本文選題：納米晶體　切入點：分子動力學　出處：《中國科技論文》2017年10期 　論文類型：期刊論文

【摘要】：為了認識金屬塊體納米材料微觀結(jié)構(gòu)特征及研究成型過程中微結(jié)構(gòu)形成演化機制,運用分子動力學模擬方法,對金屬材料鎳的劇烈塑性變形制備過程進行了剪切模擬計算,并對變形過程中微結(jié)構(gòu)的演化過程進行了分析。模擬結(jié)果表明:位錯增殖只發(fā)生在塑性變形的早期,而在塑性變形后期,位錯的增長和消亡達到動態(tài)平衡;不同應變下位錯密度的大小受到變形工藝的影響;參與變形的微觀結(jié)構(gòu)有層錯、孿晶和五重孿晶等。模擬結(jié)果給出金屬鎳劇烈塑性變形的整個微觀過程,為研究微觀變形機理研究提供了參考。
[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.
【作者單位】： 內(nèi)蒙古工業(yè)大學理學院;
【基金】：高等學校博士學科點專項科研基金資助項目(20121514120001)
【分類號】：TB383.1;TG146.15

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