WC-base cemented carbides with partial and total substitution of Co as binder: Evaluation of mechanical response by means of uniaxial compression of micropillars |
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| Affiliation: | 1. CIEFMA-Departament de Ciència dels Materials i Enginyeria Metal·lúrgica, EEBE, Universitat Politècnica de Catalunya, Barcelona, Spain;2. Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, Bsarcelona, Spain;3. Italian National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA), Rome, Italy;4. Institute for Photonics and Nanotechnologies – CNR (National Research Council of Italy), Rome, Italy;5. Hyperion Materials & Technologies, Martorelles, Spain;1. National University of Science and Technology “MISiS”, Leninsky pr. 4, Moscow 119049, Russia;2. Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics”, Russian Academy of Sciences, Leninskiy pr. 59, Moscow 119333, Russia;3. National Research Centre “Kurchatov Institute”, Akademika Kurchatova pl. 1, Moscow 123182, Russia;1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;2. Changsha Mining and Metallurgy Research Institute Co., Ltd., Changsha 410012, China;3. State Key Laboratory of Cemented Carbide, Zhuzhou 412000, China;4. Zhuzhou Cemented Carbide Group Corp. Ltd., Zhuzhou 412000, China;1. Hyperion Materials & Technologies, Pol. Ind. Roca - C/Verneda 12-24, 08107 Martorelles, Spain;2. Micro Materials Ltd, Willow House, Yale Business Village, Ellice Way, Wrexham LL13 7YL, UK;1. Element Six GmbH, Städeweg 12 – 24, 36151, Burghaun, Germany;2. National University of Science and Technology MISIS, Leninsky pr. 4, 119049 Moscow, Russia;3. Joint-Stock Company VNIIINSTRUMET and Kirovgrad Hardmetal Plant, Warshavskoye Highway, 56, Moscow, 117638, Russia |
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| Abstract: | The influence of the chemical nature of the metallic binder on the plastic deformation of cemented carbides was studied. Three different cemented carbide grades - WC-Co, WC-CoNi and WC-NiMo - with similar microstructural characteristics (binder content and carbide grain size) were investigated. Mechanical response was evaluated by means of uniaxial compression of micropillars, and tests were carried out in-situ in a FESEM with a nanoindenter equipped with a flat-diamond punch. After uniaxial compression, inspection of deformation phenomena was done at both surface and bulk of micropillars through scanning and transmission electron microscopy, respectively. It is found that yielding phenomena and strain hardening increase as Co is totally substituted by a NiMo alloy, while contrary effect results from partial replacement of Co with Ni. Relative differences are directly linked to intrinsic ductility of the metallic phase and operative plastic deformation mechanisms. Moreover, for the three materials studied, stress-strain responses show pronounced yielding events related to glide at WC/WC interfaces. Although they are discerned at different stress levels, estimated values of sliding resistance of WC/WC boundaries are found to be alike for the three grades studied. |
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