Ductile fracture in notched bulk metallic glasses

IMR OpenIR

	Ductile fracture in notched bulk metallic glasses
	Pan, J.; Wang, Y. X.; Li, Y.; Li, Y (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
	2017-09-01
发表期刊	PERGAMON-ELSEVIER SCIENCE LTD
ISSN	1359-6454
卷号	136 页码:126-133
摘要	The deformation of bulk metallic glasses (BMGs) is generally driven by highly localized shear. Due to such inhomogeneous flow, failure occurs in a catastrophic brittle manner through rapid shear banding, often associated with very limited plastic strain macroscopically. Here, we demonstrate metal-like ductile fracture in Zr-based BMGs under tension, a completely opposite situation, by suppressing shear banding. In the absence of shear bands, nucleation of cavies/voids and subsequent void growth and coalescence dominate the initial plastic failure process, enabling BMGs to display the essential characteristics of ductile fracture, with deep dimples and cup-and-cone morphology. This ductile fracture only occurs in amorphous alloys, but not in the fully crystallized counterpart. Furthermore, the characteristic decohesion strength of the ductile fracture in Zr-based BMGs was found to be 1.75 GPa, one of the highest among engineering metals and alloys. These present findings reveal the previously hidden ductile behavior of BMGs, suggesting an alternative method to enhance the ductility of BMGs by removing shear banding. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.; The deformation of bulk metallic glasses (BMGs) is generally driven by highly localized shear. Due to such inhomogeneous flow, failure occurs in a catastrophic brittle manner through rapid shear banding, often associated with very limited plastic strain macroscopically. Here, we demonstrate metal-like ductile fracture in Zr-based BMGs under tension, a completely opposite situation, by suppressing shear banding. In the absence of shear bands, nucleation of cavies/voids and subsequent void growth and coalescence dominate the initial plastic failure process, enabling BMGs to display the essential characteristics of ductile fracture, with deep dimples and cup-and-cone morphology. This ductile fracture only occurs in amorphous alloys, but not in the fully crystallized counterpart. Furthermore, the characteristic decohesion strength of the ductile fracture in Zr-based BMGs was found to be 1.75 GPa, one of the highest among engineering metals and alloys. These present findings reveal the previously hidden ductile behavior of BMGs, suggesting an alternative method to enhance the ductility of BMGs by removing shear banding. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
部门归属	[pan, j. ; wang, y. x. ; li, y.] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, liaoning, peoples r china
关键词	Bulk Metallic Glasses Triaxial Stress State Ductile Fracture Cavitation Decohesion Stress
学科领域	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
资助者	National Natural Science Foundation of China [51401220, 51471165]
收录类别	SCI
语种	英语
WOS记录号	WOS:000407665300012
引用统计	被引频次：66[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/321006/79130
专题	中国科学院金属研究所
通讯作者	Li, Y (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
推荐引用方式 GB/T 7714	Pan, J.,Wang, Y. X.,Li, Y.,et al. Ductile fracture in notched bulk metallic glasses[J]. PERGAMON-ELSEVIER SCIENCE LTD,2017,136:126-133.
APA	Pan, J.,Wang, Y. X.,Li, Y.,&Li, Y .(2017).Ductile fracture in notched bulk metallic glasses.PERGAMON-ELSEVIER SCIENCE LTD,136,126-133.
MLA	Pan, J.,et al."Ductile fracture in notched bulk metallic glasses".PERGAMON-ELSEVIER SCIENCE LTD 136(2017):126-133.