Showing papers by "Joachim Mayer published in 1987"

Crystalline and quasicrystalline phases formed by interdiffusion in evaporated Al–Mn thin films

Abstract: Bilayer and multilayer thin‐film systems of Al–Mn were evaporated onto carbon foils prepared on Mo grids. The Al/Mn ratios were chosen to provide enough Mn for the second phase formation. Heat treatments were carried out in situ in a high‐voltage electron microscope equipped with an ultrahigh vacuum specimen chamber. The appearance, growth, and transformation of the intermetallics were directly observed and studied by electron diffraction. Beside the crystalline phases the quasicrystalline i and T phases were also produced. The connection between the layer structures and the types of the intermetallics formed in the course of the heat treatments are shown.

Electron-Diffraction Study on an Amorphous Al-V Alloy Produced by Electron Irradiation of Quasicrystalline Al-16 at-%V

Abstract: La phase quasicristalline Al-16%atV est transformee a l'etat amorphe apres irradiation electronique a basse temperature dans un microscope electronique a haute tension. Analyse par diffraction electronique des alliages dans l'etat amorphe et cristallin apres traitement thermique. Determination du facteur de structure total. Calcul de la fonction de correlation de paires. Discussion des resultats en fonction des modeles topologiques courants de la structure des verres metalliques