A DETAILED STUDY OF PHASE EVOLUTION IN Cu-16at.%Al AND Cu-30at.%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 stability of Cu-16at.%Al and Cu-30at.%Al alloys obtained by a planetary and an horizontal mills was investigated. The analysis was carried out using X-ray diffraction and various transmission electron microscopy (TEM) techniques. X-ray diffraction 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 a phase was obtained using both milling processes on the Cu-16at.percentAl. Instead, the final intermetallics observed for Cu-30at.percentAl were not the equilibrium ones according to the phase diagram. The planetary mill produced a mixture of alpha and gamma2 phases and less than a 2 at. % of beta phase. The horizontal mill produced a gamma2 phase and less than a 2 at. % of alpha2 and gamma phases. For both compositions, the horizontal mill seems to be more efficient to achieved the equilibrium intermetallic compound.