Cracking Behavior, Microstructure and Properties of Selective Laser Melted Al-Mn-Mg-Sc-Zr Alloy

In this paper, the cracking of Al-Mn-Mg-Sc-Zr alloys prepared by selective laser melting (SLM) was comprehensively explored and influence process parameters on generation propagation cracks deeply studied. It found that higher power volume energy density will lead to a decrease in relative material. The lower or alloy. microstructure analysis indicated plenty manganese-rich second phases precipitated at bottom melt pool, which increased tendency occurred pool. Through optimization parameters, SLM forming Al-5.22Mn-1.16Mg-0.81Sc-0.46Zr alloy are successfully obtained, crack-free tensile samples prepared. mechanical properties as-deposited aluminum-manganese is analyzed. inside pool equiaxed grains. size equiaxial grains less than 2 ?m, coarse approximately 5 ?m. As-deposited has room temperature strength 455.2 ± 0.7 MPa elongation 15.4 0.3%. This study provides guidance for high-strength parts, promotes industrial production aluminum near net complex parts.