Cast defects induced sample-size dependency on compressive strength and fracture toughness of Mg-Cu-Ag-Gd bulk metallic glass
文献类型：期刊论文
| 作者 | S. G. Wang ; M. Y. Sun ; Z. Q. Song ; J. Xu |
| 刊名 | Intermetallics
 |
| 出版日期 | 2012 |
| 卷号 | 29页码:123-132 |
| 关键词 | Glasses metallic Fracture toughness Fracture stress Brittleness and ductility Tomography stress states porosity alloy behavior steel distributions failure solids |
| ISSN号 | 0966-9795 |
| 中文摘要 | 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. |
| 原文出处 | |
| 公开日期 | 2013-02-05 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/60304]  |
| 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 | 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. |
入库方式： OAI收割
来源：金属研究所
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