疲劳态铜单晶高速形变下绝热剪切带的形成  

FORMATION OF ADIABATIC SHEAR BANDS IN THE FATIGUED COPPER SINGLE CRYSTAL DEFORMED AT HIGH STRAIN RATE

作　　者：李军伟[1] 李明扬[2] 郭小龙[1] 李守新[1] 

机构地区：[1]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 [2]东北大学理学院,沈阳110004

出　　处：《金属学报》2005年第2期161-166,共6页Acta Metallurgica Sinica

基　　金：国家自然科学基金资助项目50271075

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.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.

关 键 词：绝热剪切带 HOPKINSON压杆 单晶铜 驻留滑移带 

分 类 号：TG146.11[一般工业技术—材料科学与工程] TG111.7[金属学及工艺—金属材料]