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The Effect of the Rate of Cooling on the Allotropic Transformation Temperatures of Uranium

Duwez, Pol (1953) The Effect of the Rate of Cooling on the Allotropic Transformation Temperatures of Uranium. Journal of Applied Physics, 24 (2). pp. 152-156. ISSN 0021-8979. doi:10.1063/1.1721230.

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Allotropic transformation in uranium has been studied over a range of cooling rates from 5 to about 8000°C/sec. The transformation temperatures of both gamma‐to‐beta and beta‐to‐alpha were found to decrease continuously with increasing rates of cooling. The extent of the beta‐range increased with increasing cooling rates. For rates of cooling up to 1000°C/sec, recalescence was observed in both transformations. For higher cooling rates, there was usually no recalescence. In most of the recorded cooling curves, a small but definite thermal arrest was observed, between the two main arrests which correspond to the two known phase transformations. This additional thermal arrest was also present in a heating curve, where it occurred at about 740°C, compared with 666 and 771°C for the two known phase transformations. Possible explanations of the additional arrest are discussed.

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Additional Information:© 1953 American Institute of Physics. Received 11 August 1952. This paper is based on studies conducted for the U. S. Atomic Energy Commission on Contract No. AT-11-1-GEN-8. The experiments were performed with equipment constructed at California Institute of Technology under Contract No. N6onr-24430 with the Office of Naval Research, U. S. Navy.
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U.S. Atomic Energy CommissionAT-11-1-GEN-8
Office of Naval Research (ONR)N6onr-24430
Issue or Number:2
Record Number:CaltechAUTHORS:20131217-101900389
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43039
Deposited By: Tony Diaz
Deposited On:17 Dec 2013 18:28
Last Modified:10 Nov 2021 16:32

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