Cast defects induced sample-size dependency on compressive strength and fracture toughness of Mg-Cu-Ag-Gd bulk metallic glass

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	Cast defects induced sample-size dependency on compressive strength and fracture toughness of Mg-Cu-Ag-Gd bulk metallic glass
	S. G. Wang; M. Y. Sun; Z. Q. Song; J. Xu
	2012
发表期刊	Intermetallics
ISSN	0966-9795
卷号	29 页码:123-132
摘要	In this work, Mg59.5Cu22.9Ag6.6Gd11 bulk metallic glass (BMG) is selected to investigate the specimen-size dependency of the compressive fracture strength and notch toughness. As the diameter of cylindrical sample increases, apparent fracture strength is reduced by 25% from similar to 950 MPa at 1-mm down to similar to 710 MPa at 10-mm sample, which is associated with the population and size of as-cast porosity in the BMG rods as indicated by X-ray computed tomography (CT). Meanwhile, it is inappropriate to describe the size dependence of fracture strength using Weibull or Gumbel statistics owing to the inhomogeneous distribution of cast defects in different sized rods. Similar to the compressive fracture strength, cast defects in Mg59.5Cu22.9Ag6.6Gd11 BMG also yield specimen-size dependency of the measured notch toughness, when the plate-specimen thickness varies within the range of 1-8 mm. With three-parameter Weibull analysis, threshold toughness K-mu of as-cast Mg59.5Cu22.9Ag6.6Gd11 BMG can be estimated, which represents a minimum toughness value below which the cracks arrest. Using finite element analysis, it is confirmed that the specimen-thickness dependency of notch toughness does not result from the transition from plane-stress to plane-strain in the specimen, but from the extrinsic flaws. (C) 2012 Elsevier Ltd. All rights reserved.
部门归属	[wang, shao-gang; sun, ming-yue; song, zhen-qiang; xu, jian] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china.;xu, j (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, peoples r china.;jianxu@imr.ac.cn
关键词	Glasses Metallic Fracture Toughness Fracture Stress Brittleness And Ductility Tomography Stress States Porosity Alloy Behavior Steel Distributions Failure Solids
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/60304
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	S. G. Wang,M. Y. Sun,Z. Q. Song,et al. Cast defects induced sample-size dependency on compressive strength and fracture toughness of Mg-Cu-Ag-Gd bulk metallic glass[J]. Intermetallics,2012,29:123-132.
APA	S. G. Wang,M. Y. Sun,Z. Q. Song,&J. Xu.(2012).Cast defects induced sample-size dependency on compressive strength and fracture toughness of Mg-Cu-Ag-Gd bulk metallic glass.Intermetallics,29,123-132.
MLA	S. G. Wang,et al."Cast defects induced sample-size dependency on compressive strength and fracture toughness of Mg-Cu-Ag-Gd bulk metallic glass".Intermetallics 29(2012):123-132.