The phase equilibria of the ternary Al-AlCo-AlNi system were investiga
ted around the decagonal phase. Isopleths with 70, 71.5 and 72.5 at.%
Al and with 10 and 13 at.% Ni an elaborated with the aid of differenti
al thermoanalysis, magnetothermal analysis, optical microscopy and tra
nsmission electron microscopy. These are based on results of samples o
f more than 80 different compositions and on data from other isopleths
.