Characterization of Zr microsegregation in modified AlMgSi1Mn alloy and its effect on microstructure

Öz

In this study, the effect of zirconium segregation occurring during the casting process on the microstructure and recrystallization of the alloy after the modification of an AlMgSi1Mn alloy used in the automotive industry by adding 0.3% Zr by weight was characterized. After the alloys were cast in industrial sizes by the semi-continuous casting method, their microstructures were examined microscopically and the phases formed in the casting were determined. Electron probe microanalysis was performed to examine zirconium segregation in the as-cast alloys. Then, the alloys were homogenized in accordance with industrial conditions. Samples taken from the homogenized alloys were cold deformed and annealed. The effect of zirconium segregation on recrystallization behavior was examined by electron probe microanalysis of these samples. As a result of the analysis, it was found that zirconium segregated towards the aluminum dendrite centers during solidification in the casting, and in the regions where the solubility limit was not exceeded in the interdendritic regions, the deformation structure disappeared in these regions after the subsequent deformation and heat treatments, causing recrystallization.

Anahtar Kelimeler

• AlMgSi1Mn alloy
• Al3Zr precipitate
• "microsegregation
• recrystallization
• transition element

Modifiye edilmiş AlMgSi1Mn alaşımında Zr mikrosegregasyonunun karakterizasyonu ve mikroyapıya etkisi

Öz

Bu çalışmada, otomotiv sektöründe kullanılan bir AlMgSi1Mn alaşımının ağırlıkça %0,3 Zr ilave edilerek modifikasyonu sonrasında döküm prosesinde meydana gelen zirkonyum mikrosegregasyonunun mikroyapı ve alaşımın yeniden kristallenmesine etkisi karakterize edilmiştir. Alaşımlar yarı sürekli döküm yöntemi ile endüstriyel boyutlarda döküldükten sonra mikroyapıları mikroskobik olarak incelenerek dökümde oluşan fazlar belirlenmiştir. Alaşımlarda döküm konumunda zirkonyum segregasyonun incelenmesi için elektron prob mikroanalizi yapılmıştır. Daha sonra alaşımlar endüstriyel koşullara uygun olarak homojenize edilmiştir. Homojenize edilen alaşımlardan alınan numuneler soğuk deforme edilerek tavlanmıştır. Bu numunelerde de elektron prob mikroanalizi yapılarak zirkonyum segregasyonunun yeniden kristallenme davranışına etkisi incelenmiştir. Analizler sonucunda dökümde katılaşma sırasında zirkonyumun alüminyum dendrit merkezlerine doğru segrege olduğu ve interdendritik bölgelerde çözünürlük sınırının aşılamadığı bölgelerde sonraki uygulanan deformasyon ve ısıl işlemler sonrasında bu bölgelerde deformasyon yapısının kaybolarak yeniden kristallenmeye neden olduğu bulunmuştur.

Anahtar Kelimeler

• AlMgSi1Mn alaşımı
• Al3Zr çökeltisi
• mikrosegregasyon
• yeniden kristallenme
• geçiş elementi

Teşekkür

Yazarlar, Kocaeli Üniversitesi Bilimsel Araştırma Projeleri Koordinasyon Birimi'ne maddi desteklerinden dolayı teşekkürlerini sunarlar.

Kaynakça

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