NiTi ŞBA Tozlarında B2-R-B19' Fazlarına Sıcaklık ve Deformasyonun Etkilerinin İncelenmesi

Year 2018, , 570 - 580, 30.09.2018

Sinan Aksöz , Gülizar Altınışık Ekrem Emre Elverişli , Bülent Bostan

https://doi.org/10.29109/gujsc.387674

Cited By: 2

Abstract

Çalışmada,
önalaşımlı NiTi şekil bellekli alaşım (ŞBA) tozlarına oda sıcaklığında (25°C),
100°C’de ve 200°C’de, farklı deformasyon oranlarına (800MPa, 1300MPa, 1600MPa,
1800MPa, 2000MPa, 2500MPa) deformasyon uygulanmıştır. Çalışmada uygulanan
deformasyonun etkilerini tespit edebilmek için ise; DSC, XRD analizleri
yapılmış ve optik mikroskop görüntüleri incelenmiştir. 

Oda sıcaklığında
yapılan deformasyon neticesinde yapıda B₂ ↔  R ve R ↔ B19' çift fazlı dönüşümü görülürken,
100°C’de ve 200°C’de yapılan deformasyonlar sonrası yapıda yalnızca B₂ ↔
R dönüşümü görülmüştür. Numunelerin XRD analizleri incelendiğinde ise, ham
tozlarda görülen B₂ (östenit) fazları deformasyon oranına bağlı
olarak pik şiddetleri düşmeye başlamış, en düşük B₂ piki en yüksek
deformasyon oranında tespit edilmiştir. XRD pik şiddetindeki düşüşün nedeni ise
artan deformasyon oranına bağlı olarak, östenit pikinin şiddetinin azalmasına
ve martenzit pik şiddetlerinin ise oluşmaya başlaması olarak söylenebilir. 

Keywords

NiTi ŞBA, Sıcak Deformasyon, Soğuk Deformasyon

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