CuAlTa Şekil Hafızalı Alaşımında Gadolinyumun Mikro Yapı, Termodinamik, Mekanik Davranış ve Özgül Isı Kapasitesi Üzerindeki Etkisinin Araştırılması

Abstract

CuAlTa şekil hafızalı alaşımlarının Gadolinyum (Gd) ile zenginleştirilmesiyle üretilen alaşımların yüzey morfolojisi, mikro yapısı, faz geçişi ve özgül ısı kapasitesi C_P (T) sıcaklık değişimlerine bağlı olarak incelenmiştir. Bu çalışma, alaşım bileşiminin ve faz davranışının yüksek martensitik faz dönüşüm sıcaklığı (PTT) ile yakından ilişkili olduğunu göstermektedir. Alaşımlara Gd ilavesi kristal boyutunu küçültmekte ve 18R fazını önemli ölçüde azaltmaktadır. Bu ilişki, özelleştirilmiş özelliklere sahip yeni malzemelerin tasarlanmasını mümkün kılmaktadır. EDS analizi, matristeki sınırlı çözünürlüğü sonucu β fazında tantal çökelmesini doğrulayarak martensitik faz dönüşümünü etkili bir şekilde önlemektedir. Bu nedenle alaşımdaki Gd katkısının artırılmasıyla PTT artmıştır. Öte yandan alaşımdaki Gd'nin artırılması martensitik dönüşüm altındaki yüzeyin azalmasına neden olmakta ve bunun sonucunda şekil hatırlama etkisinin kararlılığını azaltarak C_P (T)'nin artmasına neden olmaktadır.

Keywords

• Cu-Al-Ta-Gd
• şekil hatırlamalı alaşımlar
• yüksek sıcaklık faz geçişi
• özgül ısı kapasitesi

Exploring the Impact of Gadolinium on Microstructure, Thermodynamics, Mechanical Behavior, and Specific Heat Capacity in CuAlTa Shape Memory Alloy

Abstract

The surface morphology, microstructure, phase transition and specific heat capacity C_P (T) of the alloys produced by enriching CuAlTa shape memory alloys with Gadolinium (Gd) were examined depending on temperature changes. This study shows that alloy composition and phase behavior are closely related to high martensitic phase transformation temperature (PTT). The addition of Gd to the alloys reduces the crystal size and significantly reduces the 18R phase. This relationship enables the design of new materials with customized properties. EDS analysis confirms the precipitation of tantalum in the β phase, as a result of its limited solubility in the matrix, effectively preventing the martensitic phase transformation. Therefore, the PTT increased by increasing Gd additive in the alloy. On the other hand, increasing Gd in the alloy causes the surface under martensitic transformation to decrease, and as a result, it reduces the stability of the shape recovery effect, causing the C_P (T) to increase.

Keywords

• Cu-Al-Ta-Gd
• shape memory alloy
• high temperature phase transformation
• specific heat capacity

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