Work

High-Temperature Properties of an Equimolar CoNiFeCr Medium-Entropy Alloy with Added Titanium

Year: 2025

Type: article

Abstract: This study investigates the effects of Ti addition on the microstructures, melting temperature ranges, thermal expansion behavior, high temperature creep and oxidation resistances of an equimolar CoNiFeCr alloy of a foundry origin. 1.5 wt.% Ti added did not really change the single–phased state of the reference quaternary alloy but induces a significant decrease of the melting start and melting end temperatures. The thermal expansion coefficient is slightly lowered only while the creep resistance at 1100°C is significantly enhanced. The oxidation at 1200°C is controlled by species diffusion through a continuous chromia layer and the parabolic constant is higher than for the quaternary alloy, due to external and internal Ti oxidation. The presence of a thin layer of titanium oxide covering the chromia scale is suspected to limit chromia volatilization and scale spallation at cooling. Globally Ti demonstrated a globally beneficial influence of the high temperature properties of the alloy.

Source: Micro

DOI: 10.3390/micro5040057

Authors: Patrice Berthod, Siouare Hammi, Lionel Aranda, Christophe Rapin

Institutions: Université de Lorraine, Centre National de la Recherche Scientifique, Institut Jean Lamour

Language: English

Topic: High Entropy Alloys Studies

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,207

OpenAlex ID: W4417123229

FWCI:

Cites: 14

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