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
耿遥祥 1单志法 1陈永康 1宰春凤 1王肖 1高兴 1王宇鑫1
作者信息
- 1. 江苏科技大学材料科学与工程学院,江苏镇江 212100
- 折叠
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.
Abstract
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 proces-sability at low laser power(250 W),with a maximum relative density of 99.8％.The microstructure of the alloy is mainly com-posed of equiaxed grains,with a small amount of columnar grains distributed in the melt pool.The grains contain reticular sub-structures,and there are nanoscalc precipitates exising in the α-Al matrix.When the luse power is 250 W,and the scanning speed is 1 200 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 al-loy 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Key words
selective laser melting/Cu-modified Al-Si-Mg-Zr alloy/microstructure/mechanical property引用本文复制引用
出版年
2024
NETL
NSTL
万方数据