Large thermal hysteresis and high cycling stability induced by aging in a NiTiNb alloy

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

Scripta Materialia Pub Date : 2025-04-23 DOI:10.1016/j.scriptamat.2025.116718

Qiuzhen Li , Daqiang Jiang , Yinong Liu , Genfa Kang , Kaiyuan Yu , Jingyuan Guo , Shihan Li , Lishan Cui

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Abstract

This study compares the transformation behavior and thermal cycling stability of a Ni₅₁Ti_48.5Nb_0.5 (at.%) alloy in its solution-treated and low-temperature-aged state. Being Ni-rich of the B2 stoichiometry, low-temperature aging caused the formation of clusters and led to B2 disordering and lattice distortions. In consequence, the alloy exhibited an enlarged B2-B19ʹ transformation thermal hysteresis of approximately 62 °C, in comparison to 40 °C of the solution-treated counterpart. The aged alloy also showed a high cycling stability during 100 thermal transformation cycles, with <1 °C variation of the martensitic transformation temperature as compared to the 20 °C decrement for the solution-treated sample under the same condition. The large thermal hysteresis and high cycling stability of the aged samples may be attributed to the short-range compositional heterogeneity and local lattice distortion which inhibit the interfacial motion and the mobility of dislocations during transformation cycles.

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时效引起的大热滞回和高循环稳定性

比较了Ni51Ti48.5Nb0.5 （at.%）合金固溶态和低温时效态的相变行为和热循环稳定性。由于B2的化学计量学中含有丰富的ni元素，低温时效导致B2团簇的形成，导致B2的无序和晶格畸变。结果表明，该合金的B2-B19′相变热滞后增大，约为62℃，而固溶处理的合金为40℃。时效合金在100次热转变循环中也表现出较高的循环稳定性，与相同条件下固溶处理样品的马氏体转变温度下降20℃相比，时效合金的马氏体转变温度变化了<；1℃。时效试样具有较大的热滞后和较高的循环稳定性，这可能是由于相变循环过程中成分的短程非均质性和局部晶格畸变抑制了界面运动和位错的迁移率。

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

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.