Dynamic response of single crystalline copper subjected to quasi-isentropic, gas-gun driven loading

被引:45
作者
Jarmakani, H. [1 ]
McNaney, J. M.
Kad, B.
Orlikowski, D.
Nguyen, J. H.
Meyers, M. A.
机构
[1] Univ Calif San Diego, Dept Mech & Aerosp Engn, Mat Sci Program, La Jolla, CA 92093 USA
[2] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2007年 / 463卷 / 1-2期
关键词
isentropic compression; twinning transition; microstructural defects; laser shock; gas-gun; copper;
D O I
10.1016/j.msea.2006.09.118
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
A transmission electron microscopy study of quasi-isentropic gas-gun loading (peak pressures between 18 and 52GPa) of [0 0 1] monocrystalline copper was carried out. The defect substructures at these different, pressures were analyzed. Current experimental evidence suggests a deformation substructure that transitions from slip to twinning, where twinning occurs at the higher pressures (similar to 52 GPa), and heavily dislocated laths and dislocation cells take place at the intermediate and lower pressures. Evidence of stacking faults at the intermediate pressures was also found. Dislocation cell sizes decreased with increasing pressure and increased with distance away, from the surface of impact. The results from the quasi-isentropic experiments are compared with those for flyer-plate and laser shock experiments reported in the literature. The Preston-Tonks-Wallace constitutive description is used to model both quasi-isentropic and shock compression experiments and predict the pressure at which the slip-twinning transition occurs in both cases. The model predicts a higher twinning transition pressure for isentropic than for shock experiments, and that twinning should not take place in the quasi-isentropic compression experiments given the loading paths investigated. Published by Elsevier B.V.
引用
收藏
页码:249 / 262
页数:14
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