Atomic-scale microstructure and elastic properties of quaternary Zr-Al-Si-C ceramics

被引：50

作者：

Lin, Z. J. ^{[1
,2
]}

He, L. F. ^{[1
,2
]}

Wang, J. Y. ^{[1
]}

Li, M. S. ^{[1
]}

Bao, Y. W. ^{[1
]}

Zhou, Y. C. ^{[1
]}

机构：

[1] Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China

[2] Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China

来源：

ACTA MATERIALIA | 2008年 / 56卷 / 09期

基金：

中国国家自然科学基金;

关键词：

ceramics; hot-pressing; crystal structure; TEM; elastic property;

D O I：

10.1016/j.actamat.2007.12.055

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Transmission electron microscopy characterizations and elastic properties of two quaternary carbides, i.e. Zr2(Al(Si))(4) C-5 and Zr-3(Al(Si))(4)C-6 are reported. The space group and atomic-scale microstructures of both compounds were determined using a combination of selected area electron diffraction, convergent beam electron diffraction, high-resolution transmission electron microscopy and Z-contrast scanning transmission electron microscopy. In addition, the combined experimental and theoretical studies on elastic properties for Zr-2(Al(Si))(4)C-5 are presented. A full set of second-order elastic constants, bulk modulus, shear modulus, and Young's modulus were calculated using first-principles calculations. Both experimental and theoretical works demonstrated that quaternary Zr-Al-Si-C ceramics possess close elastic properties to ZrC. Furthermore, Zr-2(Al(Si))(4)C-5 retained a high Young's modulus up to about 1580 degrees C, which can be attributed to its comparable activation energy of lattice drag process to that of ZrC. (c) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：2022 / 2031

页数：10

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