ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
High Temperature Elastic Constants of α-Fe Single Crystal Studied by Electromagnetic Acoustic Resonance
Ryuichi TarumiKazuya ShiraishiMasahiko Hirao
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2009 Volume 49 Issue 9 Pages 1432-1435

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Abstract

Complete set of elastic constants Cij of α-Fe single crystal have been investigated from ambient temperature up to 893 K by electromagnetic acoustic resonance. Longitudinal component of elastic constants C11 showed linear temperature behavior and the magnitude of elastic softening was approximately 13%. The remainning two shear moduli, C44 and C′, however showed highly nonlinear behaviors with significant softenings of 50%. On a Blackman diagram, elastic constant ratios at high temperatures move to a limit, C12/C11=1 and C44/C11=0, where Born's two lattice instability criteria have been satisfied simultaneously. Violation of Cauchy relation is also significant upon heating.

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© 2009 by The Iron and Steel Institute of Japan
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