【摘 要】
：
A novel Al-5Mg2Si-2Mg alloy was processed by selective laser melting (SLM) to understand its repre-sentative features of microstructural evolution and mechanical properties during additive manufacturing(AM).The as-SLM fabricated Al-5Mg2Si-2Mg alloy is fou
【机 构】
：
State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China;Light Alloy
论文部分内容阅读
A novel Al-5Mg2Si-2Mg alloy was processed by selective laser melting (SLM) to understand its repre-sentative features of microstructural evolution and mechanical properties during additive manufacturing(AM).The as-SLM fabricated Al-5Mg2Si-2Mg alloy is found to deliver much less hot cracks and other defects.Meanwhile,excellent mechanical property is also achieved,i.e.452 ± 11 MPa for ultimate ten-sile strength,295±14 MPa for yield strength,and 9.3± 2.5％ for elongation.Clearly,these mechanical properties are better than that obtained by high pressure die casting (HPDC),and better than some other alloys obtained by SLM.The as-SLM fabricated Al-SMg2Si-2Mg alloy is featured by the significantly re-fined microstructures in the compact primary α-Al,the divorced Mg2Si eutectic networks distributing at α-Al grain boundaries,and some α-AlFeMnSi phase in association with eutectic Mg2Si phase.The high strength and ductility of the alloy are attributed to its unique features including (a) the reduced solid-ification range,(b) the possible increase of the eutectic level in the microstructure,and (c) the shift of eutectic point and the maximum solubility point of Mg2Si in Al matrix.
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