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Materials Science and Engineering of Powder Metallurgy >

2026 , Vol. 31 >Issue 3: 256 - 266

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

Engineering and Technology

Microstructure and mechanical properties of Al-Ni-Mn-Sc-Zr alloy fabricated by laser powder bed fusion

  • LONG Junjie ,
  • LI Dan ,
  • ZHANG Qin ,
  • LIU Jianling ,
  • CHEN Chao ,
  • ZHOU Kechao
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  • State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China

Received date: 2026-01-13

  Revised date: 2026-03-12

  Online published: 2026-07-03

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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

Cite this article

LONG Junjie , LI Dan , ZHANG Qin , LIU Jianling , CHEN Chao , ZHOU Kechao . 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 . DOI: 10.19976/j.cnki.43-1448/TF.2026004

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