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| Effects of Ni Addition on the Microstructures and Magnetic Properties of Fe70-xPd30Nix High-Temperature Ferromagnetic Shape Memory Alloys |
| Journal of Magnetics, Volume 17, Number 2, 30 Jun 2012, Pages 86-95 |
Chien-Feng Lin *  (Department of Mechanical and Automatic Engineering, National Kaohsiung First University of Science and Technology), Jin-Bin Yang (Department of Mechanical and Automatic Engineering, National Kaohsiung First University of Science and Technology) |
| Abstract |
| This study investigated the effects of adding a third alloying element, Ni, to create Fe70-xPd30Nix (x = 2, 4, 6, 8 at.% Ni) ferromagnetic shape memory alloys (FSMAs). The Ni replaced a portion of the Fe. The Fe70-xPd30Nix alloys were homogenized through hot and cold forging to gain a ~38% reduction in thickness, next they were solution-treated (ST) with annealing recrystallization at 1100 oC for 8 h and quenched in ice brine, and then aged at 500 oC for 100 h. Investigation of the microstructures and magnetostriction indicated that the greater Ni amount in the Fe70-xPd30Nix alloys reduced saturation magnetostriction at room temperature (RT). It was also observed that it was more difficult to generate annealed recrystallization. However, with greater Ni addition into the Fe70-xPd30Nix (x = 6, 8 at.% Ni) alloys, the L10+L1m twin phase decomposition into stoichiometric L10+L1m+αbct structures was suppressed after the 500 oC/100 h aging treatment. The result was that the Fe70-xPd30Nix (x = 6, 8 at.% Ni) alloys maintained a high magnetostriction and magnetostrictive susceptibility (Δλ|| s/ΔH) after the alloys were aged at 500 oC for 100 h. This magnetic property of the Fe70-xPd30Nix (x = 6, 8 at.% Ni) alloys make it suitable for application in a high temperature (T > 500 oC) and high frequency environments. |
| Keywords: Fe70-xPd30Nix alloys; SEM and TEM microstructures; x-ray diffraction; high-temperature magnetostriction |
| DOI: http://dx.doi.org/10.4283/JMAG.2012.17.2.086 |
| Full Text: PDF |
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