Crack elimination and strength enhancement mechanisms of selective laser melted Si-modified Al-Mn-Mg-Er-Zr alloy
于江 1耿遥祥 1鞠洪博 2张志杰 1许俊华1
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作者信息
1. 江苏科技大学材料科学与工程学院,镇江 212100
2. 江苏科技大学材料科学与工程学院,镇江 212100;Department of Mechanical Engineering,CEMMPRE-Centre for Mechanical Engineering Materials and Processes,University of Coimbra,Coimbra,Portugal
In order to increase the processability and process window of the selective laser melting(SLM)-fabricated Al-Mn-Mg-Er-Zr alloy,a novel Si-modified Al-Mn-Mg-Er-Zr alloy was designed.The effect of Si alloying on the surface quality,processability,microstructure,and mechanical properties of the SLM-fabricated alloy was studied.The results showed that introducing Si into the Al-Mn-Mg-Er-Zr alloy prevented balling and keyhole formation,refined the grain size,and reduced the solidification temperature,which eliminated cracks and increased the processability and process window of the alloy.The maximum relative density of the SLM-fabricated Si/Al-Mn-Mg-Er-Zr alloy reached 99.6％.The yield strength and ultimate tensile strength of the alloy were(371±7)MPa and(518±6)MPa,respectively.These values were higher than those of the SLM-fabricated Al-Mn-Mg-Er-Zr and other Sc-free Al-Mg-based alloys.
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