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Stabilization of Metallic Glasses by Irradiation with Picosecond Laser Pulses.

Published online by Cambridge University Press:  26 February 2011

A. P. Radliński ,
A. Calka  and
B. Luther Davies
A. P. Radliński
Affiliation:
Department of Solid State PhysicsResearch School of Physical SciencesThe Australian National University, GPO Box 4, Canberra, ACT, 2601, Australia.
A. Calka
Affiliation:
Department of Solid State PhysicsResearch School of Physical SciencesThe Australian National University, GPO Box 4, Canberra, ACT, 2601, Australia.
B. Luther Davies
Affiliation:
Department of Engineering Physics, Research School of Physical SciencesThe Australian National University, GPO Box 4, Canberra, ACT, 2601, Australia.
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Introduction

Glassy metallic alloys are usually formed by bringing a small amount of the melt mechanically into good thermal contact with a heat conducting medium. Cooling rates of the order of 106K/sec can thereby be obtained. Despite the extensive use of laser treatment in many areas of technology the idea of using ultra short laser pulses to increase the cooling rate by many orders of magnitude is relatively new. The rates obtainable in metals as a result of laser irradiation have been estimated to be of the order of 1010 K/sec (for nanosecond laser pulses) in the critical temperature region of high nucleation rate and low viscosity. Some less sophisticated estimates for laser annealing of silicon with picosecond pulses yield values of 1012 – 1013 K/sec.. The recent measurements of the surface colour temperature in laser irradiated metals suggest cooling rates of the order of 1010K/sec in both nanosecond and picosecond regimes.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 80: Symposium G – Science and Technology of Rapidly Quenched Alloys , 1986 , 203
Copyright
Copyright © Materials Research Society 1987

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References

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