| 细晶93W-4.9Ni-2.1Fe合金动态压缩下绝热剪切带的形成及其特征 |
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| 引用本文： | 龚 星,范景莲,刘 涛,田家敏,黄伯云,李树奎.细晶93W-4.9Ni-2.1Fe合金动态压缩下绝热剪切带的形成及其特征[J].稀有金属材料与工程,2010,39(8):1390-1394. |
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| 作者姓名： | 龚 星 范景莲 刘 涛 田家敏 黄伯云 李树奎 |
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| 作者单位： | 1. 中南大学,粉末冶金国家重点实验室,湖南,长沙,410083
2. 北京理工大学,北京,100081 |
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| 基金项目： | 国家自然科学基金，国家自然科学基金创新群体项目 |
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| 摘 要： | 利用分离式Hopkinson动态压缩装置对添加0.03%Y2O3(质量分数, 下同)的细晶93W-4.9Ni-2.1Fe合金试样进行动态力学性能测试，观察分析了动态压缩后合金试样的显微组织。结果表明：在应变速率为1900 s-1下，合金沿着与冲击方向成45o的方向形成了明显的绝热剪切带，宽度10~25 μm。说明该合金对局部绝热剪切的敏感性大大提高且能在相对较低的应变速率下发生绝热剪切。同时位于剪切带中心区域的钨颗粒沿着其扩展方向被剧烈拉长成纤维状，表现出塑性流动局域失稳的特征
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| 关 键 词： | 细晶钨合金 动态加载 绝热剪切带 |
| 收稿时间： | 2009/8/23 0:00:00 |
Formation and Characteristics of Adiabatic Shear Band in Fine-Grained 93W-4.9Ni-2.1Fe Alloy under Dynamic Compression |
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| Gong Xing,Fan Jinglian,Liu Tao,Tian Jiamin,Huang Boyun and Li Shukui.Formation and Characteristics of Adiabatic Shear Band in Fine-Grained 93W-4.9Ni-2.1Fe Alloy under Dynamic Compression[J].Rare Metal Materials and Engineering,2010,39(8):1390-1394. |
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| Authors: | Gong Xing Fan Jinglian Liu Tao Tian Jiamin Huang Boyun and Li Shukui |
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| Affiliation: | State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China;State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410084, China;State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410085, China;State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410086, China;State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410087, China;Beijing Institute of Technology, Beijing 100081, China |
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| Abstract: | he dynamic mechanical properties of fine-grained tungsten heavy alloy 93W-4.9Ni-2.1Fe with trace yttria addition were investigated under dynamic compression using Split Hopkinson Pressure Bar. The microstructure of the alloy sample after dynamic compression was analyzed. The results reveal that two obvious adiabatic shear bands were observed at the strain rate of 1900 s-1, indicating that the susceptibility of the fine-grained alloy to local adiabatic shear is significantly enhanced and the fine-grained alloy can form the shear bands at a lower strain rate. The adiabatic shear bands initiate in the crack tip region of the surface area of the specimen, propagating deeply along orientations at 45o to the impact direction. The bands have much narrower width of about 10-25 mm than that of traditional tungsten heavy alloy. Within the center of the bands, the tungsten grains are severely elongated to be fibrous along the propagation directions of the adiabatic shear bands, exhibiting plastic flow localized instability |
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| Keywords: | fine-grained tungsten heavy alloy dynamic loading adiabatic shear bands |
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