摘要
使用霍普金森压杆试验装置进行挤压态6013-T4铝合金的室温动态压缩实验,应变速率为1×103～3×103 s-1。结果表明,6013-T4铝合金在动态压缩过程中表现出明显的应变硬化和正应变速率敏感性;随着应变和应变速率的提高位错密度增大,在高应变速率和大应变量变形后试样的位错塞积显著。在相同的变形条件下0°方向试样的应力总是最高,而45°方向试样的应力最低。挤压态6013-T4合金的主要织构类型为{112}<111>和{110}<111>。对于{112}<111>织构,0°、45°和90°方向的最大施密特因子分别为0.27、0.49和0.41。对于{110}<111>织构,最大施密特因子分别为0.27、0.43和0.41。0°方向的施密特因子最小,使该方向的应力水平较高。在相同的应变速率和应变量条件下动态压缩变形时,0°方向试样的位错密度更高。在冲击件的材料选择和结构设计中有必要考虑材料的应变速率敏感性、力学性能各向异性以及微观组织的演变。
Dynamic compression tests of the as-extruded 6013-T4 Al-alloy were carried out via split Hopkinson pressure bar at room temperature with strain rates ranging from 1×103 s-1 to 3×103 s-1. The results show that the alloy exhibits obvious strain hardening and positive strain rate sensitivity. The density of the dislocation increases with the increasing strain and strain rate. High strain rate and large strain deformation lead to the pile-up of dislocations. Under the same impact condition, the 0° specimen displays the highest stress level, and the 45° specimen has the lowest one. The Schmid factors for each type of the main texture components were calculated. The max Schmid factors are 0.27 for 0°, 45° and 90° specimens, and 0.49 and 0.41 for {112}<111> texture;they are 0.27, 0.43 and 0.41 for {110}<111> texture. The Schmid factors of 0° specimens are always the smallest, which results in a higher stress level. When the specimens were dynamic compressed under the same strain and strain rate, the dislocation density of 0°specimen is the highest. Therefore, it is necessary to consider the strain rate sensitivity, anisotropic mechanical behavior and microstructure evolution in the material selection and structural design of components subjected impact loads.
作者
叶拓
吴远志
刘安民
唐徐
李落星
YE Tuo;WU Yuanzhi;LIU Anmin;TANG Xu;LI Luoxing(Research Institute of Automobile Parts Technology,Hunan Institute of Technology,Hengyang 421002,China;State Key Laboratory Design and Manufacture for Vehicle Body,Hunan University,Changsha 410082,China;School of Mechanical and Engineering,Hunan University,Changsha 421002,China)
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2019年第2期109-116,共8页
Chinese Journal of Materials Research
基金
国家自然科学基金(51501061)
国家重点研发计划(2016YFB0101700)
湖南省自然科学基金(2018JJ4031)
衡阳市科技指导性项目(2017KJ254)~~
作者简介
叶拓,男,1987年生,讲师;通讯作者:吴远志,副教授,博士,ranco007@163.com,研究方向为汽车轻量化材料.
