Solid–liquid interface velocity and diffusivity in laser-melt amorphous silicon

2000 ◽  
Vol 77 (15) ◽  
pp. 2337-2339 ◽  
Author(s):  
Luigi Brambilla ◽  
Luciano Colombo ◽  
Vittorio Rosato ◽  
Fabrizio Cleri
Keyword(s):  
Amorphous Silicon ◽  
Interface Velocity ◽  
Liquid Interface ◽  
Solid Liquid Interface ◽  
Solid Liquid

scholarly journals Erratum: “Solid–liquid interface velocity and diffusivity in laser-melt amorphous silicon” [Appl. Phys. Lett. 77, 2337 (2000)]

2001 ◽  
Vol 78 (19) ◽  
pp. 2988-2988
Author(s):  
Luigi Brambilla ◽  
Luciano Colombo ◽  
Vittorio Rosato ◽  
Fabrizio Cleri
Keyword(s):  
Amorphous Silicon ◽  
Interface Velocity ◽  
Liquid Interface ◽  
Solid Liquid Interface ◽  
Solid Liquid

Solidification and Epitaxial Re-Growth in Surface Nanostructuring With Laser-Assisted Scanning Tunneling Microscope

2005 ◽  
Author(s):  
Xinwei Wang ◽  
Yongfeng Lu
Keyword(s):  
Thermal Strain ◽  
Interface Velocity ◽  
Liquid Interface ◽  
Dynamics Simulation ◽  
Scanning Tunneling ◽  
Shear Stresses ◽  
Surface Nanostructuring ◽  
Long Time ◽  
Solid Liquid Interface ◽  
Solid Liquid

In this work, parallel molecular dynamics simulation is conducted to study the long-time (up to 2 ns) behavior of argon crystal in surface-nanostructuring with laser-assisted STM. A large system consisting of more than one hundred million atoms is explored. The study is focused on the solidification procedure after laser irradiation, which is driven by heat conduction in the material. Epitaxial re-growth is observed in the solidification. Atomic dislocation due to thermal strain-induced structural damages is observed as well in the epitaxial re-growth. During solidification, the liquid is featured with decaying normal compressive stresses and negligible shear stresses. Two functions are designed to capture the structure and distinguish the solid and liquid regions. These functions work well in terms of reflecting the crystallinity of the material and identifying the atomic dislocations. The study of the movement of the solid-liquid interface reveals an accelerating velocity in the order of 3~5 m/s. The spatial distribution of the solid-liquid interface velocity indicates a non-uniform epitaxial re-growth in space. The bottom of the liquid solidifies slower than that at the edge.

Processing/Microstructure Relationships in Surface Melting

1982 ◽  
Vol 13 ◽  
Author(s):  
R. J. Schaefer ◽  
R. Mehrabian
Keyword(s):  
Rapid Solidification ◽  
Interface Velocity ◽  
Surface Melting ◽  
Liquid Interface ◽  
Flow Models ◽  
Prediction And Control ◽  
Beam Surface ◽  
Solid Liquid Interface ◽  
Solid Liquid ◽  
And Control

ABSTRACTThe development of predictive models for rapid surface melting and resolidification requires coupling of realistic heat flow models to emerging theories of rapid solidification processing. Attainment of unique microstructures and phases,for example through plane-front solidification and solute trapping, can be correlated to solid/liquid interface velocity,temperature and temperature gradients, and to theories of morphological stability. However, there are important limitations on achievable solid/liquid interface velocity depending upon the heating mode and heat flux distribution,melt thickness and location of the interface within the molten zone.An overview is given of the emerging guidelines for prediction and control of rapid solidification conditions and microstructures. Homogenization of the liquid by convection and diffusion is also discussed. Electron beam surface melting of alloy substrates is used as an example of these processes.

Modeling of Nonequilibrium Surface Melting and Resolidification for Pure Metals and Binary Alloys

1996 ◽  
Vol 118 (4) ◽  
pp. 944-951 ◽  
Author(s):  
G.-X. Wang ◽  
E. F. Matthys
Keyword(s):  
Interface Velocity ◽  
Surface Melting ◽  
Liquid Interface ◽  
Solute Diffusion ◽  
High Heat Flux ◽  
Slow Kinetics ◽  
Pure Metals ◽  
Velocity Variations ◽  
Solid Liquid Interface ◽  
Solid Liquid

A model was developed for surface melting and resolidification of both pure metal and binary alloy substrates. Nonequilibrium kinetics are introduced in the model to account for the departure from thermodynamic equilibrium at the solid/liquid interface. The modeled problem involves a moving boundary with both heat and solute diffusion and is solved by an implicit control volume integral method with solid/liquid interface immobilization by coordinate transformation. To illustrate the model capabilities, we have analyzed laser-induced surface melting of pure metals (Al, Cu, Ni, Ti) and dilute Al–Cu alloys, and some typical results are presented. The computation results show some large solid overheating and melt undercooling effects, which result from the high heat flux and the slow kinetics. Large interface velocity variations are also seen during the process, depending on the substrate material and laser flux. Complex interface velocity variations during the earlier stages of resolidification were also predicted for the alloys, and result from interactions between the several physical mechanisms involved. Results on interface temperatures, solute concentrations, and nonequilibrium partition coefficients are also presented.

Observation of Femtosecond Acoustic Anomaly in a Solid Liquid Interface

2020 ◽  
Vol 124 (5) ◽  
pp. 2987-2993
Author(s):  
Chi-Kuang Sun ◽  
Yi-Ting Yao ◽  
Chih-Chiang Shen ◽  
Mu-Han Ho ◽  
Tien-Chang Lu ◽  
...  
Keyword(s):  
Liquid Interface ◽  
Acoustic Anomaly ◽  
Solid Liquid Interface ◽  
Solid Liquid
Sign in / Sign up

Export Citation Format

Share Document