金属镍剧烈塑性变形过程中微结构演化的分子动力学模拟

发布时间：2018-03-22 03:20

本文选题：纳米晶体　切入点：分子动力学　出处：《中国科技论文》2017年10期 　论文类型：期刊论文

【摘要】：为了认识金属块体纳米材料微观结构特征及研究成型过程中微结构形成演化机制,运用分子动力学模拟方法,对金属材料镍的剧烈塑性变形制备过程进行了剪切模拟计算,并对变形过程中微结构的演化过程进行了分析。模拟结果表明:位错增殖只发生在塑性变形的早期,而在塑性变形后期,位错的增长和消亡达到动态平衡;不同应变下位错密度的大小受到变形工艺的影响;参与变形的微观结构有层错、孪晶和五重孪晶等。模拟结果给出金属镍剧烈塑性变形的整个微观过程,为研究微观变形机理研究提供了参考。
[Abstract]:In order to understand the microstructure characteristics of metal bulk nanomaterials and to study the mechanism of microstructure formation and evolution during the forming process, the shear simulation calculation of the preparation process of nickel during severe plastic deformation was carried out by using molecular dynamics simulation method. The simulation results show that dislocation proliferation occurs only in the early stage of plastic deformation, but in the later stage of plastic deformation, the growth and extinction of dislocation reach dynamic equilibrium. The size of dislocation density under different strain is affected by the deformation process, and the microstructure involved in the deformation is stacked fault, twin and five-fold twin, etc. The simulation results show the whole microscopic process of the severe plastic deformation of nickel. It provides a reference for the study of microscopic deformation mechanism.
【作者单位】：内蒙古工业大学理学院;
【基金】：高等学校博士学科点专项科研基金资助项目(20121514120001)
【分类号】：TB383.1;TG146.15

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