Influence of martensite stabilization on the low-temperature non-linear anelasticity in Cu-Zn-Al shape memory alloys

Kustov, S.; Golyandin, S.; Sapozhnikov, K.; Cesari, E.; Humbeeck, Jan Van; Batist, R. De

doi:10.1016/s1359-6454(02)00131-3

Cited by 37 publications

(24 citation statements)

References 36 publications

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“…[8][9][10][11][12][13][14]. Amplitude dependent damping (ADD) studies are related to the motion of linear/planar defects and therefore it is an ef cient tool to study pinning-related and interaction phenomena.…”

Section: Introductionmentioning

confidence: 99%

Mobility of Twin Boundaries in Fe-Pd-Based Ferromagnetic Shape Memory Alloys

et al. 2016

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The mobility of twin boundaries in (at.%) Fe 70 Pd 30 , Fe 67 Pd 30 Co 3 and Fe 66.8 Pd 30.7 Mn 2.5 has been studied by mechanical spectroscopy. Measurements were carried out in amplitude dependent damping regime. A new model based on the Friedel theory was developed to obtain the activation energy ( 2 kJ/mol) for twin boundaries motion. The model describes the amplitude dependent damping from thermally assisted break-away of dislocations. Interaction processes among twin boundaries, dislocations and vacancies during the recovery of the structure are also discussed. Moreover, a damping peak related to a dislocation dragging mechanism controlled by vacancies migration without break-away, earlier reported in Fe-Pd alloys, was also found in Fe-Pd-Co and Fe-Pd-Mn alloys.

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Section: Introductionmentioning

confidence: 99%

Mobility of Twin Boundaries in Fe-Pd-Based Ferromagnetic Shape Memory Alloys

et al. 2016

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“…%) SMA contains four β' 2 martensite plate variants as well as a small amount of β 2 retained austenite Therefore post-homogenization water quenching enables the formation of an almost fully martensitic structure. After tempering (573K/ 300 sec/ water), it is assumed that most of the martensite transformed to austenite, the amount of which markedly increased, a small part of martensite turned to α 1 bainite, which was identified by means of ( 3 1 1 ) peak, while the rest of martensite became stabilized and remained untransformed [13] .…”

Section: Xrd Patternsmentioning

confidence: 99%

Study of the transitory formation of α 1 bainite, as a precursor of α-phase in tempered SMAs

Bujoreanu

Stanciu

Bârsănescu

et al. 2009

Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies IV

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Bainite transitory formation, during the heating of a martensitic copper base SMA, was predicted by DSC and DTA and confirmed by XRD, OM and TEM only in hot pressed air cooled state homogenized and tempered at 573 K. In this heat treatment state, due to the pre-existence of α-phase, bainite amount is expected to be too low, therefore nondistinguishable, for higher tempering temperatures, where it is suggested that transitory α 1 bainite turned to equilibrium α-phase. The results suggest that bainite formation could be considered as a precursor of α-phase during the heating of Cu-Zn-Al martensitic alloys, with no pre-existing α.

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“…After the aforementioned seminal studies, an important effort was made in several groups pursuing a more clear understanding of the acting mechanisms for a wider range of Cu-based alloys. In line with this aim, Prof. Van Humbeeck´s team has studied several families of alloys, including Cu-Zn-Al [14][15][16][17][18][19][20][21][22], Cu-Al-Ni [23][24][25][26][27][28][29][30], Cu-Al-Be [31][32][33][34][35][36], Cu-Al [37,38], and a comparison of results was presented in [39,40]. Of particular relevance was the finding of the phenomena referred to by these authors as the hyperstabilization of martensites.…”

Section: Introductionmentioning

confidence: 99%

Diffusive Phenomena and the Austenite/Martensite Relative Stability in Cu-Based Shape-Memory Alloys

Pelegrina

Yawny

Sade

2018

Shap. Mem. Superelasticity

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The main characteristic of martensitic phase transitions is the coordinate movement of the atoms which takes place athermally, without the contribution of diffusion during its occurrence. However, the impacts of diffusive phenomena on the relative stability between the phases involved and, consequently, on the associated transformation temperatures and functional properties can be significant. This is particularly evident in the case of Cubased shape-memory alloys where atomic diffusion in both austenite and martensite metastable phases might occur even at room-temperature levels, giving rise to a variety of intensively studied phenomena. In the present study, the progresses made in the understanding of three selected diffusion-related effects of importance in Cu-Zn-Al and Cu-Al-Be alloys are reviewed. They are the after-quench retained disorder in the austenitic structure and its subsequent reordering, the stabilization of the martensite, and the effect of applied stress on the austenitic order. It is shown how the experimental results obtained from tests performed on single crystal material can be rationalized under the shed of a model developed to evaluate the variation of the relative stability between the phases in terms of atom pairs interchanges.

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Influence of martensite stabilization on the low-temperature non-linear anelasticity in Cu-Zn-Al shape memory alloys

Cited by 37 publications

References 36 publications

Mobility of Twin Boundaries in Fe-Pd-Based Ferromagnetic Shape Memory Alloys

Mobility of Twin Boundaries in Fe-Pd-Based Ferromagnetic Shape Memory Alloys

Study of the transitory formation of α 1 bainite, as a precursor of α-phase in tempered SMAs

Diffusive Phenomena and the Austenite/Martensite Relative Stability in Cu-Based Shape-Memory Alloys

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