Processability,Microstructure,and Mechanical Property of Al-Si-Mg-Zr-Cu Alloy Fabricated by Selective Laser Melting
In order to improve the strength of the laser selective melted(SLM)Al-Si-Mg aluminum alloy,a Cu-modified Al-Si-Mg-Zr alloy with high Mg content is fabricated.The processability,microstructure,and mechanical property of the SLM-fabricated Al-Si-Mg-Zr-Cu alloy are systematically studied.The results indicate that the sample exhibits good SLM proces-sability at low laser power(250 W),with a maximum relative density of 99.8％.The microstructure of the alloy is mainly com-posed of equiaxed grains,with a small amount of columnar grains distributed in the melt pool.The grains contain reticular sub-structures,and there are nanoscalc precipitates exising in the α-Al matrix.When the luse power is 250 W,and the scanning speed is 1 200 mm/s,the microhardness,tensile strength,yield strength,and elongation of the samples are(158±4)HV,(461±25)MPa,(397±32)MPa,and(2.4±0.7)％,respectively.The strength of the SLM-fabricated Al-Si-Mg-Zr-Cu al-loy is higher than that of the SLM-fabricated Al-Si-Mg alloy.
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