Effects of Ni addition on the magnetostriction and microstructures of Fe70−xPd30Nix high-temperature ferromagnetic shape memory alloys

Lin, Yin-Chih; Lin, Chien-Feng

doi:doi:10.1063/1.3669915

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Journal of Applied Physics / Volume 111 / Issue 7 / PROCEEDINGS OF THE 56TH ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS / Magneto-Optic, Magnetoelastic, and Magnetocaloric Materials

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J. Appl. Phys. 111, 07A902 (2012); http://dx.doi.org/10.1063/1.3669915 (3 pages)

Effects of Ni addition on the magnetostriction and microstructures of Fe_70−xPd₃₀Ni_x high-temperature ferromagnetic shape memory alloys

Yin-Chih Lin¹ and Chien-Feng Lin²

¹Department of Mold and Die Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung, Taiwan
²Department of Mechanical and Automatic Engineering, National Kaohsiung First University of Science and Technology, Kaohsiung, Taiwan

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(Received 10 September 2011; accepted 26 September 2011; published online 3 February 2012)

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Abstract

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This study investigated the effects of adding a third alloying element, Ni, to create Fe_70−xPd₃₀Ni_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−xPd₃₀Ni_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−xPd₃₀Ni_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-xPd₃₀Ni_x (x = 6 and 8 at. % Ni) alloys, the L1₀ + L1_m twin phase decomposition into stoichiometric L1₀ + 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−xPd₃₀Ni_x (x = 6 and 8 at. % Ni) alloys maintained a high magnetostriction and magnetostrictive susceptibility (Δλ_‖^s/ΔH) after the 500 °C/100 h aged treatment. This magnetic property of the Fe_70−xPd₃₀Ni_x (x = 6 and 8 at. % Ni) alloys is suitable for application in a high temperature (T > 500 °C) and high frequency environment.

KEYWORDS, PACS, and IPC

Keywords

ageing, alloying additions, annealing, crystal microstructure, ferromagnetic materials, iron alloys, magnetic susceptibility, magnetostriction, nickel alloys, palladium alloys, pyrolysis, recrystallisation, shape memory effects, stoichiometry

PACS

75.80.+q

Magnetomechanical effects, magnetostriction
75.30.Cr

Saturation moments and magnetic susceptibilities
81.40.Ef

Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization
82.30.Lp

Decomposition reactions (pyrolysis, dissociation, and fragmentation)
61.66.Bi

Elemental solids
61.66.Dk

Alloys
62.20.fg

Shape-memory effect; yield stress; superelasticity

International Patent Classification (IPC)

C22C38/00
Ferrous alloys, e.g. steel alloys
C21D1/26
Methods of annealing
C22C19/00
Alloys based on nickel or cobalt
H01F1/00
Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties

ARTICLE DATA

Digital Object Identifier

http://dx.doi.org/10.1063/1.3669915

PUBLICATION DATA

ISSN

0021-8979 (print)

1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef

American Institute of Physics

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