角度相关函数与径向分布函数分析微组织结构

陈家轩^1,2, 卜琳华³, 梁迎春¹, 王立权², 鞠晓峰³

1.哈尔滨工业大学机电学院;2.哈尔滨工程大学机电学院;3.哈尔滨工业大学经济与管理学院



摘要:

为了研究纳米加工过程导致材料组织结构的变化,采用分子动力学方法,构建了单晶铜耦合纳动纳米加工模型,并进行了纳米切削过程仿真.提出采用角度相关函数(ADF)结合径向分布函数(RDF)方法,分析单晶铜耦合纳动加工过程中材料亚表面组织结构变化.模拟结果表明,单晶铜(111)表面耦合纳动加工过程中,在材料的亚表面原子存在从密排六方排列转变为面心结构排列的不稳相变.

关键词:  角度相关函数  径向分布函数  切削  相变  纳米

DOI：10.11918/j.issn.0367-6234.2011.05.008

分类号:O174

基金项目:国家杰出青年基金资助项目(50925521);国家自然科学基金资助项目(51075092);黑龙江省自然科学基金资助项目(E200903);教育部人文社科基金资助项目(10YJC630008)



Analysis of material microstructure change by ADF and RDF methods

CHEN Jia-xuan^1,2, BU Lin-hua³, LIANG Ying-chun¹, WANG Li-quan², JU Xiao-feng³

1.School of Mechatranics Engineering,Harbin Institute of Technology,150001 Harbin,China;2.School of Mechanical and Electrical Engineering,Harbin Engineering University,150001 Harbin,China;3.School of Management,Harbin Institute of Technology,150001 Harbin,China

Abstract:

To research the microstructure change in nanomachining process,a coupling nanofretting nanomachining model of single crystal copper is presented using molecular dynamics methods,and nanocutting processes are simulated.By angle distribution function(ADF) and radial distribution function(RDF),the structure changes of subsurface in material are analyzed,and the results show that there exists an unstable phase transition from the close-packed hexagonal structure to face-centered cubic structure in the subsurface of single crystal copper during coupling nanofretting nanomachining process.

Key words:  angle distribution function  radial distribution function  cutting  phase transition  nano