Sıcak daldırma alüminyumlama (SDA) ve difüzyon tavlaması ile yüzeyi modifiye edilmiş Ti-6Al-4V alaşımının karakterizasyonu

Yıl 2023, Cilt: 38 Sayı: 1, 309 - 318, 21.06.2022

Yakup Yürektürk

https://doi.org/10.17341/gazimmfd.1009881

Öz

Bu çalışmada, Ti6Al4V alaşımı önce sıcak daldırma alüminyumlama (SDA) işlemine ardından difüzyon tavlamasına tabi tutulmuştur. SDA 750ºC'de 3 dk uygulanmış ve bu işlemin uygulanmasıyla yüzeyde en üst tabaka bir Al ile Al3Ti difüzyon tabakasından bir kaplama oluşturulmuştur. Difüzyon tavlaması için sıcak daldırma alüminyumlanmış numuneler ısıtma hızı <12°C/s olan bir rezistans fırınında 1000°C'ye yükselecek şekilde ayarlanmış ve bu sıcaklıkta 1 saat tutulmuştur. Difüzyon tavlamasından sonra yeni bir formda Al3Ti ve oksit fazlarından (Al2TiO5, Al2O3) oluşan bir kompozit tabaka oluşmuştur. Numunelerin yapısal, mekaniksel ve aşınma özellikleri SEM-EDS, XRD, sertlik ve kuru ortam “ball-on disc ” konfigürasyonunda tribometre testleri kullanılarak karakterize edilmiştir. Ti-6Al-4V alaşımı üzerine uygulanan SDA ve difüzyon tavlaması ile sertlik sadece SDA uygulanmış numuneye kıyasla ~11 kat ve başlangıç haline kıyasla ~1,4 kat yükselmiştir. Aşınma testi sonuçlarına göre, numuneler arasında en iyi aşınma direncini SDA ve ardından difüzyon tavlaması uygulanmış numune göstermiştir.

Anahtar Kelimeler

Sıcak daldırma alüminyumlama, Ti-6Al-4V, Difüzyon tavlaması, Alüminid kaplama, Aşınma

Kaynakça

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