控制位错分布诱导纳米Ni4Ti3均匀性，提高Ti-50.8 at的超弹性。% Ni合金

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2025-09-02 DOI:10.1016/j.intermet.2025.108972

Yongqiang Yu , Xiaofeng Xu , Chao Wu , Xudong Yan , Yachong Zhou , Zhicheng Wu , Lai Wei , Zhihui Zhang

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引用次数: 0

摘要

纳米Ni4Ti3析出相的均匀分布对提高NiTi合金的超弹性具有重要作用。本研究采用电脉冲处理（EPT）控制Ti-50.8 at中的位错分布。% Ni合金。在180 ms EPT后，在均匀分布的亚晶界内产生了位错网络。低温时效（250℃，8 h）得到分布均匀的纳米Ni4Ti3析出物。结果表明，180 ms EPT诱导的位错构型增加了Ni4Ti3的形核位置，促进了Ni4Ti3的均匀析出。从而获得了较高的超弹性稳定性。250℃时效8 h后，EPT180+时效试样在20次加载-卸载循环后的残余应变为0.55%，明显低于接收试样（2.15%，20次循环）和热处理+时效试样（2.21%，20次循环）。

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Homogeneity of nano-sized Ni4Ti3 induced by dislocation distribution control to improve superelasticity in Ti-50.8 at.% Ni alloy

The homogeneous distribution of nano-sized Ni₄Ti₃ precipitates plays an important role in improving the superelasticity of NiTi alloys. In this study, electropulsing treatment (EPT) was utilized to control the dislocation distribution in Ti-50.8 at.% Ni alloy. A dislocation configuration with dislocation networks within the uniformly distributed subgrain boundaries was produced after 180 ms EPT. Homogeneously distributed nano-sized Ni₄Ti₃ precipitates were obtained after low-temperature aging (250 °C for 8 h). It was found that the dislocation configuration induced by 180 ms EPT could increase the nucleation site and promote the uniform precipitation of Ni₄Ti₃. Thus the high superelastic stability was achieved. After aging at 250 °C for 8 h, the residual strain of the EPT180+aging sample was 0.55 % after 20 loading-unloading cycles, obviously lower than that of the as-received (2.15 %, 20 cycles) and heat treatment + aging samples (2.21 %, 20 cycles).

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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.