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 3.51 pm and a yield strength of(547±3)MPa.When the alloy was subjected to aging at 300 ℃,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 ℃,part of the dissolved Mn and Zr precipitated in the form of Al6Mn and Al3(Sc,Zr).When the alloy was aged at 500 ℃,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.
关键词
激光粉末床熔融/Al-Mn-Mg-Sc-Zr合金/显微组织演变/力学性能/Al3Sc纳米颗粒
Key words
laser powder bed fusion/Al-Mn-Mg-Sc-Zr alloy/microstructure evolution/mechanical properties/Al3Sc nanoparticle
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基金项目
国家自然科学基金(52001140)
国家自然科学基金(52274363)
Guangdong Basic Applied Basic Research Foundation,China(2022A1515010558)
Guangdong Basic Applied Basic Research Foundation,China(2022A1515011597)
Guangdong Basic Applied Basic Research Foundation,China(2022A1515240065)
维普
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