MOLECULAR DYNAMICS INVESTIGATION OF PHASE CHANGE INDUCED BY ULTRAFAST LASER IRRADIATION

Ji, Pengfei1; Rong, Yiming1; Zhang, Yuwen2; Tang, Yong3

10.1115/IMECE2017-70143

2018

PROCEEDINGS OF THE ASME INTERNATIONAL MECHANICAL ENGINEERING CONGRESS AND EXPOSITION, 2017 VOL 8

8

Tampa, FL, United states

THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA

AMER SOC MECHANICAL ENGINEERS

Irradiated by ultrafast laser pulse, the phase change phenomena in aluminum film are investigated via molecular dynamics simulation. The embedded-atom method potential is employed to describe atomic interactions. The laser heating is modeled by adding a kinetic energy term to the laser pulse irradiated atom at each time step. The resolidification is realized by thermal conduction to cool down locally melted atoms. The temporal and spatial distribution of atomic motion is recorded to compute the temperature evolution and structure change during melting and resolidification processes. The interface between solid and liquid is identified via Ackland analysis. Due to the temperature difference, diffraction profile of the resolidified aluminum is found different from the aluminum before laser irradiation. The simulation results provide helpful information on the atomic scale temperature variation and structure transformation underlying ultrafast laser induced phase change.

第一 ; 通讯

英语

CPCI-S ; EI

Postdoctoral Science Foundation of China[2017M612653]

Thermodynamics ; Engineering

Thermodynamics ; Engineering, Mechanical

WOS:000428485700066

20180504684343

Atoms ; Heat transfer ; Irradiation ; Kinetic energy ; Kinetics ; Laser pulses ; Molecular dynamics ; Phase interfaces ; Thermal Engineering ; Ultrafast lasers

Heat Transfer:641.2 ; Lasers, General:744.1 ; Physical Chemistry:801.4 ; Classical Physics; Quantum Theory; Relativity:931 ; Atomic and Molecular Physics:931.3

Web of Science

1.Southern Univ Sci & Technol, Dept Mech & Energy Engn, Shenzhen 518055, Peoples R China
2.Univ Missouri, Dept Mech & Aerosp Engn, Columbia, MO 65211 USA
3.South China Univ Technol, Sch Mech & Automot Engn, Guang Dong Higher Educ Inst, Key Lab Surface Funct Struct Mfg, Guangzhou 510640, Guangdong, Peoples R China

Ji, Pengfei,Rong, Yiming,Zhang, Yuwen,et al. MOLECULAR DYNAMICS INVESTIGATION OF PHASE CHANGE INDUCED BY ULTRAFAST LASER IRRADIATION[C]. THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA:AMER SOC MECHANICAL ENGINEERS,2018.