| 液体金属吸附促进位错发射的分子动力学研究 |
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| 引用本文： | 周国辉,周富信,万发荣,褚武扬.液体金属吸附促进位错发射的分子动力学研究[J].力学学报,2000,32(3):272-279. |
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| 作者姓名： | 周国辉 周富信 万发荣 褚武扬 |
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| 作者单位： | 1. 北京科技大学材料物理系,北京,100083
2. 中国科学院力学研究所非线性连续介质力学开放研究实验室,北京,100080 |
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| 基金项目： | 国家重点基础研究专项经费!（G19900065），国家自然科学基金!（19891180） |
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| 摘 要： | 用第一原理算出Ｒｏｓｅ方程中的参量后，利用陈氏反演原理可以求出Ａｌ－Ｇａ和Ｃｕ－Ｇａ的对势；从而可研究Ａｌ和Ｃｉ裂纹表面吸附液体金属Ｇａ之后对裂尖发射位错的影响。结果表明，Ａｌ吸附Ｇａ后可使发射们错的临界应力强度因子从ＫＩｅ＝０．５ＭＰａｍ＾１／２，降为ＫＩｅ（Ｌ）＝０．４ＭＰａｍ＾１／２；对Ｃｕ则从ＫＩｅ＝０．５５ＭＰａｍ＾１／２降为ＫＩｅ（Ｌ）＝０．４５ＭＰａｍ＾１／２，即Ｇａ吸附后能促进位错
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| 关 键 词： | 液体金属脆 分子动力学模拟 位错发射 镓 铝 |
MOLECULAR DYNAMICS STUDY OF THE INFLUENCE OF LIQUID METAL ABSORPTION ON DISLOCATION EMISSION |
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| Zhou Guohui,Zhou Fuxin,Wan Farong,Chu Wuyang.MOLECULAR DYNAMICS STUDY OF THE INFLUENCE OF LIQUID METAL ABSORPTION ON DISLOCATION EMISSION[J].chinese journal of theoretical and applied mechanics,2000,32(3):272-279. |
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| Authors: | Zhou Guohui Zhou Fuxin Wan Farong Chu Wuyang |
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| Abstract: | The pair potential of Al-Ga and Cu-Ga have been calculated by Chen's reverse method with the parameters in Rose's equation and the first principle theory. The effect on dislocation emission from crack tip is studied when liquid metal Ga is adsorbed on the crack plane of metal Al or Cu. The results show that for Al the critical stress intensity for dislocation emission would decrease from K_(Ie)=0.5 MPam1/2 to K_(Ie)(L)=0.4 MPam~(1/2) due to the adsorption of Ga, and for Cu from K_(Ie)=0.55MPam_(1/2) to K_(Ie)(L)=0.45MPam~(1/2). It means that the adsorption of liquid metal would facilitate the dislocation emission. On the other hand, vacancy cluster and Frank dislocation would form easily ahead of the crack tip due to the adsorption of liquid Ga. |
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| Keywords: | embrittlement of liquid metal molecular dynamics simulation Ga Al |
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