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

机译：表面轧制产生的梯度纳米晶纯Ti的变形和断裂机理

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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：通过表面滚轧处理制备了纳米级梯度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，相对于独立的纳米/超细晶粒钛，GNG Ti实现了强度和延展性的优化组合。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理。随着晶粒尺寸从粗颗粒（CG）减小到纳米/超细颗粒（NG / UFG）层，从传统的塑性变形机制（例如位错活性和孪晶形变）过渡到晶界介导的变形机制，例如应力诱导的晶粒长大。在拉伸变形的早期，微裂纹首先在CG和变形晶粒（DG）区域而不是NG / UFG区域中引发，并且CG / DG界面对裂纹扩展具有偏转作用。拉伸破坏后，断裂形态显示出韧性凹痕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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  • 正文语种 eng
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  • 关键词

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

    机译：纯钛纳米梯度晶粒变形机理断裂机理;

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