Morphology of WC grains in WC-Co alloys:: Theoretical determination of grain shape

被引：86

作者：

Christensen, M. ^{[1
]}

Wahnstrom, G.

Lay, S.

Allibert, C. H.

机构：

[1] Chalmers, Dept Appl Phys, Gothenburg, Sweden

[2] Mat Design Inc, Angel Fire, NM USA

[3] Mat Design Inc, Le Mans, France

[4] UJF, INPG, UMR 5614,CNRS, Lab Thermodynam & Physicochim Met, F-38402 St Martin Dheres, France

来源：

ACTA MATERIALIA | 2007年 / 55卷 / 05期

关键词：

ab initio calculation; interfaces; cermets; microstructure;

D O I：

10.1016/j.actamat.2006.10.013

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A theoretical approach to predict grain morphology from interface energies computed using density-functional theory is presented and applied to the WC-Co system. The dependences of the WC grain shape on the geometrical misfit at the Co/WC metal-ceramic interface, and on the carbon chemical potential are investigated. The WC grains are predicted to be hexagonal when the interfaces are assumed to be coherent, and change to a truncated triangular shape where the long prism side lengths are five times longer than the short side lengths, when the interfaces are assumed to be incoherent. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：1515 / 1521

页数：7

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