| Zr基非晶合金准静态压缩下的多重剪切带行为 |
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| 引用本文： | 刘娜,才鸿年,王鲁,邵长星,张海峰,王富耻,兰山. Zr基非晶合金准静态压缩下的多重剪切带行为[J]. 北京理工大学学报, 2006, 26(10): 916-920 |
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| 作者姓名： | 刘娜 才鸿年 王鲁 邵长星 张海峰 王富耻 兰山 |
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| 作者单位： | 北京理工大学,材料科学与工程学院,北京,100081;中国科学院,金属研究所,辽宁,沈阳,110015 |
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| 摘 要： | 利用IUTM和SEM研究了Zr-Ti-Ni-Cu块状非晶合金的准静态单轴压缩变形和断裂行为. 研究表明:该合金的室温压缩变形过程主要表现为弹性和塑性变形,塑性变形阶段没有加工硬化现象. 在准静态压缩条件下Zr基非晶合金表现出多重剪切效应,提高了塑性. 微观研究证明,剪切带的滑移分枝与相互交叉是非晶合金塑性提高的主要机制. 沿着剪切带发现了微空洞和微裂纹,剪切带的形成与自由体积的合并有关. 塑性变形过程中形成脉纹状断口形貌,受力状态的不同脉状花纹表现为不同的形式.
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| 关 键 词： | 非晶合金 压缩性能 塑性 剪切带 |
| 文章编号： | 1001-0645(2006)10-0916-05 |
| 收稿时间： | 2006-04-27 |
| 修稿时间： | 2006-04-27 |
Behavior of Multiple Shear Bands in Zr-Based Bulk Metallic Glass Under Quasi-Static Compressive Loading |
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| LIU N,CAI Hong-nian,WANG Lu,SHAO Chang-xing,ZHANG Hai-feng,WANG Fu-chi and LAN Shan. Behavior of Multiple Shear Bands in Zr-Based Bulk Metallic Glass Under Quasi-Static Compressive Loading[J]. Journal of Beijing Institute of Technology(Natural Science Edition), 2006, 26(10): 916-920 |
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| Authors: | LIU N CAI Hong-nian WANG Lu SHAO Chang-xing ZHANG Hai-feng WANG Fu-chi LAN Shan |
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| Affiliation: | 1. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China; 2. Institute of Metal Research, The Chinese Academy of Science, Shenyang, Liaoning 110015, China |
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| Abstract: | The deformation and fracture behavior under quasi-static compressive loading of a bulk metallic glass,Zr-Ti-Ni-Cu,was studied using instron universal-testing machine(IUTM) and scanning electron microscopy(SEM) at room temperature.The results showed that,the samples experience elastic and plastic deformation process before fracture,no work hardening was found during plastic deformation.Multiple shear bands were observed with more plasticity under lower strain-rate.Slipping,branching and intersecting of multiple shear bands are the main microscopic mechanisms for enhancing the plasticity.Micro-scale voids and cracks exit along the shear bands,voids growth and linkage tend to form cracks.The fracture surface is typical veinlike pattern during plastic deformation,showing different patterns under different stress states. |
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| Keywords: | metallic glass compressive strength ductility shear band |
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