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Role of valence electrons in phase transformation kinetics of thallium and its dilute alloysThe kinetics of the phase transformation of thallium and its dilute alloys were investigated using XRD and calorimetry. Pure thallium exhibits a beta(bcc) to alpha(hcp) phase transformation on cooling at 508 K. With alloying additions, the crystal structure for each phase does not change, although the size of the unit cell increases. The enthalpy and the temperature of phase transformation of each alloy have been determined. The chemical free energy change associated with the phase transformation of each alloy was calculated. The valence electrons make an outstanding contribution to the chemical free energy change required for the phase change.
Document ID
19920040466
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Ahmed, R.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Ahmed, S.
(Youngstown State University OH, United States)
Date Acquired
August 15, 2013
Publication Date
December 1, 1991
Publication Information
Publication: Materials Science and Technology
Volume: 7
ISSN: 0267-0836
Subject Category
Metallic Materials
Accession Number
92A23090
Distribution Limits
Public
Copyright
Other

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