The effects of Nb content on the glass forming ability, thermal stability, and hardness properties of Ni-Co-W-B bulk metallic glasses

Öz

In this study, the effects of reducing the amount of W element and adding Nb element in the bulk metallic glass alloy Ni36.3Co25NbxW(23.7-x)B15 (x = 2–10) on the glass forming ability (GFA), thermal stability and microhardness properties of the alloy were investigated. The purpose of adding Nb element to the alloy is to increase the glass forming ability of the alloy and thus increase the potential of using metallic glasses as precursors in the production of metal matrix composite materials with high toughness and high hardness. It was found that the addition of Nb to the Ni36.3Co25W23.7B15 alloy increased the GFA of the alloy from 0.5 mm to 1 mm and increased the crystallization temperature (Tx) from 909 K to 942 K. However, it was observed that as the amount of Nb added to the alloy increased, the probability of precipitation of the Ni₃(NbW) phase also increased, and although it doubled the GFA of the alloy, it was determined that it also caused it to remain limited to 1 mm. The improved GFA and Tx in Ni-Co-W-B alloys increases the potential of these alloys to be used as precursors for tough and hard composites. Additionally, no major change was observed in the microhardness values of the developed alloys.

Anahtar Kelimeler

• Bulk metallic glasses
• glass forming ability
• thermal properties

Ni-Co-W-B iri hacimli metalik cam alaşımına Nb ilavesinin alaşımın camlaşma kabiliyeti, termal stabilitesi ve sertlik özelliklerine etkisinin incelenmesi

Öz

Bu çalışmada, Ni36.3Co25NbxW(23.7-x)B15 (x = 2–10) iri hacimli metalik cam alaşımındaki W elementi miktarı azaltılarak Nb elementinin eklenmesi ile alaşımın camlaşma kabiliyeti (GFA), termal kararlılığı ve mikrosertlik özellikleri üzerindeki etkileri araştırılmıştır. Alaşıma Nb elementi eklenmesindeki amaç alaşımın camlaşma kabiliyetini arttırarak, yüksek tokluk ve yüksek sertliğe sahip metal matrisli kompozit malzeme üretiminde metalik camların öncül olarak kullanım potansiyelini arttırmaktır. Ni36.3Co25W23.7B15 alaşımına Nb eklenmesi, alaşımın GFA'sını 0,5 mm'den 1 mm'ye çıkarmış ve kristalleşme sıcaklığını (Tx) 909 K'den 942 K'ye çıkardığı tespit edilmiştir. Ancak alaşıma eklenen Nb miktarı artıkça Ni₃(NbW) fazının çökelme olasılığının da arttığı gözlemlenmiş ve hernekadar alaşımın GFA’sını iki katına çıkarsa da 1mm ile sınırlı kalmasına da neden olduğu belirlenmiştir. Ni-Co-W-B alaşımlarındaki iyileştirilmiş GFA ve Tx, bu alaşımların tok ve sert kompozitler için öncül olarak kullanım potansiyellerini artırmaktadır. Ayrıca geliştirilen alaşımların mikrosertlik değerlerinde büyük bir değişim gözlemlenmemiştir.

Anahtar Kelimeler

• İri hacimli metalik camlar
• camlaşma kabiliyeti
• termal özellikler
• metal matrisli kompozitler

Kaynakça

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