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首页> 外文期刊>Materials Science and Engineering >Activated slip systems in bimodal Ti-6Al-4V plastically deformed at low and moderately high temperatures
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Activated slip systems in bimodal Ti-6Al-4V plastically deformed at low and moderately high temperatures

机译：在双模TI-6AL-4V中激活的滑动系统在低和中等高温下塑性变形

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摘要

Activated slip systems were investigated by analyzing slip traces and measuring the distribution of the Schmid factor to understand the controlling mechanism behind the change in effective stress seen in bimodal Ti-6Al-4V. It was ascertained that both basal and prismatic slips are dominant at 77 K and 225 K. It was suggested that the critical resolved shear stress (CRSS) for basal and prismatic slips are close to each other at 77 K and 225 K. The activation of basal alongside prismatic slips was unexpected, owing to previous reports which determined that the CRSS of prismatic slips is lower than that of basal slips in single-phase Ti-6.6Al. It is presumed that the difference arises between single phase Ti-6.6Al and bimodal Ti-6Al-4V from the boundary of α/β interfaces in bimodal Ti-6Al-4V, which acts as obstacles for prismatic and pyramidal slips. In addition to those, it was found that pyramidal slips are dominant at 550 K in this study. The reasons for the higher activation of pyramidal slips in comparison with basal and prismatic slips at 550 K are also discussed. Present study evidenced that the change in the dominant active slip systems is responsible for the change in the trend of temperature dependence interpreted in the effective stress.
机译：通过分析滑动痕迹并测量施密因素的分布来研究激活的滑移系统，了解双峰TI-6AL-4V中有效应力变化背后的控制机制。确定了基础和棱柱形滑动率在77 k和225k中占主导地位。建议基础和棱柱形滑动的临界分离的剪切应力（CRS）在77k和225k处彼此接近。活化由于先前的报告，基础棱镜滑动是出乎意料的，这是由于先前的报道，这决定了棱柱滑动的CRS低于单相Ti-6.6的基础滑动的CRS。假设从双峰Ti-6Al-4V中的α/β接口边界之间的单相Ti-6.6AL和双相TI-6AL-4V之间出现差异，这起到棱柱形和金字塔滑动的障碍。除了那些之外，还发现金字塔滑动在本研究中的550 k处于占主导地位。还讨论了与550 k处的基础和棱柱形滑动相比，锥形滑动较高激活的原因。目前的研究证明，主导活性滑动系统的变化负责在有效应力中解释的温度依赖趋势的变化。

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  • 来源
    《Materials Science and Engineering》 |2020年第4期|140211.1-140211.9|共9页
  • 作者

    Bhargavi Rani Anne; Yelm Okuyama; Tatsuya Morikawa; Masaki Tanaka;

  • 作者单位

    Department of Materials Science and Engineering Kyushu University Nishi-ku Fukuoka 819-0395 Japan;

    Department of Materials Science and Engineering Kyushu University Nishi-ku Fukuoka 819-0395 Japan Department of Control Engineering Kisarazu College National Institute of Technology Kisarazu Chiba Japan 292-0041;

    Department of Materials Science and Engineering Kyushu University Nishi-ku Fukuoka 819-0395 Japan;

    Department of Materials Science and Engineering Kyushu University Nishi-ku Fukuoka 819-0395 Japan Center for Elements Strategy Initiative for Structural Materials Kyoto University Sakyo-ku Kyoto 606-8501 Japan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Bimodal Ti-6Al-4V; Critical resolved shear stress; Deformation mechanism; Schmid factor; Temperature dependence; Yielding;

    机译：双峰TI-6AL-4V;临界分辨剪切应力;变形机制;施密因素;温度依赖;屈服于;

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