Shape memory effect in a Cu–Zn–Al alloy with dual phase α/β microstructure

Longauer, S.; Makroczy, P.; Janak, G.; Longauerová, Margita

doi:10.1016/s0921-5093(99)00309-3

Cited by 11 publications

(7 citation statements)

References 5 publications

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“…-stacking fault energy decreases with increasing quenching temperature [2] -and volume fraction of martensite during the martensitic transformation in shape memory alloys is function of actual temperature of transformation From this assumptions is obvious, that sample quenched from higher temperature from dual phase region reaches adequate difference in chemical composition earlier, that is at higher temperature than sample quenched from lower temperature, and thus the temperature of starting of martensitic transformation is higher. Equilibrium of stacking fault energy and energy needed for twinning shifts towards lower temperatures with raising quenching temperature.…”

Section: Methodsmentioning

confidence: 99%

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Study Of Decomposition Of Thermoelastic And Non-thermoelastic Martensite In Cu-Zn-Al Alloys

Vojtko

Longauer

2009

ESOMAT 2009 - 8th European Symposium on Martensitic Transformations

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Abstract. Cu based alloys are considerable traditional material with good shape memory effect. Reversal thermoelastic transformation from parent phase to martensite is necessary requirement for taking place of shape memory effect. The significant phase for taking place shape memory effect in CuZnAl alloy is ordered β phase with ideal ratio of valence electrons to atom e/a = 1.48. The alloys with ratio e/a lesser than 1.42 after quenching from single phase beta region undergo non-thermoelastic martensitic transformation and thereby don't possess shape memory effect. This can be obtained by quenching from dual phase α + β region in some alloys. The paper deals with comparison of decomposition at elevated temperatures of thermoelastic and non-thermoelastic martensite to more stable products. Influence of stabilization of martensite on decomposition at elevated temperatures is also studied. Depending up initial state of material and condition of decomposition it could be possible to obtain structure containing α and β or γ phase with miscellaneous morphology and it could be possible to used for modification of definitive structure or for modification of structure before another heat treatment. Study of differences between thermoelastic and non-thermoelastic martensities would be useful for intensification of shape memory properties of Cu based alloys.

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Section: Methodsmentioning

confidence: 99%

“…The factors influenced on amount of shape memory effect in alloy B were described early [2]. Authors explained influence of degree of order, stacking fault energy and volume fraction of α phase on one way and two way shape memory effect.…”

Section: Methodsmentioning

confidence: 99%

Study Of Decomposition Of Thermoelastic And Non-thermoelastic Martensite In Cu-Zn-Al Alloys

Vojtko

Longauer

2009

ESOMAT 2009 - 8th European Symposium on Martensitic Transformations

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“…Some models were found in to order to explain this effect. According to [3] that degradation is caused by decreasing of degree of order and stack fault energy in the martensite with increased quenching temperature from dual phase α + β region.…”

Section: Introductionmentioning

confidence: 99%

Use of Decomposition of Non-Thermoelastic Martensite for Structural Changes of CuZnAl Shape Memory Alloys

Vojtko

Zubko

Ďurišin

2014

MSF

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Cu22Zn4.6Al shape memory alloy shows memory phenomenon after quenching from dual phase region. Amount of shape memory effect continuously decreases with raised quenching temperature. Decrease is caused by increasing of amount of non-thermoelastic martensite in structure [. Approximately above 700°C there is no effect and martensite is non-thermoleastic. Non-thermoelastic martesite decomposes to alpha and gamma/beta phases at heating at elevated temperatures.[ This effect can be used for modification of structure and thus mechanical and shape memory properties. Some various types of structures were obtained and mechanical and shape memory properties were evaluated. Using of decomposition of non-thermoelastic martensite allows to obtain fine structure with the same amount of alpha phase and martensite as in basic state. This type of structure has better shape memory properties and higher mechanical properties.

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“…They also exhibit good resistance to corrosion [1][2][3]. The aluminium bronzes (Cu-Al) present good strength and are also corrosion resistant.…”

Section: Introductionmentioning

confidence: 99%

Corrosion behaviour of Cu-based shape memory alloys, diffusion bonded

Salazar

Soria

Barrena

2005

Journal of Alloys and Compounds

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Shape memory effect in a Cu–Zn–Al alloy with dual phase α/β microstructure

Cited by 11 publications

References 5 publications

Study Of Decomposition Of Thermoelastic And Non-thermoelastic Martensite In Cu-Zn-Al Alloys

Study Of Decomposition Of Thermoelastic And Non-thermoelastic Martensite In Cu-Zn-Al Alloys

Use of Decomposition of Non-Thermoelastic Martensite for Structural Changes of CuZnAl Shape Memory Alloys

Corrosion behaviour of Cu-based shape memory alloys, diffusion bonded

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