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Improving Aluminum Strength with Chemical Modification Based on Titanium and Boron Elements

Improving Aluminum Strength with Chemical Modification Based on Titanium and Boron Elements
E Rahman, R Kumar, V Monandes and R Yadi

Product Development and Industrial Standardization Center of Pekanbaru


In general, Al5TiB is added to hypoeutectic Al-Si alloys with Si levels <12%. The addition of Al5Tib grain refiner to hypoeutectic Al-Si alloy has been shown to be effective in increasing the mechanical properties of the alloy. While the addition of Al5TiB grain refiner to the Al-11% Si alloy master has never been done. This study aims to determine the effect of adding Al5TiB grain refiner to the microstructure and mechanical properties of Al-Si eutectic alloys (Si 11%). The mechanical property to be known after the addition of Al5TiB grain refiner is hardness. In this research Al-11% Si material was used. Al5TiB grain refiner added to Al-11% Si material to determine changes in microstructure and the value of violence that occurs. The results showed that the addition of Al5TiB would produce a large number of fine grains with a uniform distribution and shortening the distance between dendrite arms. The results of the hardness test showed that the hardness tended to increase with increasing levels of Al5TiB grain refiner added. The decreasing in the value of hardness in the addition of Al5TiB grain refiner with 0,15% is due to the addition of Al5TiB grain refiner has exceeded its maximum limit.

Secara umum, Al5TiB ditambahkan pada paduan Al-Si hipoeutektik dengan kadar Si <12%. Penambahan penghalus butir Al5Tib pada paduan Al-Si hipoeutektik terbukti efektif dalam meningkatkan sifat mekanik paduan. Sedangkan penambahan grain refiner Al5TiB pada master alloy Al-11% Si belum pernah dilakukan. Penelitian ini bertujuan untuk mengetahui pengaruh penambahan grain refiner Al5TiB terhadap struktur mikro dan sifat mekanik paduan eutektik Al-Si (Si 11%). Sifat mekanik yang perlu diketahui setelah penambahan penghalus butir Al5TiB adalah kekerasan. Dalam penelitian ini digunakan material Al-11% Si. Pemurni butir Al5TiB ditambahkan pada material Al-11% Si untuk mengetahui perubahan struktur mikro dan nilai kekerasan yang terjadi. Hasil penelitian menunjukkan bahwa penambahan Al5TiB akan menghasilkan butiran halus dalam jumlah besar dengan distribusi yang seragam dan memperpendek jarak antar lengan dendrit. Hasil uji kekerasan menunjukkan bahwa kekerasan cenderung meningkat dengan bertambahnya kadar penghalus butir Al5TiB yang ditambahkan. Penurunan nilai kekerasan pada penambahan grain refiner Al5TiB sebesar 0,15% disebabkan penambahan grain refiner Al5TiB telah melebihi batas maksimum.

 

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