TiNb-esaslı β-Ti Alaşımlarının Kristal Yapı, Mikroyapı ve Dönüşüm Sıcaklıklarına Tantal Katkısının Etkileri

Yıl 2020, Cilt: 9 Sayı: 4, 1545 - 1553, 25.12.2020

Ercan Ercan Fethi Dağdelen

https://doi.org/10.17798/bitlisfen.775976

Cited By: 1

Öz

β-tipi Ti-esaslı alaşımlar yüksek sıcaklıktaki dayanıklılığı ve biyo-uyumluluğu sayesinde uzay sanayisi ve medikal alanlarda kullanımı yaygın olan materyallerdir. Nb ve Ta gibi düşük yoğunluklu, üstün korozyon direnci ve toksik olmayan özelliklere sahip elementler ile takviye edilmesi, β-tipi Ti-esaslı alaşımları daha da çekici hale getirmiştir. TiNb(24,5-x)Ta(x=0,1,2,3,4) (at. %) oranlarında hazırlanan alaşımların X-ışını, mikroyapı ve dönüşüm sıcaklıkları incelendi. DSC analizlerinden 5,5 oC to 41,1 oC aralığında sadece α→β ters dönüşümü gözlenmiştir. Oda sıcaklığında yapılan XRD analizleri ile DSC sonuçlarının uyumlu olduğu görülmüştür. Baskın β fazlarına karşın α fazlarının küçük miktarlar da olduğu tespit edilmiştir. β fazının baskın olması Ta ve Nb elementlerinin iyi bir β stabilizatörü olduğunu göstermiştir. Optik mikroskop görüntülerinden alaşımlardaki β fazı, taneler ve tane sınırlarının artan Ta ilavesiyle belirginleşmiştir. SEM-EDX görüntülerinden α fazının çökelti olduğu görülmüştür. Ayrıca EDX sonuçları ile Ta element konsatrasyonunun tane sınırlarında arttığı bulunmuştur. Alaşımların (ev⁄a) ve (cv ) oranları oda sıcaklığı altında dönüşüm sergileyen düşük değerli (ev⁄a <5, cv ~ 0,15) yeni alaşımlar olduğu tespit edilmiştir.

Anahtar Kelimeler

β-tipi Ti, kristal yapı, mikroyapı, ters dönüşümlü martensit

Destekleyen Kurum

Fırat Üniversitesi, Bitlis Eren Üniversitesi

Proje Numarası

FF.18.30, FF.19.06, 2014.3

The Effects of Tantalum Additive on the Crystal Structure, Microstructure and Transformation Temperatures of TiNb-based β-Ti Alloys

Öz

β-type Ti-based alloys are materials which widely used in the aerospace industry and medical fields because it has a sufficient biocompatibility and high temperature resistance. Reinforcement with low-density, high corrosion resistance and non-toxic elements, such as Nb and Ta alloying with β-type of Ti-based alloys even more attractive. X-ray, microstructure, and transformation temperatures of TiNb(24,5-x)Ta(x = 0,1,2,3,4) (at. %) alloys were investigated. The DSC analysis showed only α→β reverse transformation for the temperature range of 5,5 oC to 41,1 oC. DSC results were found to be compatible with X-ray analysis taken at room temperature. It was found that α phases were in small amounts despite dominant β phases. The dominance of the β phase has shown that the Ta and Nb elements are a good β stabilizer. It was determined from the optical microscope images that the β phase, grains, and grain boundaries in alloys increased with the addition of Ta. From SEM-EDX results, it was found that α phase is a precipitation. Additionally, the EDX results showed that Ta elements concentration increased in the grain boundaries. Valance electron concentration (ev⁄a) and concentration of valance electron (cv ) values indicated that the alloy with low values of (ev⁄a <5, cv ~ 0,15) exhibit transformation under room temperature.

Anahtar Kelimeler

β-type Ti, crystal structure, microstructure, reverse martensite

Proje Numarası

FF.18.30, FF.19.06, 2014.3

Kaynakça

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