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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Micromechanical properties of WC-(W,Ti,Ta,Nb)C-Co composites
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Micromechanical properties of WC-(W,Ti,Ta,Nb)C-Co composites

机译：WC-（W，Ti，Ta，Nb）C-Co复合材料的微机械性能

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摘要

A deep knowledge of micromechanical properties of each constitutive phase of cemented carbides is crucial to improve their performance on the basis of microstructural design optimization. In the present work, a systematic experimental procedure has been followed to determine the intrinsic hardness of individual WC and (W,Ti,Ta,Nb)C particles, as well as that of the metallic binder, within a WC-Co composite containing a solid solution of mixed carbide as a third phase. In doing so, massive nanoindentation and statistical analysis of the gathered data are combined. Results showed that (W,Ti,Ta,Nb)C particles are significantly harder than WC ones, independent of the hardness anisotropy exhibited by the latter. Hardness assessment for the metallic binder required further analysis, including data deconvolution using thin film models and consideration of substrate effects. The attained hardness values are then used for estimation of effective flow stress of the metallic phase by means of Tabor's equation, yielding values ranging between 1.3 and 2.0 GPa. These high constraining-related values are finally validated by experimental assessment of stress levels at which strain bursts are identified in stress-strain curves obtained by uniaxial compression of micropillars. (C) 2018 Elsevier B.V. All rights reserved.
机译：深层知识碳化物碳化物的每个组成阶段的微机械性能是至关重要的，在基于微观结构设计优化的基础上提高它们的性能。在本作工作中，已经进行了系统的实验程序，以确定含有A的WC-Co复合材料中单个WC和（W，Ti，Ta，Nb）C颗粒以及金属粘合剂的内在硬度。混合碳化物作为第三阶段的固体溶液。在这样做时，组合了聚集数据的大规模纳米凸缘和统计分析。结果表明，（W，Ti，Ta，Nb）C颗粒显着比WC颗粒更难于WC，与后者呈现的硬度各向异性无关。金属粘合剂的硬度评估需要进一步的分析，包括使用薄膜模型和对基底效应的数据折耦合。然后使用达到的硬度值来估计金属相的有效流量应力，通过塔博尔方程，产生1.3和2.0GPa之间的值。通过对通过单轴压缩的微量微米获得的应力 - 应变曲线鉴定应变突发的实验评估，最终验证这些高约束相关值。 （c）2018年elestvier b.v.保留所有权利。

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