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Microshear banding in shock-consolidated microcrystalline alloy powders

Thadhani, N. N. and Vreeland, T., Jr. (1986) Microshear banding in shock-consolidated microcrystalline alloy powders. Acta Metallurgica, 34 (12). pp. 2323-2334. ISSN 0001-6160. doi:10.1016/0001-6160(86)90135-5.

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Microshear bands (<0.02–0.03 μm thick), formed as a result of inhomogeneous plastic deformation within heavily deformed powder particle interiors, are observed during shock consolidation of microcrystalline Markomet 1064 (Ni_(55.8) Mo_(25.7) Cr_(9.7) B_(8.8)), and nickel based superalloys Pyromet 718 and Rene 95. Although part of the shock energy is utilized in melting of particle surfaces due to preferential plastic deformation near interfaces, a nonnegligible amount of energy is dissipated in plastic deformation within particle interiors. This involves localized regions of shear which are manifested as fine microshear bands of heavily twinned material, confined within individual powder particles. The thickness and length of the microshear bands is more than several orders of magnitude smaller than that in the macroscopic bands observed in materials subjected to unconstrained high-strain-rate deformation. The small size of the shear bands is attributed to the fact that the particle strain is limited, as individual powder particles are deformed to conform to their neighbors in the shock consolidation process.

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Additional Information:© 1986 Pergamon Journals Ltd. Received March 31, 1986. This work was supported in part by the National Science Foundation under the Materials Research Group grant DMR 8421119. Mr Michael A. Long produced the shock consolidated samples using the facilities of Professor Thomas A. Ahrens in the Caltech Seismological Laboratories. Professor Brent Fultz reviewed the manuscript and provided helpful interpretations of the TEM micrographs.
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NSFDMR 8421119
Issue or Number:12
Record Number:CaltechAUTHORS:20150223-134804556
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Official Citation:N.N. Thadhani, T. Vreeland Jr, Microshear banding in shock-consolidated microcrystalline alloy powders, Acta Metallurgica, Volume 34, Issue 12, December 1986, Pages 2323-2334, ISSN 0001-6160, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55109
Deposited By: Tony Diaz
Deposited On:23 Feb 2015 22:06
Last Modified:10 Nov 2021 20:41

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