Estimation of surface energy and bonding between AlMgB14 and TiB2

被引：11

作者：

Cook, B. A. ^{[1
]}

Russell, A. M. ^{[2
]}

Peters, J. ^{[1
]}

Harringa, J. L. ^{[1
]}

机构：

[1] Iowa State Univ, Div Engn & Mat Sci, Ames Lab, Ames, IA 50010 USA

[2] Iowa State Univ, Dept Mat Sci & Engn, Ames, IA 50011 USA

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2010年 / 71卷 / 05期

关键词：

Ceramics; Interfaces; Fracture;

D O I：

10.1016/j.jpcs.2010.02.009

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Composites of AlMgB14 with TiB2 display a positive deviation from the rule-of-mixtures for hardness and wear resistance [1] (Ahmed et al., 2006). This suggests exceptionally strong bonding between the two boride phases. A contributing factor to the strong bonding may be a close matching of surface energy in the two phases. A calculation was performed to estimate the surface energy and its temperature dependence in AlMgB14, based on the critical crack energy release rate and assuming covalent bonding. Results predict that the surface energy of the two phases differs by about 0.4 J/m(2). Similar results were found for other transition metal diborides, and the surface energy of AlMgB14 was close to that of TiC and TiN, two materials commonly used as sintering aids for TiB2. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：824 / 826

页数：3

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