Microstructure, segregation and oxidation mechanism of AlV55 alloy prepared by aluminothermy

HE Zhimin; ZHANG Qi; ZHANG Yang; LI Xiaodong

doi:10.7513/j.issn.1004-7638.2026.04.006

Volume 47 Issue 4

Aug. 2026

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HE Zhimin, ZHANG Qi, ZHANG Yang, LI Xiaodong. Microstructure, segregation and oxidation mechanism of AlV55 alloy prepared by aluminothermy[J]. IRON STEEL VANADIUM TITANIUM, 2026, 47(4): 51-57. doi: 10.7513/j.issn.1004-7638.2026.04.006

Citation:

HE Zhimin, ZHANG Qi, ZHANG Yang, LI Xiaodong. Microstructure, segregation and oxidation mechanism of AlV55 alloy prepared by aluminothermy[J]. IRON STEEL VANADIUM TITANIUM, 2026, 47(4): 51-57. doi: 10.7513/j.issn.1004-7638.2026.04.006

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Microstructure, segregation and oxidation mechanism of AlV55 alloy prepared by aluminothermy

doi: 10.7513/j.issn.1004-7638.2026.04.006

1.
Ningxia Orient Tantalum Industry Co., Ltd., Shizuishan 753000, Ningxia, China
2.
Ningxia University, Yinchuan 750000, Ningxia, China

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Received Date: 2026-04-20
Accepted Date: 2026-05-11
Rev Recd Date: 2026-05-07
Publish Date: 2026-08-31

Abstract

Abstract

Using vanadium pentoxide and aluminum powder as raw materials, AlV55 vanadium-aluminum alloy was fabricated via the thermite reaction method. The macroscopic stratification, microstructure, elemental distribution and impurity behavior of the alloy ingot were systematically investigated. The results show that distinct upper and lower stratification occurs in the alloy ingot after the thermite reaction. The upper layer features loose microstructure, internal pores and alumina inclusions, with low and highly fluctuating vanadium content. Meanwhile, the lower layer possesses dense microstructure, strong metallic luster, high and uniformly distributed vanadium content. Microscopically, needle-shaped vanadium-aluminum solid solution is formed in the upper layer, while fishbone-shaped vanadium-aluminum solid solution dominates the lower layer. Composition segregation is caused by the coupled effect of diffusion rate difference and density disparity between vanadium and aluminum. The vanadium content is approximately 51.76 wt% in the upper layer and 58.87 wt% in the lower layer. The contents of impurities including oxygen, nitrogen, iron and silicon in the upper layer are remarkably higher than those in the lower layer. Analysis on the oxide layers of the alloy indicates that the binding energy (EB) of V 2p characteristic peaks varies with different colored oxide layers, and higher vanadium valence corresponds to larger binding energy. This study reveals the structural inhomogeneity and oxidation coloration mechanism of vanadium-aluminum alloys prepared by thermite reaction, and provides a theoretical basis for process optimization and high-quality fabrication of vanadium-aluminum alloys.
- thermite process,
- vanadium-aluminum alloy,
- composition segregation,
- impurity distribution,
- oxidation color

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References(21)

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