Yapay Yaşlandırma ve Soğutma Hızının AA6082'nin Mikroyapı ve Mekanik Özelliklerine Etkisi

Abstract

Bu çalışmada 6082 alüminyum alaşımının ısıl işlem sonucunda mikro yapı ve mekanik özelliklerinin değişimi incelenmiştir. Isıl işlem olarak seçilen malzemeler önce 450 °C'de 2 saat tavlandı, böylece artık gerilmeler giderildi ve tane yapısı homojen hale getirildi. Daha sonra tavlanan numuneler 3 farklı ortamda (fırında bekleterek, oda ortamında hava ile ve oda ortamında su ile) soğutuldu ve bu ortamların etkisi incelendi. Ayrıca suni yaşlandırma da uygulanarak numuneler dört farklı koşulda hazırlanmış ve bu dört farklı koşul için sertlik ve basma testleri yapılarak mekanik özellikler incelenmiş ve optik mikroskop yardımıyla mikroyapısal özellikler incelenmiştir. Sonuç olarak, tavlama sonrası soğuma hızının ve yapay yaşlandırmanın malzeme üzerindeki etkileri belirlenmiş ve elde edilen sonuçlar bağlamında mikroyapısal değişimler ile mekanik özellikler arasındaki bağlantılar tartışılmıştır. Soğuma hızına ve suni yaşlandırmaya bağlı olarak her bir durum için farklı tane yapıları ve ikincil faz çökeltileri gözlemlenmiştir. Soğutma hızının artmasıyla mekanik özelliklerde artış gözlemlenmiş ve en yüksek artış da yapay yaşlandırılan malzemede görülmüştür.

Keywords

• Yapay yaşlandırma
• Isıl işlem
• Basma testi
• Sertlik testi
• Optik mikroskop.

Effect of Artificial Aging and Cooling Rate on Microstructure and Mechanical Properties of AA6082

Abstract

In this study, the change of microstructure and mechanical properties of 6082 aluminium alloy as a result of heat treatment was examined. Materials selected as heat treatment are first annealed at 450 °C for 2 hours, so the residual stresses are eliminated and the grain structure is homogenized. Afterwards, the annealed samples were cooled in 3 different environments (by waiting in the oven, by air in the room environment, and in water in the room environment) and the effect of these environments was studied. In addition, by applying artificial aging specimens were prepared under four different conditions, and mechanical properties were examined by performing hardness and compression tests for these four different conditions, and microstructural properties were examined with the help of an optical microscope. As a result, the effects of post-annealing cooling rate and artificial aging on the material were determined and the connection between microstructural changes and mechanical properties was discussed in the context of the results obtained. Depending on the cooling rate and artificial aging, different grain structures and secondary phase precipitates were determined for each case in the microstructure examinations. In connection with this situation, the increase in the mechanical properties was observed with the increase of the cooling rate, and the highest increase was seen in the aged material.

Keywords

• Artificial aging
• Heat treatment
• Compression test
• Hardness test
• Optical microscope.

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