Studi pengaruh temperatur dan waktu tahan perlakuan perlarutan terhadap pengerasan penuaan paduan aluminium Ac4B dengan kandungan unsur 0,078 Wt % Ti dan0,02 Wt %Sr = Study on the effect of temperature and holding time solution treatment to age hardening of aluminium AC4B alloy with addition 0.078wt. % Ti and 0.02 wt.% Sr ([Fakultas Teknik Universitas Indonesia, ], 2010)