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) | |
发表期刊 | Theoretical and Applied Mechanics Letters |
2015 | |
卷号 | 5期号:5页码:200-204 |
ISSN | 2095-0349 |
摘要 | 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)). |
关键词 | Ductile-to-brittle Transition Metallic Glass Fracture Shear Transformation Zone Tension Transformation Zone |
收录类别 | CSCD |
语种 | 英语 |
项目资助者 | supported 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记录号 | CSCD:5565646 |
课题组名称 | LNM冲击动力学与新型材料力学性能 |
论文分区 | 二类 |
力学所作者排名 | 1 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://dspace.imech.ac.cn/handle/311007/60782 |
专题 | 非线性力学国家重点实验室 |
推荐引用方式 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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