Çok Fazlı CoCuFeNiNb Yüksek Entropili Alaşımın Tribolojik ve Elektrokimyasal Özelliklerinin Değerlendirilmesi

Yıl 2024, Cilt: 14 Sayı: 1, 176 - 190, 30.06.2024

Sefa Emre Sünbül , Kürşat İcin

https://doi.org/10.54370/ordubtd.1495311

Öz

Yüksek entropili alaşımlar (YEA'lar), son yıllarda yoğun araştırmalara konu olmuş ve farklı endüstriyel uygulamalara yönelik potansiyel göstermektedir. Bu çalışma, CoCuFeNiNb alaşımının yapısal, tribolojik ve elektrokimyasal özelliklerini incelemektedir. Alaşım, Ar atmosferinde vakumlu ark eritme yöntemi ile hazırlanmış ve XRD, SEM, EDX, aşınma ve korozyon analizleri ile karakterize edilmiştir. Aşınma testleri ve korozyon deneyleri, alaşımın tribolojik ve elektrokimyasal performansını değerlendirmiştir. Bulgular, alaşımın YMK, HMK ve Laves fazlarından oluştuğunu göstermektedir. CoCuFeNiNb yüksek entropili alaşımının sürtünme katsayısı, 0.25 MPa, 0.5 MPa ve 1 MPa yük altında sırasıyla 0.28, 0.5 ve 0.78 olarak artış göstermiştir. Aşınma yüzeyinde düşük basınçta abrazyon izleri, orta basınçta delaminasyon tabakaları ve yüksek basınçta plastik deformasyon bölgeleri gözlemlenmiştir. CoCuFeNiNb alaşımının %3,5 NaCl çözeltisindeki korozyon potansiyeli -0,236 V ve korozyon akım yoğunluğu 1,89×10⁻⁵ A/cm² olarak belirlenmiştir.

Anahtar Kelimeler

yüksek entropili alaşım, vakum ark ergime, tribolojik özellikler, korozyon özellikleri

Proje Numarası

FAY-2023-10562 and FBA-2024-11177

Evaluation of Tribological and Electrochemical Properties of Multiphase CoCuFeNiNb High Entropy Alloy

Öz

Recent research has heavily focused on high entropy alloys (HEAs) due to their promising potential for diverse industrial applications. This study investigates the CoCuFeNiNb alloy, analyzing its structural, tribological, and electrochemical characteristics. The alloy was synthesized using vacuum arc melting in an argon environment and was subsequently examined through X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), wear testing, and corrosion analysis. The tribological and electrochemical performances were assessed through wear and corrosion experiments. The results reveal that the alloy contains FCC, BCC, and Laves phases. The coefficient of friction for the CoCuFeNiNb high entropy alloy increased to 0.28, 0.5, and 0.78 under loads of 0.25 MPa, 0.5 MPa, and 1 MPa, respectively. Observations of the wear surface showed abrasion wear at low pressure, delamination layers at medium pressure, and plastic deformation zones at high pressure. In a 3.5 wt% NaCl solution, the alloy exhibited a corrosion potential of -0.236 V and a corrosion current density of 1.89×10⁻⁵ A/cm².

Anahtar Kelimeler

high entropy alloy, vacuum arc melting, tribological properties, corrosion properties

Etik Beyan

There are no ethical problems regarding the publication of this paper.

Destekleyen Kurum

Karadeniz Teknik Üniversitesi

Proje Numarası

FAY-2023-10562 and FBA-2024-11177

Teşekkür

Current study was supported by Karadeniz Technical University Scientific Research Projects Unit with the projects numbered FAY-2023-10562 and FBA-2024-11177. The authors would like to thank the relevant unit for their support.

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