TOLLEY Alfredo Juan
congresos y reuniones científicas
Microstructural Characterization of Heat Treated Al-Cu-Mg microalloyed with Si and Ge.
M. V. CASTRO RIGLOS; N. MORELLO; A. TOLLEY; V. RADMILOVIC
Congreso; X Interamerican Congress of Electron Microscopy 2009 and I Congreso de la Asociación Argentina de Microscopía (SAMIC 2009).; 2009
Transmission Electron Microscopy is an essential technique to follow the microstructural evolution during age hardening of Al based alloys. Microalloying additions often influence the micrstructural evolution significantly, resulting in improved mechanical properties. Among age hardenable Al alloys, one of the most important systems known at present is Al-Cu. In this system, hardness is enhanced by the formation of the θ and θ´ Al-Cu intermediate phases. Microalloying additions of Si and Ge in Al-Cu enhance age hardening effects by stimulating the nucleation of the θ´ intermediate phase .In Al-Cu-Mg alloys with a Cu/Mg ratio of around 1 (in at%), Cu- and Mg-rich Guinier-Preston-Bagaryatski zones, metastable intermediate phases and the equilibrium S phase have been reported to form during age hardening . In this work, the influence of microalloying additions of Si and Ge on the microstructural evolution during age hardening at 190ºC in an Al-Cu-Mg alloy was studied with transmission electron microscopy.