超细晶铜在循环载荷下的非均匀变形演化  

Evolution of Inhomogeneous Deformation of Ultrafine Crystalline Copper under Cyclic Loading

作　　者：郑战光[1] 徐涛 孙腾 谢昌吉 ZHENG Zhanguang;XU Tao;SUN Teng;XIE Changji(College of Mechanical Engineering,Guangxi University,Nanning 530004,China;College of Mechanical Engineering&Ocean Engineering,Beibu Gulf University,Qinzhou 535011,China)

机构地区：[1]广西大学机械工程学院,广西南宁530004 [2]北部湾大学机械与船舶海洋工程学院,广西钦州535011

出　　处：《热加工工艺》2022年第4期33-36,41,共5页Hot Working Technology

基　　金：国家自然科学基金资助项目(51675110,51465002);广西高校中青年教师科研基础能力提升项目(2021KY0426)。

摘　　要：材料的不均匀变形对机械零件的各种力学性能有重要影响。为准确了解超细晶铜材料不均匀变形的演变情况,对称循环载荷下材料模型进行不均匀应变演化的研究:通过多晶voronoi集合体和电子背散射衍射(EBSD)图构建代表性的体积单元(RVE),并进行对称循环载荷加载;对RVE内所有单元的应变情况进行统计和分析,使用纵向应变的统计标准偏差来表征不均匀变形的情况。结果表明:超细晶铜在循环中应变不均匀性随着加载和卸载而变化,随着循环周期的增加逐渐增加,拉伸峰值位置应变不均匀性逐渐大于压缩峰值位置。The inhomogeneous deformation of materials has an important effect on various mechanical properties of mechanical parts.In order to learn the evolution of inhomogeneous strain in ultrafine crystalline copper accurately,the material model was studied for inhomogeneous strain under symmetric cyclic loading.The construction of representative volume units(RVE)from polycrystalline voronoi assemblies and electron backscatter diffraction(EBSD)maps with symmetric cyclic loading;The strain of all element within the RVE was counted and analyzed,and the statistical standard deviation of the longitudinal strain was used to describe the situation of inhomogeneous of deformation.The results show that the strain inhomogeneity of ultrafine crystalline copper during cycling changes with loading and unloading,and the inhomogeneity increases with the number of cycles.The strain inhomogeneity at the peak tensile position is gradually greater than that at the peak compression position.

关 键 词：超细晶 非均匀变形 代表性体积单元 对称循环 

分 类 号：TG146[一般工业技术—材料科学与工程]