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In-situ investigation on tensile deformation and fracture behaviors of a new metastable β titanium alloy

机译：一种新型亚稳β钛合金拉伸变形和断裂行为的原位研究

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摘要

The tensile deformation and fracture behaviors of a new metastable |) titanium alloy (Ti-5Cr-4Al-4Zr-3Mo-2W-0.8Fe) with single β phase are investigated by in-situ tensile test under scanning electron microscopy. With the increase of deformation degree, in addition to the transition from single slip to multiple slip, the stress induced martensite (SIM) and mechanical twins will also occur to coordinate the overall deformation of the alloy, leading to further work hardening. The slip system activation, slip transfer and grain rotation are closely related to the crystallographic orientation, which can be evaluated by Schmid factor, geometric compatibility factor and misorientation. The dislocation pile-up leads to serious stress concentration and inhomogeneous deformation appeared in the areas near grain boundary, dislocation line and shear band, and the microvoids are easy to nucleate and grow in the above areas and then coalescence into microcracks. The primary crack formed by microcrack extension propagates along the activated slip system in the grain, and deflects as it passes through the grain boundary to coordinate the slip system in the adjacent grain, resulting in the overall crack propagation path being zigzag. Considering the damage prone location and crack propagation path, it can be concluded that the fracture mechanism of the alloy belongs to the intergranular and transgranular mixture.
机译：通过在扫描电子显微镜下的原位拉伸试验研究了新的亚稳态合金（Ti-5Cr-4AL-4ZR-3MO-0.8FE）的抗拉性变形和断裂行为，采用单β相进行研究。随着变形程度的增加，除了从单滑移到多次滑移的过渡之外，还会发生应力诱导的马氏体（SIM）和机械双胞胎，以协调合金的整体变形，导致进一步的工作硬化。滑动系统激活，滑动转移和晶粒旋转与晶体取向密切相关，可以通过施突因子，几何相容性因子和错误来评估。脱位堆积导致严重的应力浓度，并且在晶界，位错线和剪切带附近的区域中出现了不均匀变形，并且微系体易于成核并在上述区域生长，然后聚集成微裂纹。通过微裂纹延伸形成的主裂缝沿着晶粒中的活化滑动系统传播，并且在通过晶粒边界时偏转以协调相邻晶粒中的滑动系统，导致总裂纹传播路径是曲折。考虑到损伤的位置和裂纹传播路径，可以得出结论，合金的断裂机制属于晶间和晶状体混合物。

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  • 来源
    《Materials Science and Engineering》 |2021年第2期|140187.1-140187.12|共12页
  • 作者

    Jing Wang; Yongqing Zhao; Wei Zhou; Qinyang Zhao; Shixing Huang; Weidong Zeng;

  • 作者单位

    State Key Laboratory of Solidification Processing School of Materials Science and Engineering Northwestern Polytechnical University Xi 'an 710072 China Northwest Institute for Nonferrous Metal Research Xi'an 710016 China;

    State Key Laboratory of Solidification Processing School of Materials Science and Engineering Northwestern Polytechnical University Xi 'an 710072 China Northwest Institute for Nonferrous Metal Research Xi'an 710016 China;

    Northwest Institute for Nonferrous Metal Research Xi'an 710016 China;

    School of Material Science and Engineering Chang'an University Xi'an 710064 China;

    Northwest Institute for Nonferrous Metal Research Xi'an 710016 China;

    State Key Laboratory of Solidification Processing School of Materials Science and Engineering Northwestern Polytechnical University Xi 'an 710072 China;

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  • 正文语种 eng
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  • 关键词

    Metastable β titanium alloy; In-situ SEM; Slip transfer; Crack propagation; Fracture mechanism;

    机译：亚稳β钛合金;原位SEM;滑动转移;裂缝繁殖;骨折机制;

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