| 纳晶金属材料氢脆的微观力学模型 |
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| 引用本文： | 吴友义,卞欢,毛彩云,王光绪,周剑秋.纳晶金属材料氢脆的微观力学模型[J].工程力学,2014,31(12):228-233. |
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| 作者姓名： | 吴友义 卞欢 毛彩云 王光绪 周剑秋 |
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| 作者单位： | 1.南京工业大学机械与动力工程学院,南京 210009;;2.武汉工程大学机电工程学院,武汉 430073 |
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| 基金项目： | 国家自然科学基金项目(10872087);教育部新世纪优秀人才支持计划项目(NCET-12-0712);霍英东青年教师基金项目(101005) |
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| 摘 要： | 针对纳晶金属材料的氢脆问题,该文提出一个新的理论模型。在该模型的理论框架内,认为堆积在距裂纹尖端最近晶界上的氢原子会阻止位错从裂纹尖端的发射,从而抑制裂纹的钝化,同时促进纳晶金属材料的脆性断裂。该文在有氢和无氢两种条件下,对纳晶镍的临界应力强度因子与晶粒尺寸之间的相互关系进行了对比。结果表明：由于氢原子的脆化作用,纳晶镍的临界应力强度因子下降30％之多,这种氢致纳晶金属材料脆化的现象随其晶粒尺寸的变小而愈加显著。
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| 关 键 词： | 纳晶金属材料 脆性断裂 位错发射 氢脆 裂纹 |
| 收稿时间： | 2013-06-15 |
| 修稿时间： | 2014-02-27 |
A MICRO-MECHANICAL MODEL OF HYDROGEN-INDUCED EMBRITTLEMENT IN NANOCRYSTALLINE METALS |
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| WU You-yi,BIAN Huan,MAO Cai-yun,WANG Guang-xu,ZHOU Jian-qiu.A MICRO-MECHANICAL MODEL OF HYDROGEN-INDUCED EMBRITTLEMENT IN NANOCRYSTALLINE METALS[J].Engineering Mechanics,2014,31(12):228-233. |
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| Authors: | WU You-yi BIAN Huan MAO Cai-yun WANG Guang-xu ZHOU Jian-qiu |
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| Affiliation: | 1.College of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 210009, China;;2.School of Mechanical and Electrical Engineering, Wuhan Institute of Technology, Wuhan 430073, China |
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| Abstract: | In this paper, a new theoretical model on hydrogen embrittlement of nanocrystalline metals is proposed, in which hydrogen atoms are assumed to accumulate in the nearest grain boundary ahead of the nanocrack tip; they prevent the emitting of dislocations from crack tip, and thus suppress nanocrack tip blunting as well as induce brittle fracture. The dependence of the critical stress intensity factor on grain size with and without hydrogen in nanocrystalline Ni is clarified and compared. The results show that the ingress of hydrogen into nanocrystalline metals results in a drop in critical stress intensity factor by more than 30% in contrast with the hydrogen free condition, and this hydrogen-induced embrittlement in nanocrystalline metals is especially remarkable with the reduction of grain size. |
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| Keywords: | nanocrystalline metals hydrogen embrittlement brittle fracture dislocation emission crack |
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