| Zr在Mg-9Gd-4Y合金中的晶粒细化机制 |
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| 引用本文： | 彭卓凯,张新明,陈健美,蒋浩,肖阳.Zr在Mg-9Gd-4Y合金中的晶粒细化机制[J].北京科技大学学报,2006,28(2):148-152. |
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| 作者姓名： | 彭卓凯 张新明 陈健美 蒋浩 肖阳 |
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| 作者单位： | 中南大学材料科学与工程学院,长沙,410083 |
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| 基金项目： | 国防预研基金
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高比容电子铝箔的研究开发与应用项目
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浙江省湖州市自然科学基金 |
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| 摘 要： | 研究了不同Zr含量对Mg-9Gd-4Y合金晶粒大小的影响及Zr的晶粒细化机制.结果表明,Zr可以明显细化合金的晶粒,且随Zr含量增加,晶粒变得更细小.微观组织分析表明,在Zr含量较高的合金中,几乎每个晶粒内都含有至少一个富Zr的核;而在Zr含量较低的合金中没有发现这种核.在高Zr含量和低Zr含量的合金中,晶粒细化的机制不同:在低Zr含量合金中,Zr以抑制晶粒长大为主;在高Zr含量合金中,Zr以促进异质形核为主.
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| 关 键 词： | Mg-Gd-Y合金 Zr 晶粒细化 细化机理 合金 晶粒细化机制 alloys zirconium mechanism refinement 异质形核 抑制晶粒长大 发现 分析表 微观组织 含量增加 结果 影响 晶粒大小 研究 |
| 收稿时间： | 2005-01-12 |
| 修稿时间： | 2005-09-20 |
Grain refinement mechanism of zirconium in the Mg-9Gd-4Y alloys |
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| PENG Zhuokai,ZHANG Xinming,CHEN Jianmei,JIANG Hao,XIAO Yang.Grain refinement mechanism of zirconium in the Mg-9Gd-4Y alloys[J].Journal of University of Science and Technology Beijing,2006,28(2):148-152. |
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| Authors: | PENG Zhuokai ZHANG Xinming CHEN Jianmei JIANG Hao XIAO Yang |
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| Institution: | School of Materials Science and Engineering, Central South University, Changsha 410083, China |
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| Abstract: | The effect of Zr content on the grain size of Mg-9Gd-4Y alloys and the grain refinement mechanism of Zr were investigated.The results reveal that Zr can refine grains of the alloys greatly,and the grains become finer with the increase of Zr content.The microstructure analysis shows that there are at least one Zr-rich core in the almost each grain in the alloys with high Zr content,whereas the characteristic Zr-rich cores are not found in the alloy with low Zr content.It is suggested that the grain refinement mech- anism of zirconium in the low Zr alloys be different from that in the high Zr alloys:the zirconium works mainly by restricting grain growth in the low Zr alloys,and by generating nucleants in the high Zr alloys. |
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| Keywords: | Mg-Gd-Y alloy Zr grain refinement grain refining mechanism |
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