The Effect of Zr on LM6 Aluminum Alloy

Öz

In this study, the effect of Zr amount on LM6 alloys which were produced by conventional casting method and contained different amounts of Zr (0.05% and 0.15) on the microstructure and  mechanical properties of the alloys was investigated. In addition, produced alloys were modified with 200-250 ppm Strontium (Sr). optic microscope (OM) and scanning electron microscopy (SEM / EDS analysis) were used for microstructure analysis. The hardness and tensile tests of the alloys which were modified by Sr and alloyed with different amounts of zirconium were performed. As a result of the studies that were done, it was determined in the images of optical microscope (OM) and scanning electron microscope (SEM) that the morphology of Al-Si-Fe phase changed depending on the addition of Zr, and that Al-Si-Fe intermetalics having different amounts of Zr composed. While the highest level of percent elongation was obtained from the Al12Si alloy, the highest level of hardness and maximum tensile strength were obtained from the LM6 alloy modified by strontium. The highest level of yield strength was obtained from LM6 alloy which was alloyed with 0.05 Zr. It was found that the amount of added Zr did not show a significant difference at the maximum tensile strength level of Al12Si alloy.

Anahtar Kelimeler

• Al-Si alloys,modification,alloyed,microstructure

LM6 Alüminyum Alaşımlarında Zr’nin Etkisi

Öz

Bu çalışmada, konvansiyonel döküm yöntemiyle üretilen ve alaşımların mikroyapı ve mekanik özellikleri üzerine farklı miktarlarda Zr (% 0,05 ve 0,15) içeren LM6 alaşımları üzerindeki Zr miktarının etkisi incelenmiştir. Ek olarak, üretilen alaşımlar 200-250 ppm Strontium (Sr) ile modifiye edilmiştir. Mikroyapı analizlerinde optik mikroskop (OM) ve taramalı elektron mikroskobu (SEM / EDS analizi) kullanılmıştır. Farklı miktarlarda zirkonyum ilave edilen ve Sr ile modifiye edilmiş alaşımların sertlik ve gerilme testleri yapılmıştır. Yapılan çalışmalar sonucunda, optik mikroskop (OM) ve taramalı elektron mikroskobu (SEM) görüntülerinde, Al-Si-Fe fazının morfolojisinin Zr ilavesine bağlı olarak değişmiştir. En yüksek yüzde uzama Al12Si alaşımından elde edilirken, stronsiyum tarafından modifiye edilen LM6 alaşımından en yüksek sertlik ve maksimum gerilme dayanımı elde edilmiştir. En yüksek akma dayanımı 0.05 Zr ile alaşımlı olan LM6 alaşımından elde edilmiştir.. Eklenen Zr miktarının, Al12Si alaşımının maksimum çekme dayanımında önemli bir fark göstermediği bulunmuştur.

Anahtar Kelimeler

• Al-Si alaşımları,modikasyon,alaşımlama,mikroyapı

Kaynakça

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