| 疲劳态铜单晶高速形变下绝热剪切带的形成 |
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| 引用本文： | 李军伟,李明扬,郭小龙,李守新.疲劳态铜单晶高速形变下绝热剪切带的形成[J].金属学报,2005,41(2):161-166. |
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| 作者姓名： | 李军伟 李明扬 郭小龙 李守新 |
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| 作者单位： | 中国科学院金属研究所沈阳材料科学国家(联合)实验室,沈阳,110016;东北大学理学院,沈阳,110004 |
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| 基金项目： | 国家自然科学基金资助项目50271075 |
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| 摘 要： | 采用分离式Hopkinson压杆(SHPB)实验装置和SEM研究了原始态和疲劳态铜单晶在高应变率下形变的组织演变．实验结果表明：原始态铜单晶在高应变率下很难产生绝热剪切带(ASB)，而疲劳态铜单晶容易产生绝热剪切带．驻留滑移带(PSBs)和冲击波引起的应力集中是疲劳态铜单晶高应变率形变下绝热剪切带形成的重要原因，绝热剪切带的间距和宽度随应变率的增大而减小．
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| 关 键 词： | 绝热剪切带 Hopkinson压杆 单晶铜 驻留滑移带 |
| 文章编号： | 0412-1961(2005)02-0161-06 |
FORMATION OF ADIABATIC SHEAR BANDS IN THE FATIGUED COPPER SINGLE CRYSTAL DEFORMED AT HIGH STRAIN RATE |
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| LI Junwei,LI Mingyang,GUO Xiaolong,LI Shouxin.FORMATION OF ADIABATIC SHEAR BANDS IN THE FATIGUED COPPER SINGLE CRYSTAL DEFORMED AT HIGH STRAIN RATE[J].Acta Metallurgica Sinica,2005,41(2):161-166. |
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| Authors: | LI Junwei LI Mingyang GUO Xiaolong LI Shouxin |
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| Affiliation: | LI Junwei,LI Mingyang,GUO Xiaolong,LI ShouxinShenyang National Laboratory for Materials Science,Institute of Metal Research,The Chinese Academy of Sciences,Shenyang 110016School of Science,Northeastern University,Shenyang 110004 |
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| Abstract: | The microstructures of the primary and fatigued copper single crystals deformed at high strain rate were studied by Split-Hopkinson pressure bar (SHPB) and SEM. The results indicate that it is difficult to form the adiabatic shear bands (SBs) for the primary copper single crystal but it is easy for fatigued copper single crystal deformed at high strain rate. Persistent slip bands (PSBs) and stress concentration induced by shock wave are the main reasons to form the adiabatic SBs. The spacing and width of the adiabatic SBs decrease with increasing strain rates. |
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| Keywords: | adiabatic shear band Split-Hopkinson pressure bar (SHPB) copper single crystal persistent slip band (PSB) |
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