The Effect of Zr on LM6 Aluminum Alloy

Yıl 2019, , 105 - 113, 15.12.2019

Tansel Tunçay

https://doi.org/10.17100/nevbiltek.634068

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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