Investigation of Under-Load Wear Behavior and Some Properties of Mg-2Zn Alloy with REE Addition

Öz

Magnesium (Mg) alloys are the lightest of engineering alloys and are increasingly used in fields such as aerospace, automotive, construction materials, and implant applications. In this study, Mg-2Zn magnesium alloy with good strength, formability, and absorption properties was used. To improve the mechanical properties of the cast Mg-2Zn alloy, two different alloys were obtained by adding 0.5% of the popular light Rare Earth Element (REE) La (lanthanum). The effects of La on the alloys were investigated using OM (Metallographic Examination), SEM (Scanning Electron Microscope), hardness, tensile, and wear tests. When the research results were examined, it was found that the addition of the La element to the Mg-2Zn alloy modified the Mg grain structure. Since the La element can dissolve in the Mg alloy, the addition of La weakened the texture. The La element dissolved in the matrix formed non-basal texture components. While the yield strength decreased by 17.62%, the tensile strength increased by 4.13%, and the elongation increased by 61.31%, demonstrating excellent performance. The hardness value increased by 48.53%. Under a 20 N load, the wear value decreased by 41.68% with the addition of La. The results of the study clearly demonstrate the benefit of adding low levels of the rare earth element La to the properties of Mg-2Zn light metal alloys.

Anahtar Kelimeler

• Mg-Zn
• Magnesium
• Casting
• Lanthanum
• Wear

NTE katkılı Mg-2Zn Alaşımının Yük Altında Aşınma Davranışı ve Bazı Özelliklerinin İncelenmesi

Öz

Magnezyum (Mg) alaşımları, mühendislik alaşımlarının en hafifi olarak havacılık, otomotiv, yapı malzemeleri ve implant uygulamaları gibi alanlarda artan kullanım oranına sahiptir. Bu araştırmada iyi mukavemet, şekillendirilebilirlik ve absorpsiyon özelliklere sahip Mg-2Zn magnezyum alaşımı kullanılmıştır. Döküm Mg-2Zn alaşımın mekanik özelliklerini geliştirmek için %0.5 oranında popüler hafif Nadir Toprak Elementi (NTE) La (lantan) eklenerek iki farklı alaşım elde edilmiştir. Alaşımlar üzerinde La’nın etkileri, OM (Metalografik İnceleme), SEM (Taramalı Elektron Mikroskobu), sertlik, çekme ve aşınma testleri ile araştırılmıştır. Araştırma sonuçları incelendiğinde Mg-2Zn alaşımına La elementinin eklenmesiyle Mg tane yapısı modifiye edilmiştir. La elementi Mg alaşımı içerisinde çözünebildiği için, La ilavesi dokuyu zayıflatmıştır. Matriste çözünen La elementi bazal olmayan doku bileşenleri meydana getirmiştir. Akma dayanımı %17.62 düşerken, çekme dayanımı %4.13 artmıştır, % uzama ise %61.31 artarak çok iyi performans sergilemiştir. Sertlik değeri %48.53 artmıştır. 20 N yük altında, La ilavesi ile aşınma değeri %41.68 oranında azalmıştır. Araştırmanın sonuçları Mg-2Zn hafif metal alaşımının özellikleri üzerinde nadir toprak elementi olan La’nın düşük oranlarda ilavesinin faydasını açıkça göstermiştir.

Anahtar Kelimeler

• Mg-Zn
• Magnezyum
• Döküm
• Lantan
• Aşınma

Kaynakça

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