AA7075 Yaşlandırılmasında Farklı Ön Gerinmelerin Mekanik Özelliklere Etkilerinin İncelenmesi

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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