摘要
系统研究时效温度对激光粉末床熔融成形Al-Mn-Mg-Sc-Zr合金显微组织及力学性能的影响。结果表明,成形态合金组织致密且无裂纹,平均晶粒尺寸为3.51μm,屈服强度为(547±3)MPa。经300℃时效后,合金组织中析出大量尺寸为2~3 nm且与基体共格的Al3Sc纳米颗粒。时效样品的屈服强度提升至(616±4)MPa,这得益于合金中的析出强化、固溶强化和晶界强化。当时效温度超过300℃时,部分Mn和Zr从固溶体中析出,形成Al6Mn和Al3(Sc,Zr)相。经500℃时效后,合金中Al6Mn相和Al3(Sc,Zr)相分别粗化至约600和30nm。此,合金的屈服强度下降至(372±3) MPa。
The influence of aging temperatures on the microstructure and mechanical properties of an Al-Mn-Mg-Sc-Zr alloy prepared by laser powder bed fusion(L-PBF)was systematically studied.The results show that the fabricated alloy was a dense and crack-free piece with a fine grain size of 3.51μm and a yield strength of(547±3)MPa.When the alloy was subjected to aging at 300°C,a large amount of highly coherent Al3Sc nanoparticles(2-3 nm)precipitated from the Al matrix.The aged sample exhibited a high yield strength of(616±4)MPa,which can be attributed to precipitation strengthening,solid solution strengthening,and grain boundary strengthening.When the alloy was aged at a temperature higher than 300°C,part of the dissolved Mn and Zr precipitated in the form of Al6Mn and Al3(Sc,Zr).When the alloy was aged at 500°C,the Al6Mn and Al3(Sc,Zr)precipitates grew to approximately 600 and 30 nm,respectively,in size.Consequently,the yield strength of the alloy decreased to(372±3)MPa.
作者
唐浩
耿遥祥
高超峰
席晓莹
张建涛
肖志瑜
Hao TANG;Yao-xiang GENG;Chao-feng GAO;Xiao-ying XI;Jian-tao ZHANG;Zhi-yu XIAO(National Engineering Research Center of Near-net Shape Forming for Metallic Materials,South China University of Technology,Guangzhou 510640,China;School of Materials Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China;Institute of Advanced Additive Manufacturing,Ji Hua Laboratory,Foshan 528200,China)
基金
National Natural Science Foundation of China(Nos.52001140,52274363)
Guangdong Basic Applied Basic Research Foundation,China(Nos.2022A1515010558,2022A1515011597,2022A1515240065)。
