晶粒尺寸对纳米结晶镍钛合金析出和微应变的影响

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2024-11-12 DOI:10.1016/j.matchar.2024.114549

Penghui Li , Wang Tang , Qihang Shen , Xiaobin Shi , Ping Liu

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引用次数: 0

摘要

研究了时效处理对纳米晶镍钛合金微观结构、相变行为和力学性能的影响。不同晶粒大小的纳米晶镍钛合金是通过冷拔获得的，然后在 350-500 °C 下退火 10 分钟。退火后的样品在 250-400 ℃ 下进行 48 小时的时效处理。在平均纳米晶粒尺寸较小的样品中，析出物出现在晶界边缘，R 相基体中的晶格应变很小。在平均晶粒尺寸较大的样品中，析出物出现在纳米晶粒中，并与基体呈现出一致的界面。纳米晶 R 相镍钛基体在相干析出物末端表现出显著的压应力。在 500 °C 退火后于 250 °C 老化的样品中的相干析出物抑制了应力诱导的 R → B19′ 相变，并增加了上平台应力。350 ℃退火后 250 ℃老化的样品中的析出物无法有效抑制马氏体转变。

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Effect of grain size on precipitation and microstrain of nanocrystalline NiTi alloys

The effect of aging treatment on the microstructure, phase transformation behavior and mechanical properties of nanocrystalline NiTi alloy was studied. The nanocrystalline NiTi alloys with different grain sizes were acquired by cold drawing followed by annealing at 350–500 °C for 10 min. The annealed samples were aged at 250–400 °C for 48 h. The Ti₃Ni₄ precipitates were found in aged nanocrystalline NiTi alloys. In the sample with smaller average nanograin size, the precipitates were found at the edge of grain boundaries and little lattice strain was shown in R phase matrix. In the sample with larger average grain size, the precipitates were found in the nanograins and exhibited a coherent interface with the matrix. The nanocrystalline R phase NiTi matrix exhibited a significant compressive stress at the end of the coherent precipitate. The coherent precipitates in sample aged at 250 °C after annealing at 500 °C suppress the stress-induced R → B19′ phase transformation and increased the upper plateau stress. The precipitation in sample aged at 250 °C after annealing at 350 °C unable to suppress the martensitic transformation effectively.

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.