高强度Al-Mg-Sc-Zr合金的激光熔化沉积工艺研究  

Study on Process Parameters for Preparing a High-Strength Al-Mg-Sc-Zr Alloy by Laser Melting Deposition

作　　者：邹健 刘红军 赵宇辉[2,3] 赵吉宾 贺晨[2,3] 王志国 Zou Jian;Liu Hongjun;Zhao Yuhui;Zhao Jibin;He Chen;Wang Zhiguo(College of Mechanical and Electrical Engineering,Shenyang Aerospace University,Shenyang 110135,Liaoning,China;Shenyang Institute of Automation,Chinese Academy of Sciences,Shenyang 110016,Liaoning,China;Institutes for Robotics and Intelligent Manufacturing,Chinese Academy of Sciences,Shenyang 110169,Liaoning,China)

机构地区：[1]沈阳航空航天大学机电工程学院,辽宁沈阳110135 [2]中国科学院沈阳自动化研究所,辽宁沈阳110016 [3]中国科学院机器人与智能制造创新研究院,辽宁沈阳110169

出　　处：《激光与光电子学进展》2023年第9期302-310,共9页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(52105415);国防科技重点实验室基金(JCKY61420052017)。

摘　　要：基于激光熔化沉积技术制备了高强度Al-Mg-Sc-Zr合金试样,采用金相显微镜、扫描电子显微镜、显微硬度和室温拉伸等试验方法,研究了能量密度和送粉速率对沉积试样的致密度、微观组织演变和力学性能的影响规律。结果表明:在送粉速率一定的条件下,随着能量密度的提高,沉积试样的致密化行为逐渐增强,致密度呈现逐渐升高的趋势。随着送粉速率的提高,趋势愈发显著。在送粉速率为5.5 g/min、能量密度为50~150 J/mm^(2)的条件下,试样致密度从97.88%提高至99.47%。在优化的工艺条件下,即能量密度为100 J/mm^(2)、送粉速率为2.5 g/min时,获得了最优综合力学性能的沉积态试样,其致密度、屈服强度、抗拉强度、延伸率以及显微硬度分别为99.51%、268 MPa、450 MPa、18.4%和120.18 HV0.2。This study investigated the preparation of highstrength AlMgScZr alloy samples by laser melting deposition technology.The effects of energy density and powder feeding rate modifications on the density,microstructural evolution,and mechanical properties of the deposited samples were investigated using metallographic,scanning electron microscopes,microhardness,and tensile properties at room temperature.Results showed that under a constant powder feeding rate,the deposited samples’densification behavior and density gradually increased with an increase in energy density.This trend became more significant with an increase in the powder feeding rate.Hence,when the powder feeding rate was set to 5.5 g/min,the density of 50‒150 J/mm^(2) samples specifically increased from 97.88%to 99.47%.Nevertheless,the sample with the best comprehensive mechanical properties was deposited under optimized technological conditions,namely an energy density of 100 J/mm^(2) and a powder feeding rate of 2.5 g/min.Its density,yield strength,tensile strength,elongation,and microhardness were 99.51%,268 MPa,450 MPa,18.4%,and 120.18 HV0.2,respectively.

关 键 词：激光技术 铝镁钪锆合金 激光熔化沉积 工艺参数 微观组织 力学性能 

分 类 号：TG146[一般工业技术—材料科学与工程]