Superior high-temperature strength induced by solid solution strengthening in light-weight refractory high entropy alloy

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia Pub Date : 2025-01-15 DOI:10.1016/j.scriptamat.2025.116562

Z.H. Cao , W.L. Zhao , M.J. Kai , Z.Y. Cheng , Y.J. Ma , X.T. Wang , J. Cheng , Y.Y. Hu , T.R. Xu , X.Y. Song , S. Wu

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引用次数: 0

Abstract

Refractory high entropy alloys (RHEAs) have a high melting point and strength, exhibiting great potential for high-temperature applications. In this work, a novel single-phase Ti₆₀(AlVCr)₂₈Mo₁₂ RHEA with a low density of 5.3 g/cm³ is reported, exhibiting a high strength and plasticity at room and elevated temperatures. The single-phase RHEA has a high yield strength of 760 MPa with a significant strain hardening capability at 600 °C and remains 530 MPa as the temperature increases to 800 °C, which is twice as high as dual-phase Ti₆₀(AlVCr)₄₀ RHEA. Mo element has effectively stabilized the high-entropy BCC solid solution phase, inhibiting the formation of ordered precipitates in the matrix phase. The severe lattice distortion increases the dislocation movement barrier and thereby promotes the dislocation multiplication during high-temperature plastic deformation, resulting in significant strain hardening. The strong solid solution strengthening originating from large modulus mismatch is mainly responsible for the enhanced high-temperature softening resistance.

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来源期刊

Scripta Materialia 工程技术-材料科学：综合

CiteScore

11.40

自引率

5.00%

发文量

581

审稿时长

34 days

期刊介绍： Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.