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Shock Consolidation of a Glass-Forming Crystalline Powder

Vreeland, T., Jr. and Kasiraj, P. and Mutz, A. H. and Thadhani, N. N. (1986) Shock Consolidation of a Glass-Forming Crystalline Powder. In: Metallurgical Applications of Shock-Wave and High-Strain-Rate Phenomena. Marcel Dekker , New York, NY, pp. 231-246. ISBN 9780824776121.

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Plane shock waves were employed to consolidate a microcrystalline Markomet 1064 alloy powder (~50 μm particle size, Ni_(55.8)Mo_(25.7)_Cr_(9.7) B_(8.8)) with shock energies ranging from 210-595 kJ/kg. Metallurgical examination of the compacts reveals amorphous regions at particle junctions and interparticle boundaries which formed from shock melted material. A fine microcrystalline region was observed near the center of the larger amorphous regions. The volume fraction of the melt (amorphous + fine microcrystalline regions) increases from 0.006 to 0.28 over the energy range employed. The maximum metallic glass fraction retained was approximately 20% at energies near the maximum employed. The thermal history of spherical particles flux during the shock rise time was calculated. melt fraction, assuming all of the shock energy subject to constant energy The numerically predicted was input at the particle surface, is large than the experimentally measured melt fraction at low energies. TEM observations on the consolidated powder indicate extensive slip and deformation by twinning. The present melt fraction measurements indicate that while the shock energy is preferentially deposited near particle surfaces, a significant fraction of shock energy is also dissipated in plastic deformation of particle interiors.

Item Type:Book Section
Additional Information:© 1986 by Marcel Dekker, Inc. This work was supported by the National Science Foundation grant DMR-9315214 and the Caltech Program in Advanced Technologies. Professor Thomas J. Ahrens made available his 20 mm gun facilities in the Caltech Seismological Laboratories for the powder consolidation experiments. Professor Jean-Paul Revel, Caltech, made available the SEM and TEM/STEM instruments for use in characterizing the powders and compacts. Ms. Lyn E. Lowry of the Jet Propulsion Laboratory made DSC and DTA measurements on the powders and Dr. Eric Cotts of Caltech made additional DSC measurements for us. The Markomet 1064 powder was supplied by Dr. Bernard H. Kear, Exxon Research and Engineering Company. The authors wish to express their appreciation for this support.
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ID Code:54170
Deposited By: Tony Diaz
Deposited On:28 Jan 2015 20:41
Last Modified:03 Oct 2019 07:55

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