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Berkovich nanoindentation and deformation mechanisms in a hardmetal binder-like cobalt alloy

机译：硬质金属粘结剂状钴合金的Berkovich纳米压痕和变形机理

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摘要

A cobalt-base solid solution is the most used binder for hardmetals (WC-Co cemented carbides) in a wide range of industrial applications. In the composite material such cobalt alloy is surrounded by hard carbides grains; thus, a direct evaluation of its intrinsic mechanical properties is not an easy task. In order to overcome this inconvenience, a model cobalt alloy with a composition similar to that exhibited by typical hardmetal binder (containing W and C in solid solution) was processed following a powder metallurgy route. Nanoindentation testing at different length scales has been performed to study the mechanical properties as well as to introduce plastic deformation in individual grains of the dilute face centered cubic (fcc) stabilized model Co-W-C alloy. It is found that it exhibits an isotropic mechanical response, without any evidence of indentation size effects. The main deformation mechanism activated during the indentation tests resulted to be deformation twinning, although combined with limited planar slip but with no evidence of stress-induced phase transformation. Such finding is related to the high W and C amounts dissolved in the model Co alloy studied, and its effect on stabilizing the fcc configuration and increasing the stacking fault energy. The effective use of small-length scale mechanical characterization protocols is finally discussed for understanding deformation response of binder-like alloys and optimizing microstructural design of hardmetals.
机译：钴基固溶体是在广泛的工业应用中最常用于硬质合金（WC-Co硬质合金）的粘合剂。在复合材料中，这种钴合金被硬质碳化物晶粒包围；因此，直接评估其固有的机械性能并非易事。为了克服这种不便，按照粉末冶金路线处理了具有与典型硬质金属粘结剂（固溶体中含有W和C）相似的组成的模型钴合金。已经进行了不同长度尺度的纳米压痕测试，以研究机械性能以及在稀面中心立方（fcc）稳定模型Co-W-C合金的单个晶粒中引入塑性变形。发现它表现出各向同性的机械响应，没有任何痕迹尺寸影响的证据。在压痕测试中激活的主要变形机制是变形孪生，尽管结合了有限的平面滑移，但没有应力引起的相变的迹象。这种发现与所研究的模型Co合金中溶解的高W和C量有关，并且对稳定fcc构型和增加堆垛层错能有影响。最后讨论了小尺寸力学表征协议的有效使用，以理解粘合剂状合金的变形响应并优化硬质合金的微观结构设计。

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  • 来源
    《Materials Science and Engineering》 |2015年第5期|128-132|共5页
  • 作者

    J.J. Roa; E. Jimenez-Pique; J.M. Tarrago; M. Zivcec; C. Broeckmann; L. Llanes;

  • 作者单位

    CIEFMA-Departament de Ciencia dels Materials i Enginyeria Metal • lurgica, ETSEIB, Universitat Politecnica de Catalunya, Avda. Diagonal 647, 08028 Barcelona, Spain,CRnE, Campus Diagonal Sud, Edifici C', Universitat Politecnica de Catalunya, C/Pascual i Vila 15, 08028 Barcelona, Spain;

    CIEFMA-Departament de Ciencia dels Materials i Enginyeria Metal • lurgica, ETSEIB, Universitat Politecnica de Catalunya, Avda. Diagonal 647, 08028 Barcelona, Spain,CRnE, Campus Diagonal Sud, Edifici C', Universitat Politecnica de Catalunya, C/Pascual i Vila 15, 08028 Barcelona, Spain;

    CIEFMA-Departament de Ciencia dels Materials i Enginyeria Metal • lurgica, ETSEIB, Universitat Politecnica de Catalunya, Avda. Diagonal 647, 08028 Barcelona, Spain,CRnE, Campus Diagonal Sud, Edifici C', Universitat Politecnica de Catalunya, C/Pascual i Vila 15, 08028 Barcelona, Spain;

    IWM - Institute for Materials Applications in Mechanical Engineering, RWTH Aachen University, 52062 Aachen, Germany;

    IWM - Institute for Materials Applications in Mechanical Engineering, RWTH Aachen University, 52062 Aachen, Germany;

    CIEFMA-Departament de Ciencia dels Materials i Enginyeria Metal • lurgica, ETSEIB, Universitat Politecnica de Catalunya, Avda. Diagonal 647, 08028 Barcelona, Spain,CRnE, Campus Diagonal Sud, Edifici C', Universitat Politecnica de Catalunya, C/Pascual i Vila 15, 08028 Barcelona, Spain;

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  • 关键词

    Hardmetal binder alloy; Hardness; Elastic modulus; Plastic deformation; Mechanical twinning;

    机译：硬质合金粘结剂合金;硬度;弹性模量塑性变形;机械孪生;

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