Magnetic age hardening of cold-deformed bulk equiatomic Fe–Pd intermetallics during isothermal annealing

Deshpande, A.R.; Wiezorek, J.M.K.

doi:10.1016/j.jmmm.2003.08.013

Cited by 26 publications

(14 citation statements)

References 7 publications

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“…Here we focus on the study of the L1 0ordering intermetallic. deformation and previously reported on the microstructure and property evolution after colddeformation of the FCC solid solution, the CR-route, which produces extraordinary grain refinement and significant enhancement in the magnetic coercivity relative to conventionally processed material [7][8][9]. We have used equiatomic FePd to study the annealing behavior of L1 0 -ordering intermetallics after cold-Nearly equiaxed L1 0 ordered grains L1 0 ordered region transformed by the conventional ordering mode Nearly equiaxed L1 0 ordered grains L1 0 ordered region transformed by the conventional ordering mode Fig.…”

Section: Introductionmentioning

confidence: 89%

“…Equiatomic Fe-Pd buttons have been prepared from high-purity elemental starting materials (Pd 99.95% and Fe 99.98% purity) [9]. To perform conventional annealing in the L1 0 ordered condition, FCC-FePd was cold rolled to about 50% reduction in thickness, followed by heat treatment at 773K for 45 hours to achieve an ordered structure, exploiting the CR transformation mode.…”

Section: Methodsmentioning

confidence: 99%

“…The FePd system offers model alloys to investigate systematically the annealing behavior of both L1 0 -and L1 2 -ordering intermetallics [7]. For compositions of about 50 atomic % Pd and 75atomic % Pd concentrated FCC solid solutions exist, which upon cooling below composition dependent temperatures, T 0 , form an L1 0 -phase FePd (T 0 ≈ 923K for Fe 50 Pd 50 ) and an L1 2 -phase FePd 3 (T 0 ≈ 990K for Fe 25 Pd 75 ).…”

Section: Introductionmentioning

confidence: 99%

“…For compositions of about 50 atomic % Pd and 75atomic % Pd concentrated FCC solid solutions exist, which upon cooling below composition dependent temperatures, T 0 , form an L1 0 -phase FePd (T 0 ≈ 923K for Fe 50 Pd 50 ) and an L1 2 -phase FePd 3 (T 0 ≈ 990K for Fe 25 Pd 75 ). Two different thermo-mechanical routes exist to establish polycrystalline microstructures with equiaxed morphology in the L1 0 ordering FePd during annealing at temperatures below T 0 [7]: (i) A combined reaction (CR) of FCC → L1 0 phase transformation concomitant with the annealing of defects introduced in the cold-deformed metastable FCC phase; (ii) Annealing of the L1 0 ordered cold-deformed microstructure. Here we focus on the study of the L1 0ordering intermetallic.…”

Section: Introductionmentioning

confidence: 99%

“…Conveniently, the ordered phases exhibit considerable ductility, at least under compressive and rolling constraint [7]. 1: L1 0 FePd prior to cold deformation [7]. Two different thermo-mechanical routes exist to establish polycrystalline microstructures with equiaxed morphology in the L1 0 ordering FePd during annealing at temperatures below T 0 [7]: (i) A combined reaction (CR) of FCC → L1 0 phase transformation concomitant with the annealing of defects introduced in the cold-deformed metastable FCC phase; (ii) Annealing of the L1 0 ordered cold-deformed microstructure.…”

Section: Introductionmentioning

confidence: 99%

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Cold-Deformation and Annealing of equiaxed L1o-ordered FePd Intermetallics

Desphande

Wiezorek

2006

MRS Proc.

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The L1 0 ordering equiatomic intermetallic FePd has been used as a model system for the investigation of the evolution of microstructure and properties during annealing at temperatures below the ordering temperature after cold deformation. The two different routes for the preparation of equiaxed L1 0 FePd polycrystals, annealing after cold deformation in the disordered FCC state or after cold deformation in the ordered state, produce similar grain size distributions, differ in the transformation kinetics and in the sequence of texture evolution during the post-cold-deformation annealing. Cold deformed L1 0 FePd progresses through the classic stages of annealing known from studies of disordered elemental metals and alloys based on them. The reduced long range order parameter of the 'mechanically disordered' FePd is recovered in the early stages of annealing and both the recrystallization and the grain growth stages are quite sluggish, presumably because of the slow diffusion processes in the L1 0 lattice. Mater. Res. Soc. Symp. Proc. Vol. 980

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Section: Introductionmentioning

confidence: 89%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cold-Deformation and Annealing of equiaxed L1o-ordered FePd Intermetallics

Desphande

Wiezorek

2006

MRS Proc.

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Optimization of the Magnetic Properties of FePd Alloys by Severe Plastic Deformation

et al. 2010

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A FePd alloy was nanostructured by severe plastic deformation following two different routes: ordered and disordered states were processed by high pressure torsion (HPT). A grain size in a range of 50 to 150 nm is obtained in both cases. Severe plastic deformation induces some significant disordering of the long range ordered L1 0 phase. However, Transmission Electron Microscopy (TEM) data clearly show that few ordered nanocrystals remain in the deformed state. The deformed materials were annealed to achieve nanostructured long range ordered alloys. The transformation proceeds via a first order transition characterized by the nucleation of numerous ordered domains along grain boundaries. The influence of the annealing conditions (temperature and time) on the coercivity was studied for both routes. It is demonstrated that starting with the disorder state prior to HPT and annealing at low temperature (400°C) leads to the highest coercivity (about 1.8 kOe).

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