Study on Microstructure and Mechanical Properties Anisotropy of Aluminium Alloy Prepared by Selective Laser Melting
The effects of anisotropy on microstructure and mechanical properties of Al-4.8Mn-1.7Mg-0.75Sc-0.75Zr alloy were studied.The results showed that crack-free dense samples were prepared by SLM.The microstructure of longitudinal samples is typical of a melt pool,with fine equiaxed grains and long columnar grains.The microstructure of transverse samples is strip-shaped and formed of tiny equiaxed grains.After aging treatment at 300℃for 5 h,the yield strength,tensile strength,and elongation of transverse samples are 512 MPa,540 MPa,and 15%,respectively,whereas the yield strength,tensile strength,and elongation of longitudinal samples are 502 MPa,536 MPa,and 12%,respectively.Mechanical property anisotropy is insignificant.The research presented above will provide favorable references for the use of 3D printed high-strength aluminum in aerospace.
selective laser meltingAl-Mn-Mg-Sc-Zrmicrostructure and mechanical propertiesanisotropy
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