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

Zhou, W. M.; Liu, Y.; Jiang, B. H.; Qi, X.; Liu, Y. N.
February 2003
Applied Physics Letters;2/3/2003, Vol. 82 Issue 5, p760
Academic Journal
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.


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