Pengaruh Penambahan Penguat Nano Al2O3 dan Perlakuan Panas Terhadap Karakteristik Komposit Al 7075 / Al2O3 Melalui Metode Pengecoran Tekan untuk Aplikasi Balistik = Effect of Nano Al2O3 Reinforcement Addition Percentage and Heat Treatment to AA 7075 / Al2O3 Composite Charactreristics Fabricated by Squeeze Casting Method for Ballistic Application.