Microstructure and mechanical and thermal properties of ternary carbides in Hf-Al-C system

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	Microstructure and mechanical and thermal properties of ternary carbides in Hf-Al-C system
	L. F. He; Y. W. Bao; J. Y. Wang; M. S. Li; Y. C. Zhou
	2009
发表期刊	Acta Materialia
ISSN	1359-6454
卷号	57 期号:9 页码:2765-2774
摘要	A Hf-Al-C composite composed of Hf(3)Al(3)C(5), Hf(2)Al(4)C(5) and Hf(3)Al(4)C(6) has been successfully synthesized by a hot pressing method; its microstructure and mechanical and thermal properties were systematically characterized. Hf-Al-C composite conserves the high hardness and stiffness similar to HfC. Interestingly, the composite exhibits Much higher strength and fracture toughness than HfC due to its fine and anisotropic grains. Diffusion-accommodated grain-boundary sliding of Hf-Al-C ceramics at high temperature is inhibited by glass-free grain boundaries and tight interlocking of grains at grain-edge triple junctions, resulting in high remaining stiffness up to 1600 degrees C. Dislocations on the basal planes of Hf-Al-C ceramics with a Burgers vector of 1/3 < 11 (2) over bar0 > can be activated at high temperature. Hf-Al-C composite shows higher coefficient of thermal expansion and specific heat capacity as well as lower thermal conductivity than HfC. The superior mechanical and thermal properties make Hf-Al-C compounds good high-temperature structural materials. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
部门归属	[he, l. f.; bao, y. w.; wang, j. y.; li, m. s.; zhou, y. c.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [he, l. f.] chinese acad sci, grad sch, beijing 100049, peoples r china.;zhou, yc (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china;yczhou@imr.ac.cn
关键词	Carbides Tem High Temperature Mechanical Property Thermal Property High-temperature Elastic Properties Crystal-structure Thermoelectric Properties Internal-friction Silicon Carbides Grain-boundary Bulk Zr2al3c4 Ceramics Oxidation
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WOS记录号	WOS:000266180300019
引用统计	被引频次：36[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/31959
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	L. F. He,Y. W. Bao,J. Y. Wang,et al. Microstructure and mechanical and thermal properties of ternary carbides in Hf-Al-C system[J]. Acta Materialia,2009,57(9):2765-2774.
APA	L. F. He,Y. W. Bao,J. Y. Wang,M. S. Li,&Y. C. Zhou.(2009).Microstructure and mechanical and thermal properties of ternary carbides in Hf-Al-C system.Acta Materialia,57(9),2765-2774.
MLA	L. F. He,et al."Microstructure and mechanical and thermal properties of ternary carbides in Hf-Al-C system".Acta Materialia 57.9(2009):2765-2774.