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Deformation of as-cast LiF-22 mol pct CaF2 hypereutectic salt between 500 and 1015 KResults are presented on compression tests conducted on as-cast LiF-22 mol pct CaF2 hypereutectic specimens at nominal strain rates between 1.8 x 10 to the -6th/sec and 0.25/sec over the temperature range 500-1015 K. In all instances, the stress-strain curves showed broad maxima, with negative strain-hardening rates after the peak stress sigma(max). It was found that, at low temperatures and high stresses, the CaF2 lamellae are rigid while the LiF matrix exhibits extensive transgranular cavitation, while at high temperatures and low stresses the CaF2 lamellae break down and spheroidize while the LiF matrix does not cavitate. It was concluded that the mechanical properties of the as-cast hypereutectic LiF-22 mol pct CaF2 are governed by the rate of deformation of the CaF2 phase. It is suggested that, for thermal energy storage applications, a spheroidal microstructure is more desirable than a lamellar structure.
Document ID
19900062031
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Raj, S. V.
(NASA Lewis Research Center Cleveland, OH, United States)
Whittenberger, J. D.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1990
Publication Information
Publication: Materials Science and Engineering, Part A - Structural Materials: Properties, Microstructure and Processing
Volume: 124
ISSN: 0921-5093
Subject Category
Nonmetallic Materials
Accession Number
90A49086
Funding Number(s)
CONTRACT_GRANT: NCC3-72
Distribution Limits
Public
Copyright
Other

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