Hall-Petch strengthening of the constrained metallic binder in WC-Co cemented carbides: Experimental assessment by means of massive nanoindentation and statistical analysis
Hall-Petch strengthening of the constrained metallic binder in WC-Co cemented carbides: Experimental assessment by means of massive nanoindentation and statistical analysis
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DOI：
10.1016/j.msea.2016.09.020
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发表时间：
2016-10-31
期刊：
影响因子：
6.4
通讯作者：
Llanes, L.
中科院分区：
文献类型：
--
作者：
Roa, J. J.;Jimenez-Pique, E.;Llanes, L.
WC-Co硬质合金是一种几何形状复杂的复合材料，由陶瓷相和金属相组成的两个互穿网络构成。因此，评估微观结构对每个相的局部机械性能的影响是一项具有挑战性的任务，特别是对于金属粘结剂。在这项工作中，它是试图通过结合大量的纳米压痕，统计分析，和实施的薄膜模型的固有硬度和流动应力的金属相的去卷积。屈服应力值作为粘结剂平均自由程的函数的绘图导致Hall-Petch强化关系，斜率（K-y）为0.98 MPa m（1/2）。该值指出了WC-Co相边界作为滑移传播的强障碍的有效性;因此，通过裂纹桥接延性（Co）增强来韧化脆性相（WC）。(C)2016爱思唯尔B. V.保留所有权利。
WC-Co cemented carbides are geometrically complex composites constituted for two interpenetrating networks of the constitutive ceramic and metal phases. Accordingly, assessment of microstructural effects on the local mechanical properties of each phase is a challenging task, especially for the metallic binder. In this work, it is attempted by combining massive nanoindentation, statistical analysis, and implementation of a thin film model for deconvolution of the intrinsic hardness and flow stress of the metallic phase. Plotting of yield stress values as a function of the binder mean free path results in a Hall-Petch strengthening relationship with a slope (K-y) of 0.98 MPa m(1/2). This value points out the effectiveness of WC-Co phase boundaries as strong obstacles to slip propagation; and thus, for toughening of the brittle phase (WC) by means of crack-bridging ductile (Co) reinforcement. (C) 2016 Elsevier B.V. All rights reserved.