Researches Regarding Improvement of the Fatigue Limit by Heat Treatments of the Al-Alloys for Aeronautics Industry - DONIGA, Ana; VASILESCU, Elisabeta; ISTRATE, Miltiade; VASILESCU, Ioan; MACUTA, Silviu (The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science, 2005)