激光熔化沉积Al-Mg-Sc-Zr合金元素烧损及缺陷分析  

Analysis of Elemental Burn Loss and Defect of Laser Melting Deposited Al-Mg-Sc-Zr Alloy

作　　者：刘筱[1] 谢莉 肖罡 朱必武[1] 詹海鸿 李伟奇 LIU Xiao;XIE Li;XIAO Gang;ZHU Biwu;ZHAN Haihong;LI Weiqi(School of Mechanical Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Jiangxi Copper Technology Institute Co.,Ltd,Nanchang 330096,China;Light Alloys Research Institute,Central South University,Changsha 410083,China)

机构地区：[1]湖南科技大学机电工程学院,湘潭411201 [2]江西铜业技术研究院有限公司,南昌330096 [3]中南大学轻合金研究院,长沙410083

出　　处：《机械工程材料》2025年第1期59-64,共6页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(52471055,52471132);江西省自然科学基金杰出青年基金资助项目(20224ACB218002);江西省高层次高技能领军人才培养工程资助项目;福建省科技计划杰出青年基金资助项目(2024J010031)。

摘　　要：在不同扫描速度(3,4,5 mm·s^(-1))下激光熔化沉积Al-Mg-Sc-Zr高强铝合金,研究了镁、钪、锆元素烧损行为及合金缺陷形成机理。结果表明:随着扫描速度增加,合金中气孔平均尺寸增大,数量增多;不同扫描速度下,合金中铝、镁、钪和锆元素都呈均匀分布;沉积过程中钪和锆元素主要烧损形式为氧化,其烧损率不受扫描速度影响,镁元素主要烧损形式为汽化,随着扫描速度增加,激光能量密度减小,烧损率先增大后减小。Al-Mg-Sc-Zr high strength aluminum alloy was prepared by laser melting deposition at different scanning rates(3,4,5 mm·s^(−1)).The elemental burn loss behavior of Mg,Sc and Zr and defects formation mechanism were analyzed.The results show that with the increase of scanning rate,the average size and number of pores in the alloy increased.Under different scanning rates,Al,Mg,Sc and Zr were evenly distributed in the alloy.During deposition,the main burn loss form of Sc and Zr was oxidation,and their burn loss rates were not affected by the scanning rate;the main burn loss form of Mg was vaporization,and with the increase of scanning rate,laser energy density decreased,the Mg elemental burn loss rate increased first and then decreased.

关 键 词：激光熔化沉积 AL-MG-SC-ZR合金 显微组织 元素烧损 孔隙缺陷 

分 类 号：TF124[冶金工程—粉末冶金]