Studi pengaruh kombinasi komposisi 0,1 Wt. % Ti dan 0,003, 0,018 dan 0,025 Wt. % Sr terhadap karakteristik paduan AC4B hasil low pressure die casting = Study on combination effect 0.1 wt. % Ti and 0.003, 0.018 and 0.025 wt. % Sr on characteristic of AC4B alloy produced by low pressure die casting (Fakultas Teknik Universitas Indonesia, 2009)