Modeling hardness of polycrystalline materials and bulk metallic glasses

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	Modeling hardness of polycrystalline materials and bulk metallic glasses
	X. Q. Chen; H. Y. Niu; D. Z. Li; Y. Y. Li
	2011
发表期刊	Intermetallics
ISSN	0966-9795
卷号	19 期号:9 页码:1275-1281
摘要	Though extensively studied, hardness, defined as the resistance of a material to deformation, still remains a challenging issue for a formal theoretical description due to its inherent mechanical complexity. The widely applied Teter's empirical correlation between hardness and shear modulus has been considered to be not always valid for a large variety of materials. The main reason is that shear modulus only responses to elastic deformation whereas the hardness links both elastic and permanent plastic properties. We found that the intrinsic correlation between hardness and elasticity of materials correctly predicts Vickers hardness for a wide variety of crystalline materials as well as bulk metallic glasses (BMGs). Our results suggest that, if a material is intrinsically brittle (such as BMGs that fail in the elastic regime), its Vickers hardness linearly correlates with the shear modulus (H(v) = 0.151G). This correlation also provides a robust theoretical evidence on the famous empirical correlation observed by Teter in 1998. On the other hand, our results demonstrate that the hardness of polycrystalline materials can be correlated with the product of the squared Pugh's modulus ratio and the shear modulus (H(v) = 2(k(2)G)(0.585) - 3 where k =G/B is Pugh's modulus ratio). Our work combines those aspects that were previously argued strongly, and, most importantly, is capable to correctly predict the hardness of all hard compounds known included in several pervious models. (C) 2011 Elsevier Ltd. All rights reserved.
部门归属	[chen, xing-qiu; niu, haiyang; li, dianzhong; li, yiyi] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, liaoning, peoples r china.;chen, xq (reprint author), chinese acad sci, shenyang natl lab mat sci, inst met res, wenhua rd 72, shenyang 110016, liaoning, peoples r china;xingqiu.chen@imr.ac.cn dzli@imr.ac.cn
关键词	Mechanical Properties Theory Elastic Properties Superhard Rhenium Diboride Elastic-constants High-pressure Mechanical-properties Theoretical Hardness Ambient-pressure Boron Suboxide Nitrides Prediction Carbides
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WOS记录号	WOS:000292714600001
引用统计	被引频次：1846[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/321006/30267
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. Q. Chen,H. Y. Niu,D. Z. Li,et al. Modeling hardness of polycrystalline materials and bulk metallic glasses[J]. Intermetallics,2011,19(9):1275-1281.
APA	X. Q. Chen,H. Y. Niu,D. Z. Li,&Y. Y. Li.(2011).Modeling hardness of polycrystalline materials and bulk metallic glasses.Intermetallics,19(9),1275-1281.
MLA	X. Q. Chen,et al."Modeling hardness of polycrystalline materials and bulk metallic glasses".Intermetallics 19.9(2011):1275-1281.

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