence of Gd and Y elements segregation on microstructure and mechanical properties of Mg-9Gd-4Y-0.6Zr and Mg-7Gd-4Y-0.6Zr alloys[J].Journal of Central South University:Science and Technology,2007,38(1):24-29. |
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| Authors: | XIAO Yang ZHANG Xin-ming JIANG Hao CHEN Bu-xiang |
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| Institution: | School of Materials Science and Engineering, Central South University, Changsha 410083, China |
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| Abstract: | The microstructures of Mg-9Gd-4Y-0.6Zr and Mg-7Gd-4Y-0.6Zr alloys were investigated by optical microscopy,scanning electron microscopy,transmission electron microscopy and energy dispersion X-ray analysis.The results show that the segregation of Gd and Y elements leads to many local defects such as dendritic segregation, grain-boundary segregation and gravity segregation.The degree of Gd segregation is larger than that of Y,and it can be reduced by decreasing Gd concentration.The segregation degree of Mg-7Gd-4Y-0.6Zr is smaller than that of Mg-9Gd-4Y-0.6Zr,and it can be eliminated almost completely by solution heat treatment.The strength of Mg-7Gd-4Y-0.6Zr reduces less and the elongation of this alloy rises more,which is useful to improve the combiation mechanical properties.The particles formed by the rare earth segregation can pile-up dislocations and inhibit grain boundary morion,but these particles are sites of crack initiation,resulting in lower plasticity and exerting influence on fracture mode of the alloy. |
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| Keywords: | Mg-Gd-Y-Zr alloy heat resistant magnesium-rare earth alloy segregation |
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