Cu-Sn Alaşımında Gözlenen Martensitik Dönüşümün Kristalografik Analizi

Yıl 2025, Cilt: 25 Sayı: 2, 279 - 286

Hüseyin Arslan

Öz

%14,5 oranında Cu bileşimlerine sahip olan Cu-Sn külçesi. yüksek saflıkta (en az %99,9) ark eritme yoluyla hazırlandı. Külçe, β-fazını elde etmek için Argon atmosferinde 1050 °C'de 50 saat boyunca tavlandı. Martensit faz değişimi, ostenit numunenin sıvı nitrojen içerisinde soğutulmasından sonra gerçekleşti. Bu çalışmada sonsuz küçük deformasyon yaklaşımının katı versiyonunu kullanarak, habit düzlemi normali, kafes değişmez kesme miktarı, toplam şekil deformitesinin büyüklüğü, ostenit ve martensit fazı arasındaki yönelim ilişkileri vb. gibi kristalografik yönelimler ile bağlantılı Cu-Sn alaşımı yalnızca ostenit ve son martensit fazlarının kafes yönelimleri bilgisinden tahmin edilmiştir. Östenit ve martenzit fazlarının kafes yönelimleri, bu çalışmada Cu-Sn alaşımı üzerinde yapılan deneysel çalışmalardan ve martensitik dönüşümün gözlenen kristalografik özelliklerinin, yaklaşım kullanılarak hesaplanan değerlerle karşılaştırılması yoluyla belirlenmektedir. Bu alaşım sistemi için hesaplanan ve gözlemlenen sonuçlar arasındaki uyum, diğerleriyle birlikte, bu çalışmada açıklanan metodolojinin bu alaşım sisteminde gözlemlenen kübik fazdan ortorombik faz dönüşümüne uygulanabileceğine dair ikna edici kanıt sağlar.

Anahtar Kelimeler

Martensitik Dönüşümler, Habit Düzlemi, Cu-Sn Alaşımı;, Faz dönüşümlerinin Kristalografisi

Etik Beyan

Etik bir durum söz konusu değildir.

Destekleyen Kurum

Yok

Teşekkür

Yok

Crystallographical Analysis of Martensitic Transformation Observed in Cu-Sn Alloy

Öz

Cu-Sn ingot having compositions of Cu -14.5 % at. Sn was prepared by arc melting high–purity (at least 99.9%). The ingot was annealed in an Argonne atmosphere at 1050 °C for 50 h to obtain the β-phase. The austenitic sample was cooled in liquid nitrogen and the martensite phase transformation occurred.
Using the rigorous version of the infinitesimal deformation approach in the present work, the crystallographical parameters such as habit plane normal, amount of lattice invariant shear, magnitude of the total shape deformation, orientation relationships between the austenite and martensite phase, etc. associated with Cu-Sn alloy have been predicted from a knowledge only of the lattice parameters of the austenite and final martensite phases. The lattice parameters of the austenite and martensite phases are determined from the experimental studies on Cu-Sn alloy in the present study and the crystallographic features of the martensitic transformation are compared with the values calculated using the approach. The agreement between the calculated and the observed results for this alloy system as well as the others is strong evidence for the applicability of the approach presented in this study to the cubic to the orthorhombic phase transformation observed in this alloy system.

Anahtar Kelimeler

Martensitic Transformations, Habit Plane, Cu-Sn Alloy, Crystallography of phase transformations.

Kaynakça

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