A detailed study of phase evolution in Cu 16at%Al and Cu 30 at%Al alloys under different types of mechanical alloying processes

M.F. GIORDANA; M.R. ESQUIVEL; E.ZELAYA

ADVANCED POWDER TECHNOLOGY

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2015 vol. 26 p. 470 - 477

0921-8831

The phase statbility of Cu-16 at%Al and Cu-30%atAl alloys obtained by a planetary and a horizontal mills was investigated. The analysis was carried out using X-ray diffraction and various transmission electron microscopy TEM techniques. X-ray difraction analysis gives a statistical overview of the main equilibrium phases present. Meanwhile, the different TEM techniques allow the detection of either the minor phases or the ones having crystalline domains smaller than 5 nm. The solid solution equilibrium alfa phase was obtained using both milling processes on the Cu 16at.%Al. Instead, the final intermetallics observed for Cu 30 at%al were not the equilibrium ones according to the phase diagram. The planetary mill produced a mixture of alfa and gamma 2 phases and less than a 2 at % of beta phase. The horizontal mill produced a gamma 2 phase and less than a 2 at % of alfa 2 and gamma phases. For both compositions, the horizontal mill seems to be more efficient to achieve the equilibrium intermetallic compound.