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首页> 外文会议>Nanomaterials by Severe Plastic Deformation IV >Thermal Stability of Severe Plastically Deformed VT-6 (Ti-6AI-4V)
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Thermal Stability of Severe Plastically Deformed VT-6 (Ti-6AI-4V)

机译：严重塑性变形的VT-6（Ti-6AI-4V）的热稳定性

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摘要

The thermal stability of equal channel angular extruded VT-6(Ti-6Al-4V) has been examined using micro-hardness, nano-hardness of the individual aand p phases backscattered scanning (BSEI) and transmission electron microscopy (TEM). After straining to an equivalent total equivalent of 6.5 samples were annealed for 1 h at temperatures between 175 and 800℃ followed by water quenching. Micro and nano-hardness measurements showed an initial hardness increase, the former rising to a maximum at 175℃, while the latter exhibited a maximum at 500℃. BSEI and TEM analysis showed that these observations can be understood by considering the microstructure changes occurring at different length scales. Annealing in the temperature range of 175 to 500℃ did not significantly alter the a and (3 particle size, while TEM showed that recovery and continuous recrystallization occurred in the a phase, higher temperatures being required to activate the recovery and recrystallization processes within the p phase. Finally at temperatures above 600℃ spheroidization and growth of the β phase occurred with the volume fraction of this phase increasing from 15 pet at lower temperature to 25 pet at 800℃, an equi-axed a+ β microstructure being observed at this temperature.
机译：使用显微硬度，单个a相和p相反向散射扫描（BSEI）和透射电子显微镜（TEM）的纳米硬度，检查了等通道角挤压VT-6（Ti-6Al-4V）的热稳定性。过滤至等效的总当量6.5后，将样品在175至800℃之间的温度下退火1小时，然后进行水淬。显微和纳米硬度测量显示出初始硬度增加，前者在175℃时升高到最大值，而后者在500℃时显示最大值。 BSEI和TEM分析表明，通过考虑在不同长度范围内发生的微观结构变化，可以理解这些观察结果。在175至500℃的温度范围内进行退火并没有显着改变a和（3）的粒径，而TEM显示出a相中发生了恢复和连续重结晶，需要更高的温度来活化p内的恢复和重结晶过程。最后，在高于600℃的温度下，发生了球化和β相的生长，该相的体积分数从低温下的15 pet增加到800℃下的25 pet，在该温度下观察到了等轴的a +β微观结构。

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  • 来源
  • 会议地点 Goslar(DE)
  • 作者

    H. J. Rack; J. Qazi; L. Allard; R. Valiev;

  • 作者单位

    School of Materials Science and Engineering, Clemson University, Clemson, SC 29634, USA;

    Formerly School of Materials Science and Engineering, currently, KEMET Electronics Corporation, 2835 KEMET Way, Simpsonville, SC 29681 USA;

    Oak Ridge National Laboratory, 1 Bethel Valley Rd., Building 4515, MS 6064 Oak Ridge, TN 37831-6064;

    Institute of Advanced Materials, Ufa State Aviation Technical University, Ufa, 45000 Russia;

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

    VT-6(Ti-6Al-4V); annealing; recovery; continuous recrystallization;

    机译：VT-6（Ti-6Al-4V）;退火;复苏;连续重结晶;

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