Effect of atmosphere and heating mode on sintering of 6711 and 7775 alloys C. Padmavathi1, A. Upadhyaya1 and D. Agrawal*2 The current study examines the effect of sintering atmosphere and heating mode on the densification, microstructure, phase analysis and properties of Al–1Mg–0?8Si–0?25Cu (6711) and Al–7Zn–2?5Mg–1Cu (7775) alloys.