Microstructure and mechanical properties of laser 3D printedAlSi10Mg aluminum alloy lattice materials

doi:10.13251/j.issn.0254-6051.2020.09.027

Abstract

Abstract: AlSi10Mg aluminum alloy lattice materials were prepared by selecting different laser 3D printing parameters,and the optimized printing parameters were explored.The microstructure and properties of aluminum alloy lattice materials and the influence of subsequent heat treatment on it were studied.The results show that the optimal printing parameters include printing temperature (80 ℃),microns powder layer thickness (30 μm),lasing beam diameter (80 μm),laser energy(370 W),and laser scanning speed (1300 mm/s).The prepared aluminum alloy lattice material has few cavity defects,high compactness,and the microstructure is a layer upon layer crisscrossing laser molten pool,which is composed of small α-Al equiaxial cellular crystal and spherical Si particle phase,and has good performance.After heat treatment,the features of the original laser molten pool defects and equiaxial cellular crystals disappear,the Si particle phase continuously precipitates and grows up,meantime,the hardness and platform stress decrease under the compression performance,so does the static compression properties.

Key words: laser 3D printing, AlSi10Mg alloy, lattice structure materials, microstructure, mechanical properties

CLC Number:

U671.6

Liu Peiling, Chen Kangmin, Zhao Zhenhua. Microstructure and mechanical properties of laser 3D printedAlSi10Mg aluminum alloy lattice materials[J]. Heat Treatment of Metals, 2020, 45(9): 142-148.

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