Akıllı Malzeme Şekil Hafızalı Alaşımların Termodinamiği

Yıl 2017, Cilt: 6 Sayı: 2, 541 - 555, 30.12.2017

Ömer Çakmak Mehmet Kaya

https://doi.org/10.17100/nevbiltek.311306

Cited By: 5

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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