| Al-La合金不连续枝晶组织形成机理 |
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| 引用本文： | 郑亚虹,王自东,董晓娟. Al-La合金不连续枝晶组织形成机理[J]. 北京科技大学学报, 2009, 31(9) |
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| 作者姓名： | 郑亚虹 王自东 董晓娟 |
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| 作者单位： | 1. 北京科技大学材料科学与工程学院,北京,100083;无锡市广播电视大学,无锡,214011
2. 北京科技大学材料科学与工程学院,北京,100083 |
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| 基金项目： | 国家重点基础研究发展计划资助项目(No.2006CB605200) |
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| 摘 要： | 在Al-La合金的自由凝固试样中,发现Al-35%La合金组织形貌的特殊性,其先结晶相Al11La3枝晶沿主干方向成分是不连续的. 为验证这种组织存在的真实性,采用定向凝固方法制备了不同冷却速度下的Al-35%La合金试样,结果显示出定向凝固Al-35%La合金中Al11La3枝晶沿主干方向成分是不连续的. 在此基础上,分析了化学成分与凝固速度对Al-La合金组织的影响,并初步探讨了这种不连续枝晶的形成机理.
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| 关 键 词： | 二元合金 铝 镧 凝固 定向凝固 枝晶组织 |
Formation mechanism of the discontinuous dendrite structure in Al-La alloys |
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| ZHENG Ya-hong,),WANG Zi-dong),DONG Xiao-juan)) School of Materials Science , Engineering,University of Science , Technology Beijing,Beijing ,China) Wuxi Radio , Television University,Wuxi ,China. Formation mechanism of the discontinuous dendrite structure in Al-La alloys[J]. Journal of University of Science and Technology Beijing, 2009, 31(9) |
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| Authors: | ZHENG Ya-hong ) WANG Zi-dong) DONG Xiao-juan)) School of Materials Science Engineering University of Science Technology Beijing Beijing China) Wuxi Radio Television University Wuxi China |
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| Affiliation: | ZHENG Ya-hong1,2),WANG Zi-dong1),DONG Xiao-juan1)1) School of Materials Science , Engineering,University of Science , Technology Beijing,Beijing 100083,China2) Wuxi Radio , Television University,Wuxi 214011,China |
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| Abstract: | Al-La alloy samples with different compositions were prepared by a free solidification method.The results show that the dendrite structure of Al11La3 in an Al-35%La alloy is discontinuous.For demonstrating the authenticity of this structure,adopting a directional solidification method,Al-35%La alloy samples were prepared at different solidification rates.It is indicated that the dendrite structure of Al11La3 in the Al-35%La alloy obtained by directional solidification is discontinuous.The effects of composi... |
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| Keywords: | binary alloys aluminum lanthanum solidification directional solidification dendrite structure |
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