摘要
采用透射电镜(TEM)、光学显微镜(OM)、显微硬度计和微力材料试验机等研究了Al-Zn-Mg合金高能喷丸处理后的表层显微组织和力学性能。结果表明:经高能喷丸处理后,在距离Al-Zn-Mg合金表面约20μm深度范围内形成了随机取向的等轴纳米晶层,表面层的结构特征尺寸随层深的增大呈梯度变化,无明显界面;由于细晶强化作用和合金化层的形成,Al-Zn-Mg合金的表面硬度为基体的3倍以上,硬度随距表面距离的增加而逐渐减小;Al-Zn-Mg合金的整体屈服强度亦显著提高,且形变速率越大,屈服强度越高,这主要是由于变形过程中位错塞积强化、多晶体的细晶强化和加工硬化的共同作用导致的。
Surface microstructure and mechanical properties of Al-Zn-Mg alloy after high-energy shot peening treatment were studied by means of transmission electron microscopy(TEM),optical microscope(OM),microhardness meter and micro-force material testing machine.The results show that after high energy shot peening treatment,a equiaxed nanocrystalline layer with random orientation is formed in the range from the Al-Zn-Mg alloy surface to the depth of about 20μm,the structure characteristic size of the surface layer changes in gradient with the increase of the layer depth,and there is no obvious interface.The surface hardness of the alloy is more than 3 times that of the matrix because of the fine grain strengthening and the formation of alloying layer,and the hardness decreases gradually with the increase of the distance from the surface.The overall yield strength of the Al-Zn-Mg alloy is also significantly improved,and the larger the deformation rate,the higher the yield strength,which is mainly due to the combined effect of dislocation accumulation strengthening,fine grain strengthening of polycrystalline and work hardening during deformation.
作者
马晋芳
刘宝胜
MA Jin-fang;LIU Bao-sheng(Department of Mechanical and Electrical Engineering,Shanxi College of Architectural,Jinzhong 030619,China;College of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China)
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2021年第3期168-173,共6页
Transactions of Materials and Heat Treatment
基金
山西省科技重大专项项目(20191102004)
山西省高等学校科技成果转化培育项目(TSTAP)
山西省新兴产业领军人才项目。
关键词
AL-ZN-MG合金
高能喷丸
纳米晶
显微组织
力学性能
Al-Zn-Mg alloy
high energy shot peening
nanocrystalline layer
microstructure
mechanical property
