Work

Improved oxidation resistance of (Ti-Zr-Hf-V-Nb-Ta)CoSb high-entropy half Heulser

Year: 2025

Type: article

Abstract: The oxidation behaviour of a high-entropy half Heusler (HEHH) alloy is reported, for the first time, in comparison with its medium- and low-entropy counterparts. TG-DSC analysis demonstrates that HEHH powder exhibits enhanced oxidation resistance, as evidenced by higher oxidation weight change temperature (WCT) compared to medium- and low-entropy half Heusler alloys, which is attributed to high-entropy effects and superior structural stability. Additionally, the aged HEHH bulk sample shows a thinner oxidation layer compared with medium-entropy alloys, further confirming the improved oxidation resistance of HEHH alloy. • Oxidation behaviour (RT-750°C) of (Ti-Zr-Hf-V-Nb-Ta)CoSb (HEHH) was compared with low/medium-entropy alloys. • HEHH exhibits the highest onset temperature for weight change (555 ℃). • HEHH shows a delayed, diffusion-controlled oxidation process. • Improved oxidation resistance of HEHH may be attributed to the high entropy effect.

Source: Journal of Alloys and Compounds

DOI: 10.1016/j.jallcom.2025.180294

Authors: Suwei Li, Kan Chen, Ruizhi Zhang, Michael J. Reece

Institution: Queen Mary University of London

Language: English

Topic: High Entropy Alloys Studies

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,660

Funder: China Scholarship Council