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Understanding ductile-to-brittle transition of metallic glasses from shear transformation zone dilatation

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Jiang M Q 1 *   Wilde G 2   Jiang F 3   Dai L H 1 *  
文摘 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)).
来源 Theoretical and Applied Mechanics Letters ,2015,5(5):200-204 【核心库】
DOI 10.1016/j.taml.2015.09.002
关键词 Ductile-to-brittle transition ; Metallic glass ; Fracture ; Shear transformation zone ; Tension transformation zone
地址

1. Institute of Mechanics, Chinese Academy of Sciences, State Key Laboratory of Nonlinear Mechanics, Beijing, 100190  

2. Institute of Materials Physics, Westfalische Wilhelms-Universitat Munster, Germany, Munster, 48149  

3. Xi’an Jiaotong University, State Key Laboratory for Mechanical Behavior of Materials, Xi’an, 710049

语种 英文
文献类型 研究性论文
ISSN 2095-0349
学科 力学
基金 国家自然科学基金 ;  国家973计划 ;  中国科学院创新团队国际合作伙伴计划 ;  partially also by DFG
文献收藏号 CSCD:5565646

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