Superelasticity and elastocaloric effect of NiTiTa alloy sheet with a nanograined structure fabricated by pack rolling

IF 7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A Pub Date : 2025-06-11 DOI:10.1016/j.msea.2025.148672

J.C. Liu , H.C. Zhao , F. Chen , F.H. Chen , L. Li , Y.X. Tong

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引用次数: 0

Abstract

In this work, Ni_49.6Ti_45.4Ta₅ alloy sheets with a mixed grain structure (mostly nanocrystals) were prepared by pack rolling and post-deformation annealing. This alloy exhibits considerable superelastic property (recoverable strain, ε_R ≥ 5.38 %) and elastocaloric effect (adiabatic temperature change, ΔT_ad ≥ 11.1 K) above 363 K. Under a pre-strain of 6 %, ε_R and ΔT_ad at 363 K are 5.87 % and 11.3 K respectively, which keep almost unchangeable during cyclic tensile deformation. Large and stable superelasticity and elastocaloric effect at high temperature can be attributed to the strengthening effect of nanocrystalline structure (nano-sized single-variant martensite and finer austenite). This characteristic makes the studied Ni_49.6Ti_45.4Ta₅ alloy more suitable for high-temperature applications as compared to the conventional NiTi binary alloy.

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包轧法制备纳米晶NiTiTa合金板材的超弹性和弹热效应

本文采用包轧和变形后退火的方法制备了具有混合晶粒结构（以纳米晶为主）的Ni49.6Ti45.4Ta5合金板材。该合金在363 K以上表现出明显的超弹性（可恢复应变，εR≥5.38%）和弹热效应（绝热温度变化，ΔTad≥11.1 K）。预应变为6%时，363 K时εR和ΔTad分别为5.87%和11.3 K，在循环拉伸变形过程中基本保持不变。高温下大而稳定的超弹性和弹热效应可归因于纳米晶结构（纳米单晶马氏体和细晶奥氏体）的强化作用。这一特性使得所研究的Ni49.6Ti45.4Ta5合金比传统的NiTi二元合金更适合高温应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Science and Engineering: A 工程技术-材料科学：综合

CiteScore

11.50

自引率

15.60%

发文量

1811

审稿时长

31 days

期刊介绍： Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.