Relationship between bonding characteristics and mechanical properties of L1(2) intermetallics

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	Relationship between bonding characteristics and mechanical properties of L1(2) intermetallics
	C. G. Meng; J. T. Guo; Z. Q. Hu
	1996
发表期刊	Journal of Alloys and Compounds
ISSN	0925-8388
卷号	237 期号:1-2 页码:139-143
摘要	The bonding characteristics of A(3)B L1(2) intermetallics have been studied by the discrete variational X(alpha) cluster method. Two concepts, i.e. similarity of bonding strength and delocalization of bonding electrons, are introduced to explain the ductility or brittleness of the materials. The analysis of bonding characteristics shows that the strength of the A-A bond is similar to that of the A-B bond in A(3)B L1(2) intermetallics, and the delocalized degree of bonding electrons is different between the ductile and brittle intermetallics. This is a dominant factor in governing the ductile/brittle behavior of the materials. Environmental embrittlement in some intermetallics is related to the reactive centers in grain boundaries, which is due to the directional bonding and a small amount of charge transfer, and the reactive centers weaken the ability against the attack of the environmental species. The effect of stoichiometry on ductility contributes to the degree of delocalized bonding electrons. Mechanical strength of the materials is correlated with the covalent bond strength.
部门归属	acad sinica,inst met res,shenyang 110015,peoples r china.;meng, cg (reprint author), dalian univ technol,sch chem engn,dalian 116012,peoples r china
关键词	Intermetallics Mechanical Properties Bond Strength Calculations Intergranular Hydrogen Embrittlement Grain-boundary Strength Ll2 Ordered Alloys Environmental Embrittlement Fracture Ductility Co3ti
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/38369
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	C. G. Meng,J. T. Guo,Z. Q. Hu. Relationship between bonding characteristics and mechanical properties of L1(2) intermetallics[J]. Journal of Alloys and Compounds,1996,237(1-2):139-143.
APA	C. G. Meng,J. T. Guo,&Z. Q. Hu.(1996).Relationship between bonding characteristics and mechanical properties of L1(2) intermetallics.Journal of Alloys and Compounds,237(1-2),139-143.
MLA	C. G. Meng,et al."Relationship between bonding characteristics and mechanical properties of L1(2) intermetallics".Journal of Alloys and Compounds 237.1-2(1996):139-143.