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Deformation and fracture mechanisms of gradient nanograined pure Ti produced by a surface rolling treatment

机译：表面滚动处理产生的梯度纳米纯Ti的变形和断裂机制

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摘要

Gradient nanograined Ti (GNG Ti) samples were produced by a surface rolling treatment. The mechanical properties were evaluated by microhardness and tensile tests. The results indicated that GNG Ti achieved an optimized combination of strength and ductility relative to the free-standing nano/ultrafine-grained Ti. The deformation and fracture mechanisms were studied using transmission electron microscope (TEM) and scanning electron microscope (SEM). As the grain size reduced from the coarse-grained (CG) matrix to the nano/ultrafinegrained (NG/UFG) layer, the transition from conventional plastic deformation mechanisms, such as dislocation activity and twinning deformation, to grain boundary-mediated deformation mechanisms, such as stress-inducing grain growth, was identified. At the early stage of tensile deformation, the microcracks were first initiated in the CG and deformed grain (DG) regions rather than in the NG/UFG region and the CG/DG interface had a deflection effect on crack propagation. After tensile failure, the fracture morphology showed a mixture of ductile dimples and shear band-like regions.
机译：通过表面滚动处理产生梯度纳米甲基Ti（GNG TI）样品。通过显微硬度和拉伸试验评估机械性能。结果表明，GNG TI相对于独立式纳米/超细晶粒Ti实现了优化的强度和延展性组合。使用透射电子显微镜（TEM）和扫描电子显微镜（SEM）研究了变形和断裂机制。随着从粗粒（CG）基质的粒度从纳米/超细（Ng / UFG）层的减少，从传统的塑性变形机构（例如位错活性和孪晶变形）的过渡到晶界介导的变形机制，鉴定了诱导应激晶粒生长。在拉伸变形的早期阶段，首先在Cg和变形的晶粒（DG）区域中首先引发微裂纹，而不是在Ng / UFG区域中，CG / DG界面对裂纹繁殖具有偏转效应。拉伸失效后，裂缝形态显示延性凹槽和剪切带状区域的混合物。

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  • 来源
    《Materials Science and Engineering》 |2019年第29期|121-128|共8页
  • 作者

    Wang Qi; Ren Junqiang; Wang Yinling; Xin Chao; Xiao Lin; Yang Dan;

  • 作者单位

    Huanghuai Univ Zhumadian 463000 Henan Peoples R China;

    Lanzhou Univ Technol State Key Lab Adv Proc & Recycling Nonferrous Met Lanzhou 730050 Gansu Peoples R China;

    Huanghuai Univ Zhumadian 463000 Henan Peoples R China;

    Xi An Jiao Tong Univ State Key Lab Mech Behav Mat Xian 710049 Shaanxi Peoples R China;

    Xi An Jiao Tong Univ State Key Lab Mech Behav Mat Xian 710049 Shaanxi Peoples R China;

    Lanzhou Univ Technol State Key Lab Adv Proc & Recycling Nonferrous Met Lanzhou 730050 Gansu Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Pure titanium; Gradient nanograined; Deformation mechanism; Fracture mechanism;

    机译：纯钛;梯度纳米;变形机制;骨折机制;

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