Influence of defects on the irreversible phase transition in Fe–Pd ferromagnetic shape memory alloys

Pérez-Landazábal, J.I.; Lambri, O.A.; Bonifacich, Federico Guillermo; Sánchez-Alarcos, V.; Tarditti, F.

doi:10.1016/j.actamat.2014.11.054

Cited by 18 publications

(38 citation statements)

References 62 publications

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“…After several thermal cycles up to different maximum temperatures, appreciable changes in the height and temperature of the MT from DSC thermograms were not detected [25]. A change in less than 3 K for the MT temperature was detected in the two alloys.…”

Section: Resultsmentioning

confidence: 85%

“…During the second heating run up to the same temperature of the first, this peak decreases its height markedly in both alloys. In fact, this peak has been reported as P 1 [24][25][26]. The mechanism of the P 1 peak was related with a dislocation dragging mechanisms controlled by the migration of vacancies without break-away and is related to the intrinsic properties of the austenitic phase [25].…”

Section: Resultsmentioning

confidence: 99%

“…In fact, this peak has been reported as P 1 [24][25][26]. The mechanism of the P 1 peak was related with a dislocation dragging mechanisms controlled by the migration of vacancies without break-away and is related to the intrinsic properties of the austenitic phase [25]. Therefore, the net peak height (after background subtraction) is lower in a matrix with BCT phase than in a matrix without BCT phase, since the BCT phase is still present overlapped to the austenite matrix.…”

Section: Resultsmentioning

confidence: 99%

“…These thermograms show a series of peaks which correspond to the FCT-BCT transformation in FePdCo alloy. The approximate temperatures for the appearance of the non-thermoeleastic MT were 190 K and 240 K for FePdCo and FePdMn, respectively [13,14,25,26]. The FCT-BCT transformation is non-thermoelastic and the appearing BCT phase will remain (degrading the shape memory properties) unless the alloy is annealed at high temperature and subsequently quenched [6].…”

Section: Resultsmentioning

confidence: 99%

“…Then the larger the quantity of dislocations in the alloy, the easier should be the irreversible transition to the BCT phase. So it could be expected that a low density of dislocations must produce a reduction in the transition temperature [25]. In order to study the influence of the non-thermoelastic MT on thermoelastic MT, mechanical spectroscopy measurement from temperatures below the FCT-BCT transformation temperature were carried out.…”

Section: Resultsmentioning

confidence: 99%

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

et al. 2018

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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 Fe 70 Pd 30 , 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-indefects 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 Fe 67 Pd 30 Co 3 and Fe 66.8 Pd 30.7 Mn 2.5 ferromagnetic shape memory alloys.

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Section: Resultsmentioning

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

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

et al. 2018

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Strain Amplitude Dependence of Internal Friction in a Cu–Al–Mn Shape Memory Alloy

Jiao

Yin

Zhang

et al. 2022

Physica Status Solidi (a)

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Strain amplitude (SA) dependence of internal friction (IF) in a Cu–Al–Mn shape memory alloy (SMA) is investigated. Microstructure observation is conducted with the aim to clarify related mechanisms. It is found that the IF measured during the continuous heating process shows a nonmonotonous dependence on SA, that is, the IF increases first and then decreases. The increase of IF can be attributed to the mergence of martensite laths promoted by the reorientation of martensite variants, whereas the decrease of IF is related to the decrease in the density of moveable interfaces. The isothermal IF measured at low temperatures increases monotonously with the increase in SA, because the density of movable interfaces and the sliding distance of these interfaces in the tangential direction increase. Thermal cycles can significantly improve the isothermal IF because of the annihilation of quenched‐in vacancies and the reorientation of martensite variants. At around 240 °C, the isothermal IF in all specimens shows a nonmonotonous dependence on SA, which can be ascribed to the dragging effect of quenched‐in vacancies on dislocations and the breakaway of dislocations from these vacancies when the SA is high enough.

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Microstructure and Phase Transformation Behaviour of Co–Ni–Al Alloy by Spark Plasma Sintering

Arputhavalli

Agilan²,

Johnson³

2017

Springer Proceedings in Physics

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Influence of defects on the irreversible phase transition in Fe–Pd ferromagnetic shape memory alloys

Cited by 18 publications

References 62 publications

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

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

Strain Amplitude Dependence of Internal Friction in a Cu–Al–Mn Shape Memory Alloy

Microstructure and Phase Transformation Behaviour of Co–Ni–Al Alloy by Spark Plasma Sintering

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