Cu-Al Baz Alaşımın Termoyapısal Şekil Hafıza Özelliklerinin Üçüncü Cr Elementi İlaveleriyle Değişimi

Abstract

Bu çalışma, farklı oranlarda krom (Cr) katkılamalarının CuAlCr şekil hafızalı alaşımının (ŞHA'nın) şekil hafıza özellikleriyle ilgili faz dönüşüm davranışı, termal kararlılığı ve mikroyapısı üzerindeki etkilerini sunmaktadır. CuAlCr ŞHA'ya iki farklı miktarda Cr katkılamasının etkileri araştırılmıştır. Elde edilen bulgular, bu şekil hafızalı alaşımın termal ve bileşimsel kararlılığında farkedilebilir bir iyileşme olduğunu ortaya koymuştur. Bu iyileşme, elektronik konsantrasyonu (e/a oranı) neredeyse aynı (~1.52) tutarak krom içeriğinin değiştirilmesinin rolüne ve martensitler arasında oluşan krom dendritleri nedeniyle alüminyumun engellenen difüzyonuna ve kısıtlanmış dislokasyon hareketlerine atfedilmiştir. Bu durum, şekil hafıza özelliklerini iyileştirmiş, martensitik faz dönüşüm sıcaklıklarını, entalpi ile entropi değişimini ve elastokalorik etkiyi artırmıştır. Krom içeriğinin at%5.95'ten at%10.24'e çıkarılmasıyla, As sıcaklığında maksimum 54 °C ve Ms sıcaklığında maksimum 25 °C artış olduğu tespit edilmiştir. Ayrıca, 16.04 J/gr gibi bir maksimum entalpi değişim değeri ve buna karşılık gelen 25.78 J/kgK'lik yüksek bir entropi değişim değeri elde edilmiştir. Dahası, ters dönüşüm aktivasyon enerjisinde 416.78 kJ/mol'den 48.97 kJ/mol'e kadar önemli bir düşüş de belirlenmiştir. Bu araştırmanın sonuçları, CuAlCr ŞHA'ların mikroyapısal ve faz dönüşüm dinamiklerinin daha derinlemesine anlaşılmasına katkıda bulunur ve bu malzemelerin yüksek sıcaklık bakır bazlı ŞHA uygulamaları için potansiyelini vurgulamaktadır.

Keywords

• Şekil hafızalı alaşımlar
• CuAlCr ŞHA
• Şekil hafıza etkisi
• Martensitik dönüşüm
• Termal kararlılık

Supporting Institution

Yazarlar, bu araştırmaya Fırat Üniversitesi Bilimsel Araştırma Projeleri Yönetim Birimi'nin ADEP-23.03 proje numarasıyla ve Munzur Üniversitesi Bilimsel Araştırma Projeleri Birimi'nin İHTS2024-01 proje numarasıyla sağladığı desteği bildirmektedir.

Project Number

ADEP-23.03 and İHTS2024-01

Ethical Statement

Makalenin yazarları bu çalışmada herhangi bir çıkar çatışması olmadığını beyan ederler.

Thermostructural Shape Memory Properties of Cu-Al Base Alloy Changing by Third Cr Element Incorporations

Abstract

This study presents the effects of the chromium (Cr) additions on the phase transformation behavior, thermal stability, and microstructure related to the shape memory properties of CuAlCr shape memory alloy (SMA). The influences of two different amount of Cr additions on CuAlCr SMA was investigated. The findings revealed a noticeable enhancement in the thermal and compositional stability of this SMA, attributed to the role of changing the Cr content by keeping the electron concentration (e/a ratio) of the alloy almost same (~1.52) and the role of hindered diffusion of aluminum and restricted dislocation movements due to the Cr dendrites formed between martensites. Which improved the shape memory properties and increased the characteristic transformation temperatures, enthalpy and entropy change of martensitic phase transformation. By increasing the Cr content from 5.95 at% to 10.24 at%; a maximum increase of 54 °C in As temperature and a maximum increase of 25 °C in Ms temperature were found to be occurred. Also, a maximum enthaphy change value of 16.04 J/gr and a related high entropy change value of 25.78 J/kgK were obtained. Moreover, a decrease in the reverse transformation activation energy from 416.78 kJ/mol to 48.97 kJ/mol was determined, too. The results of this research contribute to a deeper understanding of the microstructural and phase transformation dynamics in CuAlCr SMAs and highlight the potential of these materials for high-temperature Cu-based SMA applications.

Keywords

• Shape memory alloys
• CuAlCr SMA
• Shape memory effect
• Martensitic transformation
• Thermal stability

Supporting Institution

The authors acknowledge the support of Firat University Scientific Research Projects Management Unit for this research through the project number ADEP-23.03 and the support of Munzur University Scientific Research Projects Unit for this research through the project number İHTS2024-01.

Project Number

ADEP-23.03 and İHTS2024-01

Ethical Statement

The authors of the manuscript declare that there are no conflicts of interest in this study.

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