WC-Co 复合材料的硬度和强度特性

The Hardness and Strength Properties of WC-Co Composites.

作者信息

Armstrong Ronald W

机构信息

Center for Energetic Concepts Development, Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA.

出版信息

Materials (Basel). 2011 Jul 14;4(7):1287-1308. doi: 10.3390/ma4071287.

DOI:10.3390/ma4071287

PMID:28824143

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5448685/

Abstract

The industrially-important WC-Co composite materials provide a useful, albeit complicated materials system for understanding the combined influences on hardness and strength properties of the constituent WC particle strengths, the particle sizes, their contiguities, and of Co binder hardness and mean free paths, and in total, the volume fraction of constituents. A connection is made here between the composite material properties, especially including the material fracture toughness, and the several materials-type considerations of: (1) related hardness stress-strain behaviors; (2) dislocation (viscoplastic) thermal activation characterizations; (3) Hall-Petch type reciprocal square root of particle or grain size dependencies; and (4) indentation and conventional fracture mechanics results. Related behaviors of MgO and Al₂O₃ crystal and polycrystal materials are also described for the purpose of making comparisons.

摘要

具有重要工业价值的WC-Co复合材料提供了一个有用的材料体系，尽管较为复杂，可用于理解WC颗粒强度、颗粒尺寸、颗粒邻接性以及Co粘结剂硬度和平均自由程对硬度和强度性能的综合影响，以及各组分的总体积分数。本文建立了复合材料性能之间的联系，特别是包括材料断裂韧性，以及以下几种材料类型的考虑因素：（1）相关硬度应力-应变行为；（2）位错（粘塑性）热激活特性；（3）颗粒或晶粒尺寸依赖性的Hall-Petch型倒数平方根；（4）压痕和传统断裂力学结果。为了进行比较，还描述了MgO和Al₂O₃晶体及多晶体材料的相关行为。