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Impact of vanadium (V) content on in-situ oxidation, high temperature mechanical strength and tribological properties of Al0.5CrFeNiVx high entropy alloys

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posted on 2025-05-20, 01:13 authored by Xiaotian Wu, Lihong SuLihong Su, Anh TieuAnh Tieu, J Cheng, Cuong Phu NguyenCuong Phu Nguyen, Hongtao ZhuHongtao Zhu, J Yang, Guanyu Deng

In this study, four vanadium (V) containing high entropy alloys (HEAs) Al0.5CrFeNiVx (x = 0.25, 0.5, 0.75, 1.0) were developed and investigated, in terms of examining the influence of V content on their microstructure, in-situ oxidation behavior, high temperature mechanical strength, and high temperature tribological performances. An increase in the V content causes precipitation of the Laves phase (VAl2) in the body-centered cubic (BCC) matrix. This structural transition increases the alloy hardness and compressive strength through solid solution strengthening, precipitation strengthening and grain refinement strengthening. When x is increased from 0.25 to 1, the maximum compressive strength increases from about 2476 to 3241 MPa at room temperature and from about 521 to 797 MPa at 700 °C, respectively. In-situ oxidation investigation reveals that a higher V content accelerates the oxidation and provides a direct evidence of vanadium oxides melting at 700 °C and thus forming the liquid oxide phases on the surface of HEAs. During high temperature tribological contact, the liquid oxide phases minimize the friction, allowing thicker and more complex oxide layers to form on the worn surface to improve the HEAs’ wear resistance. The findings in this work contribute to the development of novel HEAs with superior properties for potential applications that need outstanding mechanical strength, wear resistance, and thermal stability.

Funding

Fabrication of large-scale 2D metallic nanosheets by accumulative rolling : Australian Research Council (ARC) | DE180100124

ARC Training Centre for Innovative Composites for the Future of Sustainable Mining Equipment : Australian Research Council (ARC) | IC220100028

History

Journal title

Tribology International

Volume

202

Article/chapter number

ARTN 110375

Total pages

20

Publisher

ELSEVIER SCI LTD

Publication status

  • Published

Language

English

Associated Identifiers

grant.7074015 (dimensions-grant-id); grant.12950663 (dimensions-grant-id)