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Journals / Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi / 2018 / Cilt: 20 Sayı: 2

Investigation of the oxidation properties of CuAl-based shape memory alloys depending on the temperature

CuAl bazlı şekil hatırlamalı alaşımlarda sıcaklığa bağlı oluşan oksitlenme özelliklerinin incelenmesi

Mediha Kök
Şahin Ata
Zehra Deniz Yakıncı
Pages
157–163
Publication Date
2018-12-01
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

In all alloys, the x-ray analysis results of the oxide layers are also found.

📌 3 Key Takeaways

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Objective & Hypothesis:In this study, the oxidation properties of CuAl and Cu 86 Al1 2 -X 2 (X = Cr, Nb, Ti, Hf) shape memory polycrystalline alloys, which are inexpensive and industrially usable, were studied from the shape memory alloy group.
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Key Findings & Data:It is known that these alloys are heat treated at high temperatures up to 900 o C for the development of these alloys.
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Conclusion & Impact:In all alloys, the x-ray analysis results of the oxide layers are also found.
🔬Design:Araştırma Makalesi
📍Scope:Comprehensive Sample
⚙️Variables:Bakır bazlı · şekil hatırlamalı alaşım · oksidasyon

Abstract

In this study, the oxidation properties of CuAl and Cu 86 Al1 2 -X 2 (X = Cr, Nb, Ti, Hf) shape memory polycrystalline alloys, which are inexpensive and industrially usable, were studied from the shape memory alloy group. It is known that these alloys are heat treated at high temperatures up to 900 o C for the development of these alloys. For this reason, it is important to examine the oxidation properties of alloys with temperature at this frequently used temperature value. Alloys were oxidized with TG/DTA (thermogravimetric analysis) device and oxidation constant values were calculated. The alloy Cu 86 Al 12 Hf 2 with the highest oxidation constant was found to be the lowest alloy Cu 86 Al 12 Nb 2 alloy. In the surface morphology studies made with SEM-EDX, except for Cu 88 Al 12 and Cu 86 Al 12 Ti 2 alloys, coat-like oxide layers were observed in other alloys, whereas Cu 88 Al 12 and Cu 86 Al 12 Ti 2 alloys were found to have oxide cluster regions. In all alloys, the x-ray analysis results of the oxide layers are also found.

Özet

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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Cite This Article

Kök, M., Ata, Ş., Yakıncı, Z. D. (2018). Investigation of the oxidation properties of CuAl-based shape memory alloys depending on the temperature. Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi, Cilt: 20 Sayı: 2, 157–163. https://doi.org/10.25092/baunfbed.423275

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