Pembentukan komposit matriks Al-4%Cu berpenguat 15% Vf dan 20% Vf Al2O3 melalui proses thixoforming dengan penambahan 4%Wt Mg = Fabrication and characterization of composite Al-4% Cu reinforced with 15% dan 20% Vf particle Al2O3 by thixoforming process with the addition of 4 wt mg (Fakultas Teknik Universitas Indonesia, 2014)