This study investigated the effects of adding a third alloying element, Ni, to create Fe 70-x Pd 30 Ni x (x = 2, 4, 6, and 8 at. % Ni) ferromagnetic shape memory alloys. The Ni replaced a portion of the Fe. The magnetostriction and microstructures of Fe 70-x Pd 30 Ni x high-temperature ferromagnetic shape memory alloys were studied in detail. Investigation of the magnetostriction and microstructures indicated that the greater Ni amount in the Fe 70-x Pd 30 Ni x alloys caused the less saturation magnetostriction at room temperature (RT); it was also observed that it was more difficult to generate an annealed recrystallization. However, greater Ni addition into the Fe 70-x Pd 30 Ni x (x = 6 and 8 at. % Ni) alloys, the L1 0 + L1 m twin phase decomposition into stoichiometric L1 0 + L1 m + α bct structures could be suppressed when the alloys were aged at 500 °C for 100 h. The result was that the Fe 70-x Pd 30 Ni x (x = 6 and 8 at. % Ni) alloys maintained a high magnetostriction and magnetostrictive susceptibility (Δλ ∥ s /Δ H ) after the 500 °C/100 h aged treatment. This magnetic property of the Fe 70-x Pd 30 Ni x (x = 6 and 8 at. % Ni) alloys is suitable for application in a high temperature ( T > 500 °C) and high frequency environment.
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Effects of Ni addition on the magnetostriction and microstructures of Fe 70-x Pd 30 Ni x high-temperature ferromagnetic shape memory alloys
Lin, Yin-Chih; Lin, Chien-Feng
Follow Journal of Applied Physics
, Volume 111 (7)
American Institute of Physics – Apr 1, 2012
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