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Liquid metal embrittlement mechanism

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【Author】 ZHOU Guohui , LIU Xiaomin , WAN FarongQIAO Lijie , CHU Wuyang ,(Department of Materials Physics, University of Science and Technology Beijing, Beijing 100083, China)ZHANG Wenqing , CHEN Nanxian(Institute of Applied Physics, University of Science and Technology Beijing, Beijing 100083, China)and ZHOU Fuxin(Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China)

【机构】 Department of Materials Physics； University of Science and Technology Beijing； Institute of Applied Physics； Institute of Mechanics； Chinese Academy of Sciences Beijing 100083； China； Beijing 100083； Beijing 100080； China；

【摘要】 <正> Liquid metal embrittlement was studied in the following two aspects. First the first principle and ChenNanxian three-dimensional lattice reverse method were employed to obtain the effective potentials for Al-Ga and GaGa. Then with the molecular dynamics simulation, the influence of liquid metal adsorption on dislocation emission was studied. The simulated result shows that after Ga atoms are adsorbed on the crack plane in Al crystal, the critical stress intensity factor decreases, which changes from 0.5 MPam^1/2 （without adsorption） to 0.4 MPam^1/2 （with adsorption）. The reason for the reduction in the critical intensity stress factor is that Ga adsorption reduces the surface energy of the crack plane. Moreover, 7075 Al alloy adsorbing liquid metal （Hg+3atm％Ga） was in-situ studied in TEM by using a special constant deflection device. The experimental result showed that liquid metal adsorption could facilitate emission, multiplication and motion of dislocations. When this process reached a critical更多还原

【Abstract】 Liquid metal embrittlement was studied in the following two aspects. First the first principle and Chen-Nanxian three-dimensional lattice reverse method were employed to obtain the effective potentials for Al-Ga and Ga-Ga. Then with the molecular dynamics simulation, the influence of liquid metal adsorption on dislocation emission was studied. The simulated result shows that after Ga atoms are adsorbed on the crack plane in Al crystal, the critical stress intensity factor decreases, which changes from 0. 5 MPam1/2 (without adsorption) to 0.4 MPam1/2 (with adsorption) . The reason for the reduction in the critical intensity stress factor is that Ga adsorption reduces the surface energy of the crack plane. Moreover, 7075 Al alloy adsorbing liquid metal (Hg + 3atm%Ga) was in-situ studied in TEM by using a special constant deflection device. The experimental result showed that liquid metal adsorption could facilitate emission, multiplication and motion of dislocations. When this process reached a critical condition, the brittle micro-crack was initiated and propagated from the crack tip or in a dislocation free zone.更多还原

【关键词】 molecular dynamics； stress intensity factor； Ga； liquid metal embrittlement； TEM； 7075 Al alloy.；
【Key words】 molecular dynamics； stress intensity factor； Ga； liquid metal embrittlement； TEM； 7075 Al alloy.；

【基金】 Proiect supported by the National Natural Science Foundation of China (Grant Nos. 59725104, 19891180, and 59671042).

【文献出处】 Science in China(Series E:Technological Sciences) ,中国科学(E辑:技术科学)(英文版) , 编辑部邮箱 ,1999年02期

【分类号】TG111
【下载频次】75

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