Nikel-Titanyum Şekil Bellekli Alaşımların Süperelastik Davranışına Isıl İşlemin Etkisi, sayfa: 623-627

Savaş DİLİBAL

Özet


Şekil bellekli alaşımlar (ŞBA), mikroyapıda östenit ve martenzit fazlar arasında tersinir termoelastik faz dönüşümü ile makroyapıda şekil belleği ve süperelastik davranış gösterebilen intermetalik malzemelerdir. Nikel-titanyum (NiTi) ŞBA`lar süperelastik özelliği sebebiyle başta biyomedikal uygulamalar olmak üzere birçok alanda hızla yaygınlaşmaktadır. Bu çalışmada, atomik olarak % 50.8 nikel içeren NiTi numunelere uygulanan ısıl işlemin, alaşımın faz dönüşüm sıcaklığı ve süperelastik davranışına etkisi incelenmiştir. Yapılan diferansiyel taramalı kalorimetri (DSC) analizleri ve çekme testlerinde elde edilen sonuçlar karşılaştırılmıştır. Çözeltiye alma ve  yaşlandırma ısıl işlemlerinin, NiTi numunelerin süperelastik davranış gösterme karakteristiğini artırdığı deneysel sonuçlarla gözlemlenmiştir. 


Anahtar Kelimeler


Şekil bellekli alaşımlar, nikel-titanyum, süperelastik davranış.

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