Influence of defects on the irreversible phase transition in the Fe-Pd doped with Co and Mn

The appearance of BCT martensite in Fe-Pd-based ferromagnetic shape memory alloys, which develops at lower temperatures than the thermoelastic martensitic transition, deteriorates the shape memory properties. In a previous work performed in Fe₇₀Pd₃₀, it was shown that a reduction in defects density reduces the non thermoelastic FCT-BCT transformation temperature. In the present work, the influence of quenched-in-defects upon the intensity and temperature of the thermoelastic martensitic (FCC-FCT) and the non thermoelastic (FCT-BCT) transitions in Fe-Pd doped with Co and Mn is studied. Differential scanning calorimetric and mechanical spectroscopy studies demonstrate that a reduction in the dislocation density the stability range of the FCC-FCT reversible transformation in Fe₆₇Pd₃₀Co₃ and Fe_66.8Pd_30.7Mn_2.5 ferromagnetic shape memory alloys.

Keywords
Fe-Pd-Co; Fe-Pd-Mn; ferromagnetic shape memory alloys; martensitic transformation; dislocation dynamics

Authorship

Federico Guillermo Bonifacich Federico Guillermo Bonifacich

CONICET-UNR-Laboratorio de Materiales, Escuela de Ingeniería Eléctrica, Centro de Tecnología e Investigación Eléctrica, Facultad de Ciencias Exactas, Ingeniería y Agrimensura, Avda. Pellegrini 250, CP: 2000, Rosario, Santa Fe, Argentina. e-mail: bonifaci@fceia.unr.edu.ar; olambri@fceia.unr.edu.ar; gargi@fceia.unr.edu.ar; gizelada@fceia.unr.edu.arUNRArgentinaRosario, Santa Fe, ArgentinaCONICET-UNR-Laboratorio de Materiales, Escuela de Ingeniería Eléctrica, Centro de Tecnología e Investigación Eléctrica, Facultad de Ciencias Exactas, Ingeniería y Agrimensura, Avda. Pellegrini 250, CP: 2000, Rosario, Santa Fe, Argentina. e-mail: bonifaci@fceia.unr.edu.ar; olambri@fceia.unr.edu.ar; gargi@fceia.unr.edu.ar; gizelada@fceia.unr.edu.ar

Osvaldo Agustín Lambri

Damián Gargicevich

Griselda Irene Zelada

José Ignacio Pérez-Landazábal

Departamento de Física, Universidad Pública de Navarra, Campus de Arrosadía 31006, Pamplona, Navarra, Spain.Universidad Pública de NavarraSpainPamplona, Navarra, SpainDepartamento de Física, Universidad Pública de Navarra, Campus de Arrosadía 31006, Pamplona, Navarra, Spain.

Institute for Advanced Materials (INAMAT), Universidad Pública de Navarra, Campus de Arrosadía 31006, Pamplona, Navarra, Spain. e-mail: ipzlanda@unavarra.es; recarte@unavarra.es; vicente.sanchez@unavarra.esUniversidad Pública de NavarraSpainPamplona, Navarra, SpainInstitute for Advanced Materials (INAMAT), Universidad Pública de Navarra, Campus de Arrosadía 31006, Pamplona, Navarra, Spain. e-mail: ipzlanda@unavarra.es; recarte@unavarra.es; vicente.sanchez@unavarra.es

Vicente Recarte

Vicente Sánchez-Alarcos

Federico Guillermo Bonifacich

SCIMAGO INSTITUTIONS RANKINGS

Figures | Formulas

Figures (8)
Formulas (3)

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Figure 1
Schematic representation of the experimental device used during mechanical spectroscopy measurement. S: sample. G: jaws B: excitation coils. E: masses for variable moment of inertia. Taken from Ref. [²¹21 LAMBRI, O.A. “Intensidad de Relajación en Materiales con Estructura Cúbica Centrada en el Cuerpo”, Ph.D. Thesis, Universidad Nacional de Rosario, Argentina, 1993.].

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Figura 2
Heat flux (HF) as a function of temperature during the DSC measurement for (a) FePdCo and (b) FePdMn from a temperature higher than the non-thermoelastic MT temperature up to different maximum temperatures. Arrows indicate the MT and Tc temperatures. The inset shows a magnification of the MT temperature range.

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Figura 3
DSC thermograms performed down to temperatures lower than the non-thermoelastic transformation temperature for FePdCo and FePdMn.

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Figura 4
Damping spectra (a) and squared frequency curves (b) as a function of temperature during successive thermal cycles for a FePdCo alloy from 170 K up to different final temperatures. Lines are a guide for the eyes.

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Figura 5
Damping spectra (a) and squared frequency curves (b) as a function of temperature during successive thermal cycles for a FePdMn alloy from 170 K up to different final temperatures. Lines are a guide for the eyes.

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Figura 6
S parameter as a function of temperature for the as-quenched (circles) and annealed at 603 K (open circles) state for a FePdCo and FePdMn alloys. Lines are a guide for the eyes.

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Figure 7
Arrhenius plot for FePdCo and FePdMn alloys related to P₁ peak.

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Figure 8
FCT-BCT transformation temperature as a function of the maximum temperature of the thermal cycles. See explanation in the text.

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(1)

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(2)

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(1)

Figure 1 Schematic representation of the experimental device used during mechanical spectroscopy measurement. S: sample. G: jaws B: excitation coils. E: masses for variable moment of inertia. Taken from Ref. [²¹21 LAMBRI, O.A. “Intensidad de Relajación en Materiales con Estructura Cúbica Centrada en el Cuerpo”, Ph.D. Thesis, Universidad Nacional de Rosario, Argentina, 1993.].

Figura 2 Heat flux (HF) as a function of temperature during the DSC measurement for (a) FePdCo and (b) FePdMn from a temperature higher than the non-thermoelastic MT temperature up to different maximum temperatures. Arrows indicate the MT and Tc temperatures. The inset shows a magnification of the MT temperature range.

Figura 3 DSC thermograms performed down to temperatures lower than the non-thermoelastic transformation temperature for FePdCo and FePdMn.

Figura 4 Damping spectra (a) and squared frequency curves (b) as a function of temperature during successive thermal cycles for a FePdCo alloy from 170 K up to different final temperatures. Lines are a guide for the eyes.

Figura 5 Damping spectra (a) and squared frequency curves (b) as a function of temperature during successive thermal cycles for a FePdMn alloy from 170 K up to different final temperatures. Lines are a guide for the eyes.

Figura 6 S parameter as a function of temperature for the as-quenched (circles) and annealed at 603 K (open circles) state for a FePdCo and FePdMn alloys. Lines are a guide for the eyes.

Figure 7 Arrhenius plot for FePdCo and FePdMn alloys related to P₁ peak.

Figure 8 FCT-BCT transformation temperature as a function of the maximum temperature of the thermal cycles. See explanation in the text.

(1)

l n (A_{n}) = l n (A_{0}) - n π Q^{- 1}

(2)

Q^{- 1} (ε_{0}) = \frac{1}{π} \frac{d (1 n (A_{n}))}{d n}

(1)

S = \frac{∆ Q^{- 1}}{∆ ε_{0}}

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Influence of defects on the irreversible phase transition in the Fe-Pd doped with Co and Mn

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[1] Federico Guillermo Bonifacich