| Ni3Al中B和Mg的非平衡晶界共偏聚 |
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| 引用本文： | 胡静,张云,林栋梁.Ni3Al中B和Mg的非平衡晶界共偏聚[J].金属学报,2002,38(8):829-834. |
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| 作者姓名： | 胡静 张云 林栋梁 |
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| 作者单位： | 1. 上海交通大学材料科学及工程学院,上海,200030;江苏石油化工学院机械工程系,常州,213016
2. 上海交通大学材料科学及工程学院,上海,200030 |
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| 基金项目： | 国家自然科学基金资助项目 59895150 |
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| 摘 要： | 在1023－1373K的初始温度和0.05-268.91K/s的冷速范围内，用Auger剖层分析确定含B和Mg的Ni3Al合金中B和Mg的非平衡晶界共偏聚行为，按照溶质－空位复合体迁移机制所导出的描述非平衡晶界偏聚的扩散速率方程解析表达式，很好地模拟了本实验结果，并确定了Ni3Al-B-Mg合金中B及B－空位复合体，Mg及Mg-空位复合体的扩散系数及复合体激活能。
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| 关 键 词： | 晶界共偏聚 非平衡偏聚 硼 镁 金属间化合物 Ni3Al |
| 文章编号： | 0412-1961(2002)08-0829-06 |
| 修稿时间： | 2001年11月19 |
NON-EQUILIBRIUM GRAIN BOUNDARY CO-SEGREGA TION OF BORON AND MAGNESIUM IN Ni3Al |
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| HU Jing,ZHANG Yun,LIN Dongliang School of Materials Science and Engineering,Shanghai Jiaotong University,Shanghai.NON-EQUILIBRIUM GRAIN BOUNDARY CO-SEGREGA TION OF BORON AND MAGNESIUM IN Ni3Al[J].Acta Metallurgica Sinica,2002,38(8):829-834. |
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| Authors: | HU Jing ZHANG Yun LIN Dongliang School of Materials Science and Engineering Shanghai Jiaotong University Shanghai |
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| Affiliation: | HU Jing1,2),ZHANG Yun1),LIN Dongliang1)1) School of Materials Science and Engineering,Shanghai Jiaotong University,Shanghai 2000302) Department of Mechanical Engineering,Jiangsu Institute of Petrochemical Technology,Changzhou 213016Correspondent: LI |
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| Abstract: | The non-equilibrium grain boundary co-segregation of boron and magnesium in Ni3Al alloys was determined by Auger electron spectroscopy (AES) in conjunction with ion sputtering in a cooling rate range of 0.05-268.91 K/s at temperatures of 1023, 1223 and 1373 K. Based on the concept of mobile solute-vacancy complexes migrating to grain boundaries the analytical expressions of diffusion rate equations describing non-equilibrium segregation process were used to simulate the experimental results. The diffusion coefficients for boron atoms, boron-vacancy complexes, magnesium atoms and magnesium-vacancy complexes were determined, and the binding energies of boron-vacancy and magnesium-vacancy complexes were estimated. |
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| Keywords: | non-equilibrium grain boundary segregation boron magnesium intermetallics Ni3Al |
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