ELECTROMECHANICAL COUPLING COEFFICIENT (K33) of A Fe-Ga MAGNETOSTRICTIVE ALLOY

Acta Metall Sin

2007, Vol. 43

Issue (4): 413-416 DOI:

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ELECTROMECHANICAL COUPLING COEFFICIENT (K33) of A Fe-Ga MAGNETOSTRICTIVE ALLOY

BAI Xia-Bing 白夏冰;

北京航空航天大学

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BAI Xia-Bing. ELECTROMECHANICAL COUPLING COEFFICIENT (K33) of A Fe-Ga MAGNETOSTRICTIVE ALLOY. Acta Metall Sin, 2007, 43(4): 413-416 .

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Abstract Fe81Ga19 magnetostrictive oriented crystalline have been prepared by zone melting unidirectional solidification. Vacuum annealing at 900°C for 3h has been carried out followed by oil quenching. The electromechanical coupling coefficient (k33) is determined by the impedance resonance frequency tested using AC impedance instrument. With the increase of DC magnetic field, K33 is increased appreciably with the value of 0.126 for 327Oe, 0.129 for 481Oe and 0.133 for 636Oe. Respectively with the increase of stress from 0MPa to 15MPa, K33 remains unchanged in 327Oe, but in 636Oe K33 is increased obviously. Heat treatment at 900°C for 3h followed by oil quenching, K33 is improved with the value of 0.157 in 636Oe magnetic field and 15Mpa stress. Surface quality of sample affects the AC impedance curve and it is hard to measure the K33 of defective sample.

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Received: 11 September 2006

ZTFLH:

TG111， TG113

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2007/V43/I4/413

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