Nikel-Titanyum Şekil Bellekli Alaşımların Süperelastik Davranışına Isıl İşlemin Etkisi

Yıl 2017, Cilt: 20 Sayı: 3, 623 - 627, 15.09.2017

Savaş Dilibal

Öz

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

Kaynakça

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