Showing papers by "Xiang Qi published in 2003"

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

Abstract: This letter reports on a study of the magnetomechanical and thermomechanical behavior of a Co–32Ni single crystal When magnetized along the [001]fcc direction at room temperature in austenite coexited with martensitic state, field-induced strains as high as 42% 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]fcc direction at room temperature to a prestrain of 54%, about 15% strain was recovered during subsequent heating, yielding a recovery rate of 278% 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