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Materials 2017, 10(1), 73; doi:10.3390/ma10010073

Properties of a Laser Shock Wave in Al-Cu Alloy under Elevated Temperatures: A Molecular Dynamics Simulation Study

1
School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China
2
School of Mechanical & Vehicle Engineering, Changzhou Institute of Technology, Changzhou 213022, China
*
Author to whom correspondence should be addressed.
Academic Editor: Mark T. Whittaker
Received: 2 October 2016 / Revised: 2 December 2016 / Accepted: 3 January 2017 / Published: 18 January 2017
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Abstract

The laser shock wave (LSW) generated by the interaction between a laser and a material has been widely used in laser manufacturing, such as laser shock peening and laser shock forming. However, due to the high strain rate, the propagation of LSW in materials, especially LSW at elevated temperatures, is difficult to study through experimental methods. A molecular dynamics simulation was used in this study to investigate the propagation of LSW in an Al-Cu alloy. The Hugoniot relations of LSW were obtained at different temperatures and the effects of elevated temperatures on shock velocity and shock pressure were analyzed. Then the elastic and plastic wave of the LSW was researched. Finally, the evolution of dislocations induced by LSW and its mechanism under elevated temperatures was explored. The results indicate that the shock velocity and shock pressure induced by LSW both decrease with the increasing temperatures. Moreover, the velocity of elastic wave and plastic wave both decrease with the increasing treatment temperature, while their difference decreases as the temperature increases. Moreover, the dislocation atoms increases with the increasing temperatures before 2 ps, while it decreases with the increasing temperatures after 2 ps. The reason for the results is related to the formation and evolution of extended dislocations. View Full-Text
Keywords: laser shock wave; molecular dynamics simulation; elevated temperature; Al-Cu alloy; dislocations laser shock wave; molecular dynamics simulation; elevated temperature; Al-Cu alloy; dislocations
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Meng, X.; Zhou, J.; Huang, S.; Su, C.; Sheng, J. Properties of a Laser Shock Wave in Al-Cu Alloy under Elevated Temperatures: A Molecular Dynamics Simulation Study. Materials 2017, 10, 73.

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