| 铝氢脆破坏微观机制的分子动力学研究 |
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| 引用本文： | 沈海军,付光俊.铝氢脆破坏微观机制的分子动力学研究[J].强度与环境,2010,37(4):22-27. |
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| 作者姓名： | 沈海军 付光俊 |
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| 作者单位： | 同济大学航空与力学学院,上海,200092 |
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| 摘 要： | 采用分子动力学方法模拟了铝单晶、双晶及其含氢模型在拉伸条件下的力学特性。根据模拟结果,讨论了氢导致铝材料脆化破坏的微观机理。研究表明:铝单晶、双晶中的氢降低了铝的抗拉强度,且力学性能随氢含量的升高而降低;应力条件下晶体内部的氢原子会产生偏聚和富集,在富集处铝原子更易发生位错,产生空穴,诱发脆断;和同等条件下的铝单晶相比,铝双晶对氢脆破坏更为敏感。
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| 关 键 词： | 分子动力学 铝单晶 双晶 氢脆破坏 抗拉强度 |
The MD simulation of hydrogen embrittlement fracture for aluminum |
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| Shen Haijun,Fu Guangjun.The MD simulation of hydrogen embrittlement fracture for aluminum[J].Structure & Environment Engineering,2010,37(4):22-27. |
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| Authors: | Shen Haijun Fu Guangjun |
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| Institution: | Shen Haijun Fu Guangjun(School of Aeronautics and Mechanics,Tongji university,Shanghai 200092,China) |
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| Abstract: | The MD（Molecular dynamics） method is used to investigate the HE（Hydrogen Embrittlement） fracture of single-crystal and twin-crystal aluminum under tension.According to the simulative results,the HE fracture mechanism of aluminum is discussed.It is shows that hydrogen decreases the tensile strength of crystal aluminum,and the mechanical properties decreases with the increase of hydrogen amount;in the crystal aluminum under tension the segregation and concentration of hydrogen atoms occur and conduce some holes,further the embrittlement fracture of aluminum;the twin-crystal aluminum is more susceptible to HE fracture than single-crystal one. |
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| Keywords: | MD single-crystal twin-crystal HE fracture tensile strength |
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