Grain size dependence of hardness and fracture toughness in pure near fully-dense boron carbide ceramics

被引：121

作者：

Moshtaghioun, Bibi Malmal ^{[1
,2
]}

Gomez-Garcia, Diego ^{[1
]}

Dominguez-Rodriguez, Arturo ^{[1
]}

Todd, Richard I. ^{[2
]}

机构：

[1] Univ Seville, Dept Condensed Mater Phys, PO 1065, E-41012 Seville, Spain

[2] Univ Oxford, Dept Mat, Oxford OX1 3PH, England

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2016年 / 36卷 / 07期

关键词：

Boron carbide; Hardness; Fracture toughness; SEVNB test; MINIMUM SOLID AREA; VICKERS INDENTATION; NANOCRYSTALLINE MATERIALS; B4C; DEFORMATION; BEHAVIOR; MODELS;

D O I：

10.1016/j.jeurceramsoc.2016.01.017

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Room temperature fracture toughness and hardness of spark plasma sintered pure B4C ceramics with grain sizes ranging from 120 nm to 17 mu m have been studied. Vickers indentation and single edge V-notched beam (SEVNB) techniques have been used to measure hardness and fracture toughness, respectively. A critical analysis of the results derived from these two techniques has been carried out and the conditions for proper comparison of the derived results are discussed. The results have shown that hardness follows the Hall-Petch dependence with either grain size or twin spacing when the effect of porosity is corrected for. On the contrary, fracture toughness is found to be essentially grain size independent. The value of this quantity is similar to 2 MPa m(1/2). (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：1829 / 1834

页数：6

共 37 条

[1] A CRITICAL-EVALUATION OF INDENTATION TECHNIQUES FOR MEASURING FRACTURE-TOUGHNESS .1. DIRECT CRACK MEASUREMENTS [J].