Grain growth in Ni50Ti30Hf20 high-temperature shape memory alloy processed by high-pressure torsion

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A Pub Date : 2024-10-29 DOI:10.1016/j.msea.2024.147478

A.V. Shuitcev , Y. Ren , D.V. Gunderov , R.N. Vasin , L. Li , R.Z. Valiev , Y.F. Zheng , Y.X. Tong

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引用次数: 0

Abstract

Grain refinement and precipitation hardening play critical important role for stabilization and improving functional properties of shape memory alloys. However, the relationship between precipitation and nanocrystalline grain growth behavior in NiTiHf alloys is still unclear. This work aims to investigate the role of precipitation in the nanocrystalline grain growth behavior of HPT-processed Ni₅₀Ti₃₀Hf₂₀ high-temperature shape memory alloy. An abnormally low grain growth rate (n = 0.08) was observed after post-deformation annealing (PDA) at 550 °C for 1 h. It was proposed that grain growth suppression may be caused by the presence of relatively large H-phase precipitates, which act as barriers to grain boundary movement. A detailed analysis of the grain growth kinetics during PDA suggests that the coarsening process is controlled by Ni diffusion. Additionally, the dependence of strength and transformation temperatures on grain size in NiTiHf alloy is found to follow the Hall-Petch relation with some exceptions due to H-phase precipitation. The results of this research may be useful for the development of methods and strategies to stabilize the nanocrystalline structure in metallic materials.

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通过高压扭转加工的 Ni50Ti30Hf20 高温形状记忆合金中的晶粒生长

晶粒细化和沉淀硬化对稳定和改善形状记忆合金的功能特性起着至关重要的作用。然而，镍钛铪合金中沉淀与纳米晶粒生长行为之间的关系仍不清楚。本研究旨在探讨析出在 HPT 加工的 Ni50Ti30Hf20 高温形状记忆合金的纳米晶晶粒生长行为中的作用。在 550 °C 下进行 1 小时的形变后退火（PDA）后，观察到异常低的晶粒生长率（n = 0.08）。研究人员提出，晶粒生长受抑制可能是由于存在相对较大的 H 相沉淀物，这些沉淀物阻碍了晶界运动。对 PDA 过程中晶粒生长动力学的详细分析表明，粗化过程是由镍扩散控制的。此外，还发现镍钛铪合金的强度和转变温度与晶粒大小的关系遵循霍尔-佩奇关系，但由于 H 相析出的缘故，存在一些例外情况。这项研究的结果可能有助于开发稳定金属材料中纳米晶结构的方法和策略。

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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.