Multiphase diffusion in the system Al-Mg

Diffusion couples between Al and Mg were investigated to study the formation, composition and growth of intermetallic phases in the Al-Mg system. Layers of the intermetallic compounds Al₃Mg₂ and Al₁₂Mg₁₇ were observed by optical microscopy. Composition-depth-curves of the diffusion zone were determined by electron microprobe analysis after annealing at various times and temperatures. The solid-solid phase equilibria of the Al-Mg system were redetermined between 604 and 706 K. Parabolic growth of both phases was observed in the whole temperature range. The growth of Al₃Mg₂ is faster than that of Al₁₂Mg₁₇ by about one order of magnitude. The pertaining activation enthalpies are 69 and 165 kJ mol^-1.

Beteiligte Wissenschaftler:

Prof. Dr. H. Mehrer (Leiter), Dipl.-Phys. M. Salamon, Dipl.-Phys. E. M. Tanguep Njiokep

Veröffentlichungen:

Tanguep Njiokep, E. M., M. Salamon, H. Mehrer: Growth of intermetallic phases in the Al-Mg system, Mat. Sci. Forum, in print