激光热处理对7075铝合金组织和性能的影响  

Effect of Laser Heat Treatment on Microstructure and Mechanical Property of 7075 Al-alloy

作　　者：刘桐 苏睿明[1] 曲迎东[1] 尤俊华[1] 白彦华[1] 李荣德[1] LIU Tong, SU Ruiming, QU Yingdong, YOU Junhua, BAI Yanhua, LI Rongde(School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, Chin)

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870

出　　处：《材料研究学报》2018年第4期263-270,共8页Chinese Journal of Materials Research

基　　金：国家自然科学基金(51574167);辽宁省博士启动资金(20170520337);辽宁省创新团队项目(LT2015020);辽宁省教育厅科学技术研究项目(LGD2016003)~~

摘　　要：以激光表面热处理代替回归再时效(RRA)中的回归过程,研究其对7075铝合金组织及性能的影响。结果表明,激光热处理可代替RRA中的回归部分,得到的7075铝合金的硬度具有双峰特征。在激光功率为850 W、扫描速度为2 mm/s条件下制备的7075铝合金的硬度达到第二峰。其硬度为181 HBW,数值最高,以氧化磨损为主。与第一峰的试样相比,表现出更高的硬度和耐磨性。析出的大量细小弥散的η'和η相,有利于7075铝合金的硬度和耐磨性的提高。The effect of laser heat treatment, in stead of the retrogression process within the traditional retrogression and re-aging （RRA） treatment, on the microstructure and mechanical property of 7075 AI-alloy was investigated. The results show that the laser heat treatment can effectively replace the regression process of RRA. The hardness of the resulted 7075 AI-alloy exhibits the aging feature with double peaks. After pre-aging, laser treatment （850 W, 2 mm/s） and re-aging, the hardness of 7075 AI-alloy reaches the value of the second peak-aged ones with the highest hardness of 181 HBW, which then presented oxidation-wear character during wear test. The second peak-aged alloy possesses higher hardness and much better tribological performance than the first peak-aged ones. Which may be ascribed to the large number of fine precipitates of η＇- and η-phase within the laser treated 7075 AI-alloy.

关 键 词：金属材料 7075铝合金 激光热处理 微观组织 硬度 磨损机制 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG166.3[金属学及工艺—金属材料]