TITLE

Magnetoelastic and thermoelastic shape memory effect in a Co–Ni single crystal

AUTHOR(S)
Zhou, W. M.; Liu, Y.; Jiang, B. H.; Qi, X.; Liu, Y. N.
PUB. DATE
February 2003
SOURCE
Applied Physics Letters;2/3/2003, Vol. 82 Issue 5, p760
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
This letter reports on a study of the magnetomechanical and thermomechanical behavior of a Co-32Ni single crystal. When magnetized along the [001][sub fcc] direction at room temperature in austenite coexited with martensitic state, field-induced strains as high as 4.2% were measured at a field of 12 kOe. The magnetic field-induced strains were recovered during demagnetization, exhibiting a magnetic hysteresis of 5-6 kOe. No field-induced strain was detected if a magnetic field was loaded along another direction. When deformed in compression along the [001][sub fcc] direction at room temperature to a prestrain of 5.4%, about 1.5% strain was recovered during subsequent heating, yielding a recovery rate of 27.8%. For specimens deformed in other crystal directions, no obvious recoverable strain was measured. These experimental phenomena are discussed and interpreted in terms of reversible motions of Shockley partial dislocations.
ACCESSION #
8989249

 

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