Extra-electron induced covalent strengthening and generalization of intrinsic ductile-to-brittle criterion

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	Extra-electron induced covalent strengthening and generalization of intrinsic ductile-to-brittle criterion
	H. Y. Niu ; X. Q. Chen ; P. T. Liu ; W. W. Xing ; X. Y. Cheng ; D. Z. Li ; Y. Y. Li
刊名	Scientific Reports
	2012
卷号	2
关键词	metallic-glass supercooled liquid alloys aluminium phases
ISSN号	2045-2322
中文摘要	Traditional strengthening ways, such as strain, precipitation, and solid-solution, come into effect by pinning the motion of dislocation. Here, through first-principles calculations we report on an extra-electron induced covalent strengthening mechanism, which alters chemical bonding upon the introduction of extra-valence electrons in the matrix of parent materials. It is responsible for the brittle and high-strength properties of Al12W-type compounds featured by the typical fivefold icosahedral cages, which are common for quasicrystals and bulk metallic glasses (BMGs). In combination with this mechanism, we generalize ductile-to-brittle criterion in a universal hyperbolic form by integrating the classical Pettifor's Cauchy pressure with Pugh's modulus ratio for a wide variety of materials with cubic lattices. This study provides compelling evidence to correlate Pugh's modulus ratio with hardness of materials and may have implication for understanding the intrinsic brittleness of quasicrystals and BMGs.
原文出处	://WOS:000309583200003
公开日期	2013-02-05
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/60171]
专题	金属研究所_中国科学院金属研究所
推荐引用方式 GB/T 7714	H. Y. Niu,X. Q. Chen,P. T. Liu,et al. Extra-electron induced covalent strengthening and generalization of intrinsic ductile-to-brittle criterion[J]. Scientific Reports,2012,2.
APA	H. Y. Niu.,X. Q. Chen.,P. T. Liu.,W. W. Xing.,X. Y. Cheng.,...&Y. Y. Li.(2012).Extra-electron induced covalent strengthening and generalization of intrinsic ductile-to-brittle criterion.Scientific Reports,2.
MLA	H. Y. Niu,et al."Extra-electron induced covalent strengthening and generalization of intrinsic ductile-to-brittle criterion".Scientific Reports 2(2012).