ÖN ISITMA SICAKLIĞININ Ni3Al/NiAl/NiTi BİLEŞİKLERİNDEN OLUŞAN FONKSİYONEL DERECELENDİRİLMİŞ MALZEMENİN YAPISINA ETKİSİNİN İNCELENMESİ INVESTIGATION OF PREHEAT TEMPRATURE EFFECT ON THE STURCTURE OF FUNCTIONALLY GRADED Ni3Al/NiAl/NiTi INTERMETALLIC COMPOUND

Bu calismada, Ni3Al/NiAl/NiTi bilesiklerinden olusan fonksiyonel derecelenmis malzeme(FDM) kendi kendine ilerleyen yuksek sicaklik sentezlemesi (KKIYSS) teknigi ile uretilmistir. Bu uc farkli bilesigi olusturacak tozlar hassas bir sekilde tartildiktan sonra mekanik olarak karistirilmis ve 200 MPa basincla preslenmistir. Preslenen numuneler, 200, 300 ve 400 °C on isitma sicakliklarinda yuksek voltajli tutusturma yontemi (YVTY) ile argon gazi atmosferinde ateslenerek uretimi gerceklestirilmistir. Uretilen bu fonksiyonel derecelenmis malzemelerin mikroyapilari optik mikroskop, Taramali Elektron Mikroskobu (SEM) ve X-Isinlari Kirinim Cihazi (XRD) ile incelenmis. Sonuc olarak, KKIYSS yontemi ile her uc on isitma sicakliginda da fonksiyonel derecelenmis malzeme basariyla uretilmis ve istenen metaller arasi bilesikler elde edilmis ancak arakesitlerde daha fazla ergime ve bosluk ile birlikte ana fazlar disinda fazlarin da olustugu gorulmustur. In this study, a functional graded material (FGM) consisted of NiTi NiAl and Ni3Al were manufactured by self-propagating high-temperature synthesis (SHS) technique. These three different compound powders were mixed in a rotating container after accurately weighed and cold compacted under 200 MPa pressure. These pressed samples were produced for 200, 300 and 400 ° C preheating temperature by igniting with high voltage under argon gas atmosphere. The microstructures of these functional graded materials were examined by microscopy, Scanning Electron Microscopy (SEM) and X-Ray Diffraction (XRD). Consequently, functional graded material successful generated by SHS in every three preheating temperature and the metallic desired compounds were obtained but, it was seen that apart from the main phases in the intersection there are other phases with more melting and gaps. Anahtar kelimeler: FDM, KKIYSS, NiTi, NiAl, On isitma sicakligi