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Acoustic-Assisted, Magnetic-Field-Induced Strain and Stress Output of Ni-Mn-Ga
|Ratchatee Techapiesancharoenkij 1, Jari T. Kostamo 2, Jesse Simon 3, Samuel M. Allen 1, Robert O'Handley 1|
1. Massachusetts Institute of Technology,Department of Materials Science and Eng. (MIT), 77 massachusetts avenue, Cambridge, MA 02139, United States
The effect of acoustic energy input from a piezoelectric actuator on the magnetic-field-induced strain (MFIS) of Ni-Mn-Ga ferromagnetic shape memory alloys (FSMAs) is observed to enhance the MFIS performance . The threshold field required to induce twin boundary motion is reduced by this new technique by up to 1 kOe. The twinning-yield stress is also reduced by the technique by up to 0.5 MPa. The significant reduction in the twinning stress or the threshold field by the acoustic-assistance is beneficial to reduce the size of a FSMA actuator with a given output. To appreciate the benefit of the acoustic-assistance better, the stress and strain output of the FSMA actuation under acoustic-assist is studied.
Presentation: Oral at E-MRS Fall Meeting 2007, Symposium E, by Ratchatee Techapiesancharoenkij
See On-line Journal of E-MRS Fall Meeting 2007
Submitted: 2007-05-14 04:43 Revised: 2009-06-07 00:44