Effect of copper addition to Etial 180 alloy on microstructure, hardness and corrosion

Abstract

In this study, 0-5 wt.% copper was added to Etial 180 alloy. Microstructural examinations, hardness tests and corrosion resistance of the produced samples were measured. In the study, it was observed that the addition of copper caused significant changes in the microstructure of the Etial 180 alloy. It was observed that the volumetric phase density of Al2Cu in the microstructure increased with increasing copper ratio. As a result of the hardness test, it was determined that the added copper to the Etial 180 alloy caused a linear increase in the hardness of the alloy. In the study, the highest hardness value was measured as 80.2 HB in the alloy containing 5 wt.% copper, and it was determined that it increased the hardness by 22% compared to the reference sample. As a result of the potentiodynamic polarization test performed on the cast samples, it was determined that the increased copper ratio did not cause a significant change in the corrosion potentials, but it was observed that the current density values generally increased with the increasing copper ratio. In the study, the lowest corrosion resistance was measured in the sample containing 5 wt.% copper.

Keywords

• Aluminium
• Alloy
• EtiAl180(LM2)
• Hardness
• Corrosion.

Etial 180 alaşımına ilave edilen bakırın mikroyapı, sertlik ve korozyon üzerindeki etkisi

Öz

Bu çalışmada Etial 180 alaşımı içerisine ağırlıkça %0-5 oranında bakır ilavesi gerçekleştirilmiştir. Üretilen numunelerin mikroyapısal incelemeleri, sertlik değerleri ve korozyon dirençleri ölçülmüştür. Çalışmada bakır ilavesinin Etial 180 alaşımının mikroyapısında önemli değişikliklere neden olduğu gözlemlenmiştir. Artan bakır oranı ile mikroyapıda Al2Cu faz yoğunluğunun arttığı görülmüştür. Sertlik testi sonucu Etial 180 alaşımına ilave bakırın alaşımın sertliğinde doğrusal bir artışa neden olduğu tespit edilmiştir. Çalışmada en yüksek sertlik değeri ağırlıkça %5 bakır içeren alaşımda 80.2 HB olarak ölçülmüş ve referans numuneye göre sertliği %22 oranında artırdığı tespit edilmiştir. Döküm numunelere gerçekleştirilen potansiyodinamik polorizasyon testi sonucu artan bakır oranının korozyon potansiyellerinde önemli bir değişime neden olmadığı tespit edilmiş fakat akım yoğunluğu değerlerinin genel olarak artan bakır oranı ile arttığı görülmüştür. Çalışmada en düşük korozyon direnci %5 bakır içeren numunede ölçülmüştür.

Anahtar Kelimeler

• Aluminyum
• Alaşım
• Etial180(LM2)
• Sertlik
• Korozyon

Kaynakça

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