SMAT处理AZ80镁合金组织演变与低周疲劳行为研究  

Study on microstructure evolution and low cycle fatigue behavior of AZ80 magnesium alloy treated by SMAT

作　　者：夏双五 黄良顺 XIA Shuangwu;HUANG Liangshun(School of Mechanical Engineering,Tongling University,Tongling 244061,China;School of Mechanical Engineering,Jiujiang Vocational and Technical College,Jiujiang 332007,China;Advanced Copper-based Material Industry Generic Technology Research Center of Anhui Province,Tongling University,Tongling 244061,China)

机构地区：[1]铜陵学院机械工程学院,安徽铜陵244061 [2]九江职业技术学院机械工程学院,江西九江332007 [3]铜陵学院安徽铜基新材料产业共性技术研究中心,安徽铜陵244061

出　　处：《兵器材料科学与工程》2024年第6期102-106,共5页Ordnance Material Science and Engineering

基　　金：安徽高校自然科学研究重点项目(2023AH051664);铜陵学院自然科学校级项目(2022tlxysz08)。

摘　　要：用表面机械研磨处理(SMAT)挤压态AZ80镁合金,研究其组织与力学性能变化,用应变控制探讨其疲劳性能。结果表明:SMAT处理的AZ80变形镁合金由表面到心部形成了梯度结构组织,且变形层厚度随SMAT时间增加而增加,并伴有大量的孪晶产生。在SMAT处理6 min后,剧烈变形层厚度约为200μm。其表层至心部的显微硬度呈梯度分布。应变为0.0064时,SMAT处理后,AZ80镁合金的循环加工硬化率和疲劳寿命明显高于原始挤压态,这主要归因于梯度结构组织及变形产生的残余压应力。The microstructure and mechanical properties of extruded AZ80 magnesium alloy were studied by SMAT,and the fatigue properties were investigated by strain control.The results show that the gradient structure is formed from the surface to the core of the AZ80 deformed magnesium alloy treated by SMAT,and the thickness of the deformed layer increases with the increase of SMAT time,accompanied by a large number of twins.After SMAT treatment for 6 min,the thickness of the severely deformed layer is about 200μm.The microhardness from the surface to the core is distributed in gradient.When the strain is 0.0064,the cyclic work hardening rate and fatigue life of AZ80 magnesium alloy after SMAT are significantly higher than that of the original extrusion state,which is mainly due to the gradient structure and residual compressive stress caused by deformation.

关 键 词：镁合金 硬度 疲劳 孪晶 加工硬化 

分 类 号：TG146.2[一般工业技术—材料科学与工程]