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首页> 外文期刊>Materials Science and Engineering >Coupling effect of stretch-bending deformation and electric pulse treatment on phase transformation behavior and superelasticity of a Ti-50.8 at.% Ni alloy
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Coupling effect of stretch-bending deformation and electric pulse treatment on phase transformation behavior and superelasticity of a Ti-50.8 at.% Ni alloy

机译：拉伸弯曲变形和电脉冲处理对Ti-50.8的相变性能和超弹性的耦合效应。％Ni合金

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摘要

In order to improve the functional stability of Ti-50.8 at.% Ni alloy, repeated stretch-bending deformation (SBD), electric pulse (EP), and age-hardening were combined. Phase transformation behavior and superelastic properties of NiTi alloy subjected to different treatments were compared and analyzed in terms of average gTain size, dislocation morphology, and nanoscaled Ni_4Ti_3 precipitates. The results indicate that the average grain size was refined from the annealing state of 9.1 μm down to 5.4 μm, and that a certain amount of dislocations or dislocation networks were introduced via 7 SBD passes. As EP-processed, both local stress relaxation and the non-uniform temperature field facilitated the microstructure to be a more homogeneous and stable state. With the increase of pulse frequency from 150 Hz to 400 Hz, a two-stage martensitic transformation occurred to replace the one-stage phase transformation and the combined multi-process induced multi-stage martensitic transformation behavior. Nanoscaled Ni_4Ti_3 precipitates with sizes in the range of 20-40 nm were homogeneously distributed in the matrix of NiTi alloy after aging at 250°C for 48 h. As a result, based on the coupling effect of "Annealing-SBD-150 Hz EP-aging", excellent functional stability was obtained. The accumulative residual strain was reduced from the annealing state of 3.6%-1.1%.
机译：为了改善Ti-50.8的功能稳定性。％Ni合金，重复拉伸弯曲变形（SBD），电脉冲（EP）和年龄硬化。比较了对不同治疗的NITI合金的相转化行为和超弹性性能，并在平均GTAIN尺寸，位错形态和纳米级Ni_4Ti_3沉淀物方面进行分析。结果表明，平均晶粒尺寸从9.1μm的退火状态改进到5.4μm，并通过7 SBD通过引入一定量的脱位或位错网络。作为EP处理，局部应力松弛和非均匀温度场都促进了微观结构是更均匀且稳定的状态。随着脉冲频率的增加，从150 Hz到400Hz，发生了两级的马氏体转换，以取代单级相变，组合的多过程诱导的多阶段马氏体转换行为。在250℃下老化48小时后，纳米级Ni_4Ti_3在20-40nm的范围内均匀分布在Niti合金的基质中。结果，基于“退火-SBD-150Hz Ep-ageging”的偶联效果，获得了优异的功能稳定性。从退火状态减少3.6％-1.1％的累积残留菌株。

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  • 来源
    《Materials Science and Engineering》 |2021年第2期|140164.1-140164.10|共10页
  • 作者

    Shan Liu; Jie Zhu; Xudong Lin; Xiebin Wang; Guangchun Wang;

  • 作者单位

    Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education) Shandong University Jinan Shandong 250061 PR China;

    Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education) Shandong University Jinan Shandong 250061 PR China;

    Chongqing Academy of Science and Technology Chongqing 401123 PR China;

    Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education) Shandong University Jinan Shandong 250061 PR China;

    Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education) Shandong University Jinan Shandong 250061 PR China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Shape memory alloy; NiTi; Plastic deformation; Electric pulse; Age-hardening; Superelasticity;

    机译：形状记忆合金;niti;塑性变形;电脉冲;年龄硬化;超弹性;

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