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Intrinsic hardness of constitutive phases in WC-Co composites: Nanoindentation testing, statistical analysis, WC crystal orientation effects and flow stress for the constrained metallic binder

机译:WC-Co复合材料中本构相的本征硬度:纳米压痕测试,统计分析,WC晶体取向效应和受限金属粘结剂的流动应力

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摘要

The intrinsic hardness of the constitutive phases in WC-Co composites is investigated by combining experimental and statistical analysis nanoindentation techniques. It is done on the basis of considering the cemented carbide material as effectively heterogeneous at the microstructure scale, i.e. consisting of three phases defined by either different chemical nature (carbides and binder) or distinct carbide crystal orientation (i.e. with surface normal perpendicular to either basal or prismatic planes). As main outcome, experimentally measured and statistically significant intrinsic hardness values for the defined phases (WC and constrained metallic binder) are analyzed and determined. Besides the evidence of crystal anisotropy for the WC phase, they permit to identify and account the expected strengthening of the plastic-constrained metallic binder, a critical input parameter for hardness and toughness modelling as well as for microstructural design optimization of ceramic composites reinforced by ductile metallic ligaments. (C) 2015 Elsevier Ltd. All rights reserved.
机译:通过结合实验和统计分析纳米压痕技术,研究了WC-Co复合材料本构相的固有硬度。它是在考虑到硬质合金材料在微观结构尺度上有效地异质性的基础上完成的,即由由不同化学性质(碳化物和粘合剂)或不同碳化物晶体取向(即表面法线垂直于任一基体)定义的三相组成或棱柱形平面)。作为主要结果,分析和确定了确定相(WC和受约束的金属粘结剂)的实验测量值和统计学上显着的固有硬度值。除了WC相具有晶体各向异性的证据外,它们还可以识别并考虑塑性约束金属粘结剂的预期强化作用,硬度和韧性建模以及延性增强陶瓷复合材料的微观结构设计优化的关键输入参数。金属韧带。 (C)2015 Elsevier Ltd.保留所有权利。

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