| Ni3Al合金硼原子占位及晶界偏聚 |
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| 引用本文： | 李卫民,张迎九,唐仁正,谢佑卿.Ni3Al合金硼原子占位及晶界偏聚[J].材料研究学报,1996,10(5):497-500. |
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| 作者姓名： | 李卫民 张迎九 唐仁正 谢佑卿 |
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| 作者单位： | 广东工业大学，中南工业大学 |
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| 摘 要： | 依据ＬＩ２型金属间化合物八面体，四面体间隙的特点，并利用硬球模型计算了上述各类间隙的空球半径大小，发现Ｎｉ３Ａｌ合金中６Ｎｉ八面体间空球半径比其他间隙大，使硼原子在更易进入６Ｎｉ八间隙，由于富Ｎｉ－Ｎｉ３Ａｌ合金晶界比Ａｌ－Ｎｉ３Ａｌ合金有更我的６Ｎｉ八面体间隙，所以硼在富Ｎｉ－Ｎｉ３Ａｌ晶界偏聚较多，另外富Ａｌ－Ｎｉ３Ａｌ合金晶界原子间作用力比富Ｎｉ－Ｎｉ３Ａｌ合金晶界原子间作用力大，这也阻碍了
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| 关 键 词： | 原子占位 晶界偏聚 硬球模型 镍铝合金 |
| 收稿时间： | 1996-10-25 |
| 修稿时间： | 1996-10-25 |
BORON OCCUPATION IN Ni_3Al ALLOY AND ITS SEGREGATION IN GRAIN BOUNDARY |
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| LI Weiming, ZHANG Yingjiu, TANG Renzhang, XIE Youqing.BORON OCCUPATION IN Ni_3Al ALLOY AND ITS SEGREGATION IN GRAIN BOUNDARY[J].Chinese Journal of Materials Research,1996,10(5):497-500. |
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| Authors: | LI Weiming ZHANG Yingjiu TANG Renzhang XIE Youqing |
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| Affiliation: | LI Weiming; ZHANG Yingjiu; TANG Renzhang; XIE Youqing(Guang dong University of Technology)(Central South University of Technology) |
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| Abstract: | According to the charateristic of tetrahedral and octahedral interstices in Ll2 intermetallic compound, the radii of those interstices have been calculated by the hard sphere model. It was found that in Ni3Al alloys, the 6Ni octahedral interstices in Ni-rich grain boundaries are large than that in Al-rich Ni3Al alloys. So a large amount of boron segregates in Ni-rich grain boundaries. Moreover,the interaction of atoms in Al-rich grain boundaries is stnonger than that in Ni-rich grain boundaries,which also prevents boron at oms from entering Al-rich grain boundaries. |
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| Keywords: | Ni_3Al atom occupancy segregation at grain boundary hard sphere model |
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