Sıcak Presleme Ve Yüksek Sıcaklık Sinterleme Kombinasyonu İle Β Tipi Biyomedikal Ti74Nb26 Alaşımının Üretimi

Abstract

Ti-Nb alaşımları genellikle döküm yöntemi ile üretilirler. Saf Ti ve Nb’un erime sıcaklıkları oldukça
yüksek olduğundan döküm yoluyla Ti-Nb alaşımlarını üretmek maliyetlidir. Toz metalurjisi yöntemi ile
bu alaşımları çok daha düşük sıcaklıklarda (Ti erime sıcaklığından daha az) ve tamamen katı halde
ekonomik olarak üretmek mümkündür. Bu çalışmada Ti74Nb26 alaşımları saf Ti ve saf Nb tozları
kullanılarak, sıcak presleme ve yüksek sıcaklık sinterlemesinin ilk kez birlikte uygulanması ile
üretilmiştir. Üretim sürecinde uygulanan işlem sıcaklığı ve zamanının yoğunluk, mikroyapı ve mekanik
davranış üzerindeki etkileri araştırılmıştır. Yoğunluk ölçümleri, 800 °C'de yapılan sıcak presleme
işleminin tam yoğunluğu sağladığını göstermiştir. XRD ve SEM incelemeleri, sinterleme süresinin
artmasıyla birlikte β fazı oluşumunun arttığını ortaya koymuştur. Ana faz β'ya ilaveten, mikroyapıda az
miktarda α fazı ve çok az miktarda saf Nb gözlenmiştir. Mekanik özellikler tek eksenli basma ve mikro
Vickers sertlik testleri ile belirlenmiştir. Mekanik test sonuçları, 1200 °C'de 4 saatlik sinterlemenin en
yüksek sertlik (336 HV), elastik modül (44 GPa), akma mukavemeti (894 MPa) ve basma mukavemeti (1178
MPa) değerlerini sağladığını göstermiştir.

Keywords

• Titanyum-Niyobyum alaşımları,Toz metalurjisi,Sıcak presleme,Sinterleme,Mikroyapı,Mekanik özellikler

PROCESSING OF β-TYPE BIOMEDICAL Ti74Nb26 ALLOY BY COMBINATION OF HOT PRESSING AND HIGH TEMPERATURE SINTERING

Abstract

Titanium (Ti)-Niobium (Nb) alloys are generally produced by casting methods. Since the
melting temperatures of pure Ti and Nb are quite high, their fabrication by casting techniques is costly.
On the other hand, it is possible to produce these alloys economically at much lower temperatures (less
than melting temperature of Ti), completely in solid state using powder metallurgy. In the present study,
Ti74Nb26 alloys were produced using pure Ti and pure Nb powders by combination of hot pressing and
high temperature sintering for the first time. The influences of processing temperature and time on
density, microstructure, and mechanical behavior were investigated. Density measurements showed that
hot pressing at 800 °C provided full density. XRD and SEM investigations revealed that amount of β phase
formed increased with increasing sintering time. In addition to main phase β, little amount of α phase and
a very small amount of pure Nb were observed in the microstructure. Mechanical properties were
measured by means of uniaxial compression and micro Vickers indentation tests. The results indicated
that 4 h of sintering at 1200 °C exhibited the highest value of hardness (336 HV), elastic modulus (44 GPa),
yield strength (894 MPa), and compressive strength (1178 MPa).

Keywords

• Titanium-Niobium alloys,Powder metallurgy,Hot pressing,Sintering,Microstructure,Mechanical properties

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