DÖKÜM VE HADDELENMİŞ AZ31B MAGNEZYUM ALAŞIMININ KURU ŞARTLARDA AŞINMA DAVRANIŞININ KIYASLANMASI

Aşınma direnci literatürde yeterli bilgi olmaması sebebiyle magnezyum alaşımlarının uygulama alanlarını kısıtlayabilecek önemli teknik özelliklerden biridir. Bu çalışmada pin-on disk yöntemi kullanılarak kuru çalışma şartlarında döküm ve haddelenmiş AZ31B magnezyum alaşımlarının aşınma davranışı incelenmiştir. Aşınma hızı 1500 m sabit kayma mesafesi, 0,25-0,50-1,00 ve 2,00 m/s kayma hızı ve 10-20-40 ve 80 N gibi farklı yüklerde ölçülmüştür. Aşınmış yüzeylerin yüzey morfolojisi SEM cihazı kullanılarak incelenmiştir. Haddelenmiş alaşım ince mikroyapı ve daha yüksek sertlik özelliklerinden dolayı döküm alaşımdan daha iyi aşınma direnci sergilemiştir. Aşınma haritalarına göre sonuçlar en büyük yük ve en yüksek kayma hızında aşırı plastik deformasyonun ana aşınma mekanizması olduğunu göstermiştir.

Anahtar Kelimeler:

Kuru aşınma, AZ31B döküm/hadde magnezyum alaşımı, aşınma mekanizmaları, aşınma haritası

A COMPARISON OF THE DRY SLIDING WEAR BEHAVIOR OF AS-CAST AND HOT ROLLED AZ31B MAGNESIUM ALLOY

Wear resistance is one of the important technological properties of magnesium alloys that may limit their practical applications, though limited information is available in the literature. In this study, wear behavior of as-cast and hot rolled AZ31B magnesium alloy on dry-sliding conditions was investigated using a pin-on disc method. Wear rate was measured at a fixed sliding distance of 1500 m and at different sliding velocities of 0.25, 0.50, 1.00 and 2.00 m/s, as well as different applied loads of 10, 20, 40 and 80 N. Surface morphology of worn surface of the alloy was analyzed using a SEM/EDS. Hot rolled alloy exhibited a better wear resistance than the as-cast alloy due to a finer microstructure and higher hardness. Results showed that ultra-severe plastic deformation was found to be the main wear mechanism at the highest applied load and sliding velocity for the alloy at both metallurgical conditions according to wear maps.

Keywords:

Dry sliding wear, AZ31B cast/hot rolled magnesium alloy, wear mechanisms, wear map,

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