Effect of Age Hardening on the Wear Behaviour of the Al-7Si-4Zn-3Cu Alloy

Year 2019, Volume: 11 Issue: 2, 602 - 611, 30.06.2019

Yasin Alemdağ , Murat Beder

https://doi.org/10.29137/umagd.531910

Abstract

In this study, the friction and wear properties of the Al-7Si-4Zn-3Cu alloy aged T6 and T7 conditions after its solutionizing and quenching treatment were investigated. The results obtained from heat treated alloy were compared to its as-cast state. The friction coefficient of the alloy increased but its volume loss decreased after the T6 and T7 heat treatments. It was especially observed that the alloy aged T6 and T7 conditions exhibited higher wear resistance than its as-cast state at high load and sliding speed. On the other hand, T6 heat treatment was determined to be more powerful effect than the T7 to improve the wear resistance of the alloy. The results obtained were explained in terms of the hardness and strength of the alloy with its wear mechanism at both heat treated and as-cast states.

Keywords

Al-Si alloys, microstructure, quench aging, mechanical properties, friction and wear

Çözündürme ve Yaşlandırma İşleminin Al-7Si-4Zn-3Cu Alaşımının Sürtünme ve Aşınma Özelliklerine Etkisi

Abstract

Bu çalışmada, çözündürme ve su verme işleminden sonra T6 ve T7 koşullarında yaşlandırma işlemine tabi tutulan Al-7Si-4Zn3Cu alaşımının sürtünme ve aşınma özellikleri incelenmiştir. Elde edilen sonuçlar söz konusu alaşımın dökülmüş durumu ile karşılaştırılmıştır. Bu işlemlerden sonra alaşımın sürtünme katsayısının artığı ancak aşınma kaybının azaldığı gözlenmiştir. Özellikle T6 ve T7 ısıl işlemleri uygulanmış alaşımın yüksek yük ve kayma hızlarında dökülmüş durumuna göre oldukça üstün aşınma direnci sergilediği görülmüştür. Diğer taraftan T6 ısıl işleminin T7 ısıl işlemine göre alaşımın aşınma direnci üzerinde daha etkili olduğu belirlenmiştir. Elde edilen bu sonuçlar hem dökülmüş hem de ısıl işlem görmüş durumdaki alaşımın sertlik
ve mukavemetleri ile bu alaşımda ortaya çıkan aşınma mekanizmalarına dayandırılarak açıklanmıştır. 

Keywords

Al-Si alaşımları, mikro yapı, yaşlandırma, sürtünme ve aşınma

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