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Microstructural characterization of ordered intermetallic phase Al5MnTi2 with Ll1 superstructure.

100%

Jezierska E.

tom R. XIX, nr 4

888-891

Macroalloyed with manganese Al3Ti+Mn alloys (4 and 10,5% at. Mn) were investigated by transmission electron microscopy (TEM) using JEM 100B and JEM 3010 Jeol microscopes. TEM samples were prepared by electrochemical polishing and ion beam thinning. Fine tetragonal precipitates of Al2Ti observable by TEM in cubic Ll2 ordered matrix might be responsible for the unusual brittleness of the off-stoichiometric composition of the Al67Mn4Ti29 alloy. For Al63Mn10,5Ti26,5 alloy more typical are antiphase domains with the size less than 30 nm. Long range order Ll2, and symmetry group were confirmed from the results of conventional and convergent beam electron diffraction (CBED) on Al3Ti+Mn polycrystals. The dislocations structure is typical for ordered phases; superdislocations, complex stacking faults, by-passing mechanism.