Fatih DEMİR, Musa KILIÇ, Serkan BATI, İbrahim BİLİZ, Ayşenur Aslı CEYHAN

SHS Yöntemiyle Üretilen Cr Takviyeli Katmanlı NiAl-Ni3Al İntermetalik Bileşiğinin Mikroyapı ve Mikrosertlik Özelliklerinin Belirlenmesi

NiAl ve Ni3Al intermetalik bileşikler günümüzde özellikle yüksek sıcaklık uygulamalarında tercih edilenmalzemelerdir. Bu malzemelerin en büyük dezavantajı işleme ve dövme gibi uygulamalar esnasında gevrekkırılma göstermesidir. Bu çalışmada toz metalürjisi yöntemlerinden biri olan kendi ilerleyen yüksek sıcaklıksentezi (self-propagating high temperature synthesis = SHS) ile krom takviyeli iki katmandan oluşan NiAl/Ni3Alintermetalik malzemesi üretilmiştir. Yüksek saflıktaki tozların karıştırılmasıyla elde edilen malzemeye Cr takviyeedilerek malzemenin mikroyapısına ve mikrosertliğine etkileri incelenmiştir. Katmanlı malzemenin mikroyapıanalizleri optik mikroskop ve taramalı elektron mikroskobu (SEM) kullanılarak yapılmıştır. Ayrıca numunelerinkimyasal kompozisyonlarının tespiti için EDX, faz bileşenlerinin tespiti için ise XRD analizleri yapılmıştır.Yapılan analizler sonucunda SHS yöntemi kullanılarak katmanlı ve Cr katkılı NiAl/Ni3Al intermetalikmalzemelerinin üretilebileceği görülmüştür. Ayrıca faz analizleri incelendiğinde NiAl/Ni3Al ana fazlarınınyanında Cr2Ni3 fazı da oluşmuştur. Mikroyapı analizleri Ni3Al bölgesinde ve ara bölgede NiAl bölgesine oranladaha fazla gözenek oluştuğu görülmüştür. Mikrosertlik ölçümlerimde ise en yüksek sertlik Ni3Al bölgesinde düşüksertlik ise NiAl bölgesinde ölçülmüştür.

Microstructural and Microhardness Determination of Cr Doped Layered NiAl-Ni3Al Intermetallic Compound Produced by SHS Method

NiAl and Ni3Al intermetallic compounds are preferred materials especially in high-temperature applications. The major disadvantage of these materials is their brittle fracture during applications such as machining and forging. In this study, Cr doped two-layered NiAl/Ni3Al intermetallic material is produced with one of powder metallurgy process which is named as Self-Propagating High-Temperature Synthesis (SHS). The material obtained by mixing high purity powders was reinforced with Cr and its effects on the microstructure and microhardness of the material were investigated. Microstructural analysis of the layered material was carried out with optical microscopy and scanning electron microscopy (SEM). Also, EDX and XRD analyses were carried out to determine the chemical compositions and phase components of the samples. As a result of the analysis, layered and Cr doped NiAl / Ni3Al intermetallic materials can be produced by the SHS method. In addition, Cr2Ni3 phase was formed in addition to NiAl/Ni3Al main phases. The microstructure analysis showed that in Ni3Al region and intermediate region were formed more pores than NiAl region. In hardness measurements, the highest hardness was measured in Ni3Al region and the lowest hardness was measured in the NiAl region.

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