Effects of Nb addition on the microstructure and martensitic transformation in NiTiHf-based high-temperature shape memory alloys

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL Intermetallics Pub Date : 2025-04-07 DOI:10.1016/j.intermet.2025.108790

Bing Liu , Xiangjun Zhou , A.V. Shuitcev , Mehrdad Zarinejad , Yunxiang Tong

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Abstract

This study investigates the microstructure and martensitic transformation of (Ni_50.3Ti_49.7-yHf_y)_100-xNb_x (x = 0, 5, 10 at. %; y = 10, 15, 20,25 at. %) alloys. The findings reveal that Nb addition significantly influences the alloy's microstructure. In Nb-containing alloys, β-Nb phase emerges alongside B19′ martensite and the Ti₂Ni-type phase at room temperature. Notably, the β-Nb phase adopts a spherical morphology in the Hf_yNb₅ alloys, whereas it becomes strip-shaped in the Hf_yNb₁₀ alloys. Nb addition also affects key properties, leading to an increase in transformation temperature and transformation hysteresis, as well as enhancements in hardness, tensile strength, and elongation. Furthermore, increasing Hf content elevates the transformation temperature, attributed to a linear reduction in valence electron concentration (C_v), while also improving microhardness. These results provide critical insights into tailoring the properties of Ni-Ti-Hf-Nb alloys for advanced applications.

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Nb添加对nitihf基高温形状记忆合金组织和马氏体相变的影响

研究了（Ni50.3Ti49.7-yHfy）100-xNbx （x = 0,5,10 at）的显微组织和马氏体相变。%;Y = 10,15,20,25at。%)合金。结果表明，Nb的加入对合金的显微组织有显著影响。在含nb合金中，室温下β-Nb相与B19′马氏体和ti2ni型相并存。值得注意的是，β-Nb相在HfyNb5合金中呈球形，而在HfyNb10合金中呈条形。Nb的加入也会影响关键性能，导致转变温度和转变滞后增加，以及硬度、抗拉强度和伸长率的提高。此外，Hf含量的增加提高了转变温度，这是由于价电子浓度（Cv）的线性降低，同时也提高了显微硬度。这些结果为定制Ni-Ti-Hf-Nb合金的高级应用性能提供了关键见解。

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来源期刊

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.