| Work toughening effect in Zr_（41）Ti_（14）Cu_（12.5）Ni_（10）Be_（22.5） bulk metallic glass |
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| 引用本文： | QIU ShengBao,GONG Pan,YAO KeFu. Work toughening effect in Zr_（41）Ti_（14）Cu_（12.5）Ni_（10）Be_（22.5） bulk metallic glass[J]. 科学通报(英文版), 2011, 56(36): 3942-3947. DOI: 10.1007/s11434-011-4782-7 |
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| 作者姓名： | QIU ShengBao GONG Pan YAO KeFu |
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| 作者单位： | Key Laboratory for Advanced Materials Processing Technology, Department of Mechanical Engineering, Tsinghua University,Beijing 100084, China |
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| 基金项目： | supported by the National Basic Research Program of China (2007CB613905); the National Natural Science Foundation of China (50671050 and 50971073); the National Center for Nanoscience and Technology of China |
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| 摘 要： | Work hardening is a well-known phenomenon occurring in crystalline metals during deformation,which has been widely used to increase the strength of metals although their ductility is usually reduced simultaneously. Here we report that the plastic strain of Zr41Ti14Cu12.5Ni10Be22.5 (at.%) bulk metallic glasses has been increased from 0.3% for the as-cast sample to 2.5%-8.0% for samples that have experienced pre-deformation under constrained conditions. The pre-deformed glassy alloys possess more free volume and abundant introduced shear bands,which are believed to promote the activation of shear bands in post-deformation and result in an increase in plasticity. The orientation of the pre-introduced shear bands relative to the loading direction will affect the deformation behavior of pre-deformed samples. The present results show that pre-deformation of this glassy alloy will result in work toughening. This work toughening effect can be removed by isothermal annealing at a sub-Tg (glass transition) temperature,which causes annihilation of free volume and healing of shear bands.
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| 关 键 词： | metallic glass mechanical properties shear bands |
| 收稿时间： | 2009-12-16 |
Work toughening effect in Zr41Ti14Cu12.5Ni10Be22.5 bulk metallic glass |
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| ShengBao Qiu,Pan Gong,KeFu Yao. Work toughening effect in Zr41Ti14Cu12.5Ni10Be22.5 bulk metallic glass[J]. Chinese science bulletin, 2011, 56(36): 3942-3947. DOI: 10.1007/s11434-011-4782-7 |
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| Authors: | ShengBao Qiu Pan Gong KeFu Yao |
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| Affiliation: | QIU ShengBao,GONG Pan & YAO KeFu Key Laboratory for Advanced Materials Processing Technology,Department of Mechanical Engineering,Tsinghua University,Beijing 100084,China |
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| Abstract: | Work hardening is a well-known phenomenon occurring in crystalline metals during deformation, which has been widely used to increase the strength of metals although their ductility is usually reduced simultaneously. Here we report that the plastic strain of Zr41Ti14Cu12.5Ni10Be22.5 (at.%) bulk metallic glasses has been increased from 0.3% for the as-cast sample to 2.5%–8.0% for samples that have experienced pre-deformation under constrained conditions. The pre-deformed glassy alloys possess more free volume and abundant introduced shear bands, which are believed to promote the activation of shear bands in post-deformation and result in an increase in plasticity. The orientation of the pre-introduced shear bands relative to the loading direction will affect the deformation behavior of pre-deformed samples. The present results show that pre-deformation of this glassy alloy will result in work toughening. This work toughening effect can be removed by isothermal annealing at a sub-T g (glass transition) temperature, which causes annihilation of free volume and healing of shear bands. |
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| Keywords: | metallic glass mechanical properties shear bands |
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