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Understanding ductile-to-brittle transition of metallic glasses from shear transformation zone dilatation
Jiang MQ(蒋敏强); Wilde G; Jiang F; Dai LH(戴兰宏)
Source PublicationTheoretical and Applied Mechanics Letters
2015
Volume5Issue:5Pages:200-204
ISSN2095-0349
Abstract

A theoretical model that takes into account the free-volume aided cooperative shearing of shear transformation zones (STZs) is developed to quantitatively understand the ductile-to-brittle transition(DBT) of metallic glasses. The STZ dilatational strain is defined as the ratio of STZ-activated free volume to STZ volume itself. The model demonstrates that the STZ dilatational strain will increase drastically and exceed the characteristic shear strain of STZ as temperature decreases below a critical value. This critical temperature is in good agreement with the experimentally measured DBT temperature. Our results suggest that the DBT of metallic glasses is underpinned by the transition of atomic-cluster motions from STZ-type rearrangements to dilatational processes (termed tension transformation zones (TTZs)).

KeywordDuctile-to-brittle Transition Metallic Glass Fracture Shear Transformation Zone Tension Transformation Zone
Indexed ByCSCD
Language英语
Funding Organizationsupported by the National Nature Science Foundation of China ; the National Basic Research Program of China ; the CAS/SAFEA International Partnership Program for Creative Research Teams ; partially also by DFG
CSCD IDCSCD:5565646
DepartmentLNM冲击动力学与新型材料力学性能
Classification二类
Ranking1
Citation statistics
Cited Times:1[CSCD]   [CSCD Record]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/60782
Collection非线性力学国家重点实验室
Recommended Citation
GB/T 7714
Jiang MQ,Wilde G,Jiang F,et al. Understanding ductile-to-brittle transition of metallic glasses from shear transformation zone dilatation[J]. Theoretical and Applied Mechanics Letters,2015,5(5):200-204.
APA Jiang MQ,Wilde G,Jiang F,&Dai LH.(2015).Understanding ductile-to-brittle transition of metallic glasses from shear transformation zone dilatation.Theoretical and Applied Mechanics Letters,5(5),200-204.
MLA Jiang MQ,et al."Understanding ductile-to-brittle transition of metallic glasses from shear transformation zone dilatation".Theoretical and Applied Mechanics Letters 5.5(2015):200-204.
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