激光选区熔化Al-Si-Mg-Zr-Cu合金的成形性、组织和力学性能  

Processability, Microstructure, and Mechanical Property of Al-Si-Mg-Zr-Cu Alloy Fabricated by Selective Laser Melting

作　　者：耿遥祥[1] 单志法 陈永康 宰春凤 王肖 高兴 王宇鑫[1] GENG Yaoxiang;SHAN Zhifa;CHEN Yongkang;ZAI Chunfeng;WANG Xiao;GAO Xing;WANG Yuxin(School of Materials Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang 212100,China)

机构地区：[1]江苏科技大学材料科学与工程学院,江苏镇江212100

出　　处：《材料开发与应用》2024年第1期23-29,F0004,共8页Development and Application of Materials

基　　金：国家自然科学基金资助项目(52001140)。

摘　　要：为提升激光选区熔化(SLM)Al-Si-Mg系铝合金的强度,本研究以SLM专用高Mg含量Al-Si-Mg-Zr合金为基础,通过引入Cu元素对合金进行成分改性,系统研究了Al-Si-Mg-Zr-Cu合金的SLM成形性、显微组织和力学性能。结果表明,在250 W低激光功率下,合金具有良好的SLM成形性能,最大相对密度为99.8%。合金的显微组织以等轴晶为主,熔池内部存在少量的柱状晶,合金的晶粒内部包含网状亚结构,α-Al基体内存在纳米级沉淀相。在激光功率250 W,激光扫描速度1 200 mm/s的工艺参数下制备的SLM成形Al-Si-Mg-Zr-Cu合金的显微硬度为(159±4)HV、抗拉强度为(461±25) MPa、屈服强度为(397±32) MPa、伸长率为(2.4±0.7)%,其强度明显高于目前报道的SLM成形Al-Si-Mg系铝合金的。In order to improve the strength of the laser selective melted(SLM)Al-Si-Mg aluminum alloy,a Cu-modified Al-Si-Mg-Zr alloy with high Mg content is fabricated.The processability,microstructure,and mechanical property of the SLM-fabricated Al-Si-Mg-Zr-Cu alloy are systematically studied.The results indicate that the sample exhibits good SLM processability at low laser power(250 W),with a maximum relative density of 99.8%.The microstructure of the alloy is mainly composed of equiaxed grains,with a small amount of columnar grains distributed in the melt pool.The grains contain reticular substructures,and there are nanoscale precipitates exising in theα-Al matrix.When the luse power is 250 W,and the scanning speed is 1200 mm/s,the microhardness,tensile strength,yield strength,and elongation of the samples are(158±4)HV,(461±25)MPa,(397±32)MPa,and(2.4±0.7)%,respectively.The strength of the SLM-fabricated Al-Si-Mg-Zr-Cu alloy is higher than that of the SLM-fabricated Al-Si-Mg alloy.

关 键 词：激光选区熔化 Cu改性Al-Si-Mg-Zr合金 微观组织 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]