β-Phase thermal degradation in Zr-added Cu–Zn–Al shape memory alloy

Stipcich, Marcelo; Romero, Ricardo

doi:10.1007/s10973-017-6157-z

Cited by 7 publications

(5 citation statements)

References 26 publications

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“…Stipcich. et al have argued that the third element additive increases the thermal stability, brittleness, mechanical elasticity, grain size of the alloy, has high elastic anisotropy or creates an impurity or a second phase at the grain boundary [26]. Alaneme K. et al observed that the third element to be added to Cu-Zn and Cu-Al alloys in copper-based alloys change the transformation temperatures and microstructure [27].…”

Section: Introductionmentioning

confidence: 99%

Effect of Heat Treatment on Some Thermodynamics Analysis, Crystal and Microstructures of Cu-Al-X (X: Nb, Hf) Shape Memory Alloy

Özen Öner,

Ateş,

Mohammed

et al. 2024

Journal of Physical Chemistry and Functional Materials

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Heat treatment is an important technique that can improve the properties of shape memory alloys. In this study the effect of heat treatment at three different temperatures (973 K, 1073 K and 1173 K) on some thermodynamics parameters, crystal structure, and microstructure of Cu_86 Al_12 Nb_2 and Cu_86 Al_12 Hf_2 (mass %) Shape Memory Alloy has been investigated. After heat treatment, the change in the thermal properties of the samples was determined using Differential Scanning calorimetry (DSC). The effect of heat treatment on the crystal and microstructure of the alloy samples were determined at room temperature using X-ray diffraction (XRD), Scanning Electron microscopy (SEM) device. The DSC result showed that in both samples the temperature hysteresis was decreased after heat treatment. Also grain size was decreased by increasing the treatment temperature in both samples. And finally, optical images represented that Hafnium (Hf) is more dissolved in the alloy compared to Niobium (Nb).

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Section: Introductionmentioning

confidence: 99%

Effect of Heat Treatment on Some Thermodynamics Analysis, Crystal and Microstructures of Cu-Al-X (X: Nb, Hf) Shape Memory Alloy

Özen Öner,

Ateş,

Mohammed

et al. 2024

Journal of Physical Chemistry and Functional Materials

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“…Aydoğdu et al added Co element to the CuAl alloy and stated that it showed shape memory properties at high temperatures [13]. Addition of a third element or heat treatment to copper-based alloys improves shape memory effect, ease of fabrication, good thermal conductivity, and grain size [11,12,14].…”

Section: Introductionmentioning

confidence: 99%

Influence of heat treatment on the phase transformation, thermodynamical parameters, crystal microstructure, and of Cu-Al-X (X: Cr, Ti) shape memory alloys

ATEŞ

Öner

Kanca

2022

Journal of Physical Chemistry and Functional Materials

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Shape memory alloys are known for their ability to return to their original shape under the influence of external factors (temperature, magnetic field and mechanical stress). Although NiTi-based alloys come to mind first when the shape memory effect is mentioned, CuAl-based alloys are very popular alternatives. The low cost of copper-based alloys is the biggest reason to study. In this study, the heat treatment effects of Cu-Al-X (X: Cr, Ti) (% weight) on some thermodynamic parameters, crystal structure and microstructure of shape memory alloy were investigated at three different temperatures (973 K, 1073 K and 1173 K). The changes in the thermal transformation of the samples were determined by DSC (Differential Scanning Calorimetry) and the changes in the crystal structure were determined by X-ray diffraction (XRD), Scanning Electron Microscope (SEM) and optical microscope device. According to DSC measurement, the temperature hysteresis of the samples decreased after the heat treatment. Besides, as the entropy change decreased, the thermal stability of the samples increased. It can be seen that the particle size of the CuAlCr alloy decreased with increasing temperature. The particle size of the CuAlTi alloy increased with increasing temperature. SEM and optical images showed that chromium (Cr) was more dissolved in the alloy compared to titanium (Ti) into CuAl alloy.

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“…Liner izotermal oksidasyon sabiti hesaplamak için n=1 alınır, parabolik izotermal oksidasyon sabitini hesaplamak için n=2 alınır. (ΔW/A) 2…”

Section: Introductionunclassified

“…Bakır bazlı alaşımlar NiTi alaşımları gibi mükemmel bir şekil hatırlama özelliğine sahip olmasa da, Fe bazlı şekil hatırlamalı alaşımlardan üstündür ve ucuz üretim maliyeti ve kolay üretime sahiptir. Buna ek olarak, Cu bazlı şekil hatırlamalı alaşımlar, geniş dönüşüm sıcaklık aralığı, geniş superelastik etki ve dar histerisiz ile NiTi alaşımları yerine kullanılabilecek alaşımlardır [1][2][3][4].…”

Section: Introductionunclassified

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CuAl bazlı şekil hatırlamalı alaşımlarda sıcaklığa bağlı oluşan oksitlenme özelliklerinin incelenmesi

Kök¹,

Ata²,

Yakıncı³

2018

Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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Bu çalışmada, şekil hatırlamalı alaşım grubu içinden, üretimi ucuz ve endüstride kullanılabilirliği olan CuAl ve ve Cu 86 Al 12-X 2 (% kütlece oranda) (X=Cr, Nb, Ti, Hf) şekil hatırlamalı polikristal alaşımlar oksitlenme özellikleri üzerine bir çalışma yapılmıştır. Bu alaşımların geliştirilmesi için yüksek sıcaklıkta en çok 900 o C de ısıl işlem yaptığı bilinmektedir. Bu nedenle çok sık kullanılan bu sıcaklık değerinde, alaşımların sıcaklıkla oksitlenme özelliğini bakılması önemlidir. Alaşımların hepsine TG/DTA (termogravimetrik analiz) cihazı ile oksitlenme işlemi yapılmış ve oksidasyon sabiti değerleri hesaplanmıştır. Oksidasyon sabiti en yüksek olan alaşımın Cu 86 Al 12 Hf 2 alaşımı, en düşük olan alaşımın Cu 86 Al 12 Nb 2 alaşımı olduğu tespit edildi. Ayrıca SEM-EDX ile yapılan yüzey morfoloji incelemelerinde, Cu 88 Al 12 ve Cu 86 Al 12 Ti 2 alaşımları dışında diğer alaşımlarda kabuk şeklinde oksit tabaka görülürken, Cu 88 Al 12 ve Cu 86 Al 12 Ti 2 alaşımlarında topak şeklinde oksit bölgelere rastlanmıştır. Bütün alaşımlarda oksit tabakalarının olduğu x ışınları analizi sonucu da tespit edilmiştir.

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β-Phase thermal degradation in Zr-added Cu–Zn–Al shape memory alloy

Cited by 7 publications

References 26 publications

Effect of Heat Treatment on Some Thermodynamics Analysis, Crystal and Microstructures of Cu-Al-X (X: Nb, Hf) Shape Memory Alloy

Effect of Heat Treatment on Some Thermodynamics Analysis, Crystal and Microstructures of Cu-Al-X (X: Nb, Hf) Shape Memory Alloy

Influence of heat treatment on the phase transformation, thermodynamical parameters, crystal microstructure, and of Cu-Al-X (X: Cr, Ti) shape memory alloys

CuAl bazlı şekil hatırlamalı alaşımlarda sıcaklığa bağlı oluşan oksitlenme özelliklerinin incelenmesi

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