Akıllı Malzeme Şekil Hafızalı Alaşımların Termodinamiği

Öz

Akıllı malzemeler, dışarıdan uygulanan etkiler karşısında istenilen tepkileri anlık ve aralıksız bir şekilde yerine getirebilen malzemelerdir. Akıllı malzemelerin bir türü olan Şekil Hafızalı Alaşımlar (ŞHA), uygun ısıl veya mekanik etkilere maruz kaldıklarında önceki şekil ya da boyutuna dönebilme özelliğine sahiptirler. ŞHA’daki şekil değişimi mikro ve makro yapılar arasındaki faz dönüşümü ile ilgilidir. Bu faz dönüşümleri malzemenin yapısında meydana gelen ısı ve enerji değişiminden kaynaklanmakta ve termodinamik yasalara uymaktadır. Şekil hafızalı alaşımların daha iyi anlaşılması için şekil hafıza olayının temelini oluşturan martensitik faz dönüşümünün termodinamiğinin bilinmesi gerekmektedir.

Anahtar Kelimeler

• Şekil hafızalı alaşımlar,Martensitik faz dönüşümü,Termodinamik,Akıllı malzeme

Thermodynamics of Smart Materiel Shape Memory Alloys

Öz

Smart materials can fulfill the desired reactions instantaneously and continuously in response to external applied effects. Shape Memory Alloys (SMA), a type of smart materials, have the ability to return to their previous shapes or sizes when exposed to appropriate thermal or mechanical influences. The shape change of SMA is related to the phase transformation between micro and macro structures. These phase transformations conform thermodynamic laws and are caused by heat and energy changes occurring in the structure of the material. For a better understanding of shape memory alloys, the thermodynamics of the martensitic phase transformation, which is the basis of the shape memory phenomenon, must be known.

Anahtar Kelimeler

• Shape memory alloys,Martensitic phase transformation,Thermodynamics,Smart material

Kaynakça

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