Laser Short-Pulse Heating of Gold-Copper Two-Layer Assembly : Thermo-Elasto-Plastic Analysis
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概要
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Laser short-pulse heating of metallic substrates results in nonequilibrium heating in the surface region of the substrate material. In this case, electron temperature rises at faster rate than lattice site temperature. Moreover, when modelling the heating process, thermomechanical coupling should be accommodated in the energy transport equation to account for the thermomechanical response of the substrate material. In the present study, laser short-pulse heating of gold, copper, and gold-copper assembly is considered. The energy transport inside the substrate material is modelled using an electron kinetic theory approach. Thermomechanical coupling is included in the analysis when modeling the nonequilibrium heating process. Since stress levels exceed the plastic limit of the substrate material, elasto-plastic analysis is employed in the analysis. It is found that 0.5 μm gold layer does not result in temperature gradient change across the gold-copper interface. The plastic region is formed in the surface region of the substrate material, which extends up to almost 2 x 10^<-8> m below the surface.
- 社団法人応用物理学会の論文
- 2002-08-15