AA7075 Yaşlandırılmasında Farklı Ön Gerinmelerin Mekanik Özelliklere Etkilerinin İncelenmesi

Year 2019, Volume: 31 - Özel Sayı I:, 23 - 32, 20.05.2019

Süleyman Kılıç , İlyas Kacar Fahrettin Öztürk , Mevlüt Şahin , Oğuz Erdem

https://doi.org/10.7240/jeps.457267

Cited By: 1

Abstract

Bu çalışmada havacılık sanayinde yaygın kullanıma sahip
7075 alüminyum alaşımının yaşlandırılmasında farklı ön gerinmelerin alaşımın mekanik
özelliklerine etkileri incelenmiştir. Çalışmadaki temel amaç farklı oranlarda
şekillendirilmiş parçaların boya fırınlaması esnasındaki mekanik ve mikroyapı
özelliklerinin değişiminin belirlenmesidir. Boya fırınlama işlemlerinde
genellikle 120-200 ºC sıcaklıkları kullanılmaktadır. Bu kapsamda çalışmamızda yaşlandırma
sıcaklıkları 120, 160 ve 200 ºC olarak seçilmiştir. Numunelere farklı ön gerinmeler
uygulanarak ön gerinmenin yaşlandırmadaki etkisi detaylı olarak incelenmiştir. İncelemeler
sonucunda ön gerinmenin artmasıyla, 200 ºC yaşlandırma sıcaklığında akma
mukavemeti ve geri esneme düşerken, altındaki yaşlandırma sıcaklıklarında artmaktadır.
Bunun sebebi ise mikroyapıdaki MgZn₂ katı çökeltilerinin hacimsel
miktarıdır.

Keywords

Ön gerinme, MgZn2 katı çökeltileri, AA 7075, mekanik özellikler, XRD

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