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Laser Anneal and the Amorphous-Crystalline Transition in the Cu60-Zr40 Alloy System

Published online by Cambridge University Press:  21 February 2011

Monde A. Otooni
Monde A. Otooni*
Affiliation:
U.S. Army Armament Research And Development Center, M&Mt Division, Metallic tMaterials Branch, Dover, New Jersey 07801
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Abstract

Recently, significant advances have been made in establishing a theoretical basis for explaining the many structural-sensitive physical properties of amorphous materials. Viewed from both the theoretical and experimental realms, reversible annealing dependency and the structural relaxation mechanism of the amorphous solids are conceptually deducible from the concept of localized structural fluctuations. In the case of annealing, however, the limiting temperature below which no permanent atomiclevel rearrangements occur is not known and may well be dependent on several intrinsic properties of the amorphous state. In an effort to establish this limiting temperature, amorphous Cu60-Zr 40 samples have been annealed using a 1kv pulsed laser. Samples annealed during 1200, 800, 600 400, and 200 μ sec. have been analyzed by using Differential Scanning Calorimetry (DSC), High Resolution Electron Microscopy (HREM), and microanalysis. Analysis of the DSC indicates variations in both height and the shape of the exotherms from the samples annealed above 600 μ sec. duration. The results from HREM of these samples indicate the onset of amorphous-crystalline transition evidenced during 200 μ sec. annealing.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 28: Symposium F – Rapidly Solidified Metastable Materials , 1983 , 285
Copyright
Copyright © Materials Research Society 1984

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References

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