激光粉末床熔融Al-Ni-Mn-Sc-Zr合金的显微组织和力学性能

doi:10.19976/j.cnki.43-1448/TF.2026004

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Abstract Al-Ni-Mn-Sc-Zr alloy was fabricated using gas-atomized Al-5Ni-0.8Mn-0.4Sc-0.2Zr pre-alloyed powder as raw materials by laser powder bed fusion. The effects of laser power and scanning speed on the microstructure and mechanical properties were investigated using X-ray diffractometer, scanning electron microscope, transmission electron microscope, and universal material testing machine. The results indicate that the optimal processing parameters are a laser power of 350 W and a scanning speed of 1 800 mm/s, under which the alloy achieves a relative density exceeding 99.5% without observable macroscopic cracks. The alloy consists of an α-Al matrix and ribbon-like Al₃Ni phases, with grains exhibiting an alternating distribution of columnar and equiaxed morphologies. Mn, Sc, and Zr elements are solubilized within the matrix, and the eutectic structure is significantly refined to the nanoscale. The alloy exhibits excellent mechanical properties at both room and elevated temperatures. At room temperature, the tensile strength, yield strength, and elongation is (438±11.99) MPa, (306 ±17.14) MPa, and (6.3±0.4)%, respectively. When test at 300 ℃, the yield strength is maintained at (246±4.61) MPa, while the elongation increases to (9.0±1.6)%. The strengthening behavior is primarily attributed to the synergistic effects of uniformly dispersed nanoscale Al₃Ni phases, solid-solution strengthening induced by Mn, and the high dislocation density.

Key words： laser powder bed fusion aluminum alloy relative density microstructure mechanical property

Received: 13 January 2026 Published: 03 July 2026

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	Articles by authors
	LONG Junjie
	LI Dan
	ZHANG Qin
	LIU Jianling
	CHEN Chao
	ZHOU Kechao

Cite this article:

LONG Junjie,LI Dan,ZHANG Qin, et al. Microstructure and mechanical properties of Al-Ni-Mn-Sc-Zr alloy fabricated by laser powder bed fusion[J]. Materials Science and Engineering of Powder Metallurgy, 2026, 31(3): 256-266.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2026004 OR http://pmbjb.csu.edu.cn/EN/Y2026/V31/I3/256

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