Effect of Multi-Directional Hot Forging on Mechanical and Tribological Properties of Al-7Si-4Zn-3Cu Alloy

Yıl 2021, Cilt: 36 Sayı: 1, 255 - 266, 01.12.2020

Yasin Alemdağ Sadun Karabıyık Gençağa Pürçek

https://doi.org/10.17341/gazimmfd.523117

Öz

In this study, mechanical and tribological
properties of multi-directional hot forged Al-7Si-4Zn-3Cu alloy at different
cycles were investigated.  Multi-directional
hot forging resulted in both breaking up the silicon particles and the elimination
of dendritic structure of the alloy. This process increased the yield and
tensile strength with percentage elongation of the alloy but decreased its hardness.
The highest yield and tensile strength were obtained from the alloy forged two
cycles, while the alloy forged three cycles showed a lowest hardness but the highest
percentage elongation.  On the other
hand, hot forged alloy exhibited higher friction coefficient and lower wear
resistance than those of its homogenized state. After the wear test, smeared
and delaminated friction layers were observed on the worn surface of the alloy
in all test conditions. However, smearing was determined to be the main operative
wear mechanism for alloy in both homogenised and hot forged states.

Anahtar Kelimeler

Al-Si alloys, multi-directional forging, friction and wear

Çok yönlü sıcak dövme işleminin Al-7Si-4Zn-3Cu alaşımının mekanik ve tribolojik özelliklerine etkisi

Öz

Bu çalışmada farklı çevrim sayılarında çok yönlü sıcak dövme işlemine
tabi tutulmuş Al-7Si-4Zn-3Cu alaşımının mekanik ve tribolojik özellikleri incelenmiştir.
Çok yönlü sıcak dövme işlemi alaşımın içyapısında bulunun silisyum parçalanmasına
ve dendritik yapının ortadan kalkmasına yol açmıştır. Bu işlem Al-7Si-4Zn-3Cu
alaşımının akma ve çekme dayanımı ile kopma uzaması değerlerini artırmış,
sertliğini ise düşürmüştür. En yüksek akma ve çekme dayanımı iki çevrim dövme
uygulanmış alaşımdan, en düşük sertlik ve en yüksek kopma uzaması üç evrim
uygulanmış alaşımdan elde edilmiştir. Diğer taraftan çok yönlü sıcak dövülmüş
alaşım homojenize edilmiş durumuna göre daha yüksek sürtünme katsayısı ve daha
düşük aşınma direnci sergilemiştir. Aşınma deneyi sonucunda alaşımların yüzeylerinde
sıvanmış tabakaların oluştuğu ve soyulmaların meydana geldiği görülmüştür. Ancak
sıvanmanın gerek homojenize edilmiş gerekse dövülmüş durumdaki numunelerde etken
aşınma mekanizması olduğu belirlenmiştir.

Anahtar Kelimeler

Al-Si alaşımları, çok yönlü dövme, Sürtünme ve Aşınma

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