Pengaruh Milling Time Terhadap Pembentukan Intermetalik ɣ-TiAl Sebagai Reinforced Dalam Metal Matrix Composite (MMCs) Hasil Mechanical Alloying

Mohammad Badrus Soleh, Hariyati Purwaningsih
Submission Date: 2013-01-31 09:55:55
Accepted Date: 2013-09-20 16:17:31

Abstract


Paduan TiAl mempunyai berbagai keunggulan dalam sifat mekanik serta sifat termal. Senyawa intermetalik γ-TiAl mempunyai sifat mekanik dan sifat termal yang sangat baik sehingga sesuai apabila diaplikasikan sebagai penguat pada metal matrix composite (MMCs). Penelitian ini bertujuan untuk mensintesis paduan TiAl sehingga terbentuk  fasa intermetalik γ-TiAl yang homogen. Sintesa dilakukan dengan metode mechanical alloying menggunakan modification horizontal ball mill dengan komposisi paduan Ti-36%wt Al dan variasi milling time 0,10,20 jam dengan kecepatan tetap 350rpm. Hasil milling dikompaksi dan di-annealing pada temperatur 9000C selama 30menit.  Fasa intermetalik γ-TiAl terbentuk setelah proses mechanical alloying 20 jam. Hasil pengujian difraksi sinar X menunjukkan ukuran kristal sebesar 198.92Å pada fasa γ-TiAl, memiliki kekerasan 678,1HV.


Keywords


Kekerasan; Koefisien termal ekspansi; Mechanical alloying; Milling Time; Senyawa γ-TiAl

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