Wide-temperature superelasticity in a dual-phase Nb-doped TiNiCuHf high entropy strain glass alloy

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

Scripta Materialia Pub Date : 2025-02-20 DOI:10.1016/j.scriptamat.2025.116609

Yan Zhang, Pengfei Dang, Yumei Zhou, Xiangdong Ding, Jun Sun, Dezhen Xue

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引用次数: 0

Abstract

We report on a Nb-doped dual-phase high entropy strain glass alloy, Ti_(40-x/2)Ni_(40-x/2)Cu₁₀Hf₁₀Nb_x, specifically designed to demonstrate superelasticity in a wide-temperature range. The precipitation of Nb-rich β-Nb phase result in the increase of Ni-site/Ti-site atomic ratio in the matrix, which gives rise to the decrease of martensitic transformation with increasing Nb content (x). When x exceeds 12.5 %, the martensitic transformation is completely suppressed and it undergoes a strain glass transition. The enhanced austenite stability of strain glass alloy effectively decreases the lower temperature limit of superelasticity. Furthermore, the severe lattice distortion mechanically strengthened the above high entropy strain glass alloy, which increases the higher temperature limit of superelasticity. Thus, the Ti_32.5Ni_32.5Cu₁₀Hf₁₀Nb₁₅ strain glass alloy exhibits superelasticity across a wide temperature range from -125 °C to 50 °C with recoverable strain of 4 %. The designed TiNiCuHfNb high entropy strain glass alloys are promising for outer-space explorations with large temperature variations.

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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.