Thermodynamic Characterization of Al-10Si-xMg Alloy with CALPHAD Methodology

Abstract

Aluminum and its alloys are widely used in the automotive, aerospace space, and defence industries due to their low density, high specific strength, corrosion resistance, high electrical and thermal conductivity properties. Generally, heat treatment and deformation processes are applied in aluminum alloys in order to increase the strength of the materials. A significant increase in strength can be achieved in aluminum alloys with the addition of magnesium and copper as alloying elements. The properties of the materials vary depending on their chemical compositions, processes, and microstructures. In this modeling and simulation study, the effect of varying wt.% Mg ratios in Al-10Si-xMg alloy on the material was investigated and thermodynamic analyzes were carried out using the CALPHAD methodology. TCAL7.1 aluminum database in the Thermo-Calc software version 2021a was used in the modelling and simulation studies. The effect of varying wt.% Mg ratio in Al-10Si-xMg alloy on liquidus, solidus, and eutectic reaction temperatures observed in Al-Si alloys was investigated. In addition, it is thought to contribute to the Turkish literature by determining the formation temperatures and amounts of Mg2Si precipitates, which increase strength with heat treatment.

Keywords

• Aluminum
• CALPHAD Methodology
• Thermo-Calc
• Al-Si-Mg Alloy
• Heat Treatment

Al-10Si-xMg Alaşımının CALPHAD Metodolojisi ile Termodinamik Karakterizasyonu

Abstract

Alüminyum ve alaşımları düşük yoğunluk, yüksek spesifik mukavemet, korozyon dayanımı, yüksek elektriksel ve ısıl iletkenlik özelliklerinden dolayı otomotiv, havacılık ve uzay, savunma sanayilerinde yaygın olarak kullanılmaktadırlar. Genellikle malzemelerin mukavemetlerinin artırılması bakımından, alüminyum alaşımlarında ısıl işlem ve deformasyon prosesleri uygulanmaktadır. Magnezyum ve bakır alaşım elementlerinin ilavesi ile alüminyum alaşımlarında kayda değer bir mukavemet artışı sağlanabilmektedir. Malzemelerin özellikleri; malzemelerin kimyasal kompozisyonlarına, proseslerine ve mikroyapılarına bağlı olarak değişmektedir. Bu modelleme ve simülasyon çalışmasında, Al-10Si-xMg alaşımında değişen % ağırlıkça Mg oranlarının malzeme üzerindeki etkisi incelenmiş ve CALPHAD metodolojisinin kullanımı ile termodinamik analizleri gerçekleştirilmiştir. Modelleme ve simülasyon çalışmalarında Thermo-Calc yazılımı 2021a versiyonundaki TCAL7.1 alüminyum veri tabanı kullanılmıştır. Al-10Si-xMg alaşımında değişen % ağırlıkça Mg oranının liküdüs, solidüs ve Al-Si alaşımlarında görülen ötektik reaksiyon sıcaklıklarına etkisi incelenmiştir. Ayrıca ısıl işlem ile mukavemet artışı sağlayan Mg2Si çökeltilerinin oluşum sıcaklıkları ve miktarları belirlenerek Türkçe literatüre katkı sağlanması düşünülmüştür.

Keywords

• Alüminyum
• CALPHAD Metodolojisi
• Thermo-Calc
• Al-Si-Mg Alaşımları
• Isıl İşlem

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