Medium but highly stable superelasticity and elastocaloric effect in an aging-treated Ni51.7Ti47.3Ta1 shape memory alloy

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-03-18 DOI:10.1016/j.jallcom.2025.179804

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

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引用次数: 0

Abstract

This work demonstrates the effect of aging temperature on transformation path is primarily dependent on the size of Ni₄Ti₃ precipitates in a Ni-rich Ni_51.7Ti_47.3Ta₁ (at%) alloy. B2↔R↔B19' and B2↔B19' transformations are found in the 773 and 873 K-aged samples, separately, that contain large Ni₄Ti₃ precipitates (average length exceeding 150 nm). The sample aged at 673 K undergoes single-stage R-phase transformation due to the suppression of coherent Ni₄Ti₃ nanoprecipitates on B19' martensite. In this sample, with the application of external stress, B2 → B19' transformation takes place at room temperature resulting in medium superelasticity (recovery strain is 4 %) and elastocaloric effect (adiabatic temperature change is −9.4 K). Ultrahigh cyclic stability for these functional properties is probably due to the strengthening effect of Ni₄Ti₃ nanoprecipitates and small transformation strain.

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时效处理Ni51.7Ti47.3Ta1形状记忆合金的中等但高度稳定的超弹性和弹热效应

研究表明，时效温度对相变路径的影响主要取决于富镍Ni51.7Ti47.3Ta1 （at）中Ni4Ti3析出相的大小。%)合金。B2↔R↔B19′和B2↔B19′分别存在于773和873 k时效样品中，它们含有较大的Ni4Ti3沉淀（平均长度超过150 nm）。673 K时效后，由于B19′马氏体上Ni4Ti3纳米相的抑制，样品发生了单阶段r相变。在此样品中，在外加应力作用下，在室温下发生B2→B19′相变，产生中等超弹性（恢复应变为4%）和弹热效应（绝热温度变化为-9.4 K），这些功能性能的超高循环稳定性可能是由于Ni4Ti3纳米沉淀物的强化作用和较小的相变应变。

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.