Phase Identification of Cu-In Alloys with 45 and 41.25 at.% In Compositions

LAURA BAQUÉ; DARÍO TORRADO; GABRIELA AURELIO; DIEGO G. LAMAS; SERGIO ARICÓ; ALDO CRAIEVICH; SILVANA SOMMADOSSI

JOURNAL OF PHASE EQUILIBRIA AND DIFFUSION

SPRINGER

Lugar: Berlin; Año: 2014 vol. 35 p. 2 - 10

1547-7037

In this work, the thermal stability of Cu-In alloys with 45.0 and 41.2 at.% In nominal compositions was investigated by differential scanning calorimetry (DSC), scanning electron microscopy, wave length dispersive spectroscopy, and in-situ synchrotron x-ray powder diffraction (S-PX RD) over a temperature range from 25 up to 400 C. The studied samples are mainly composed of a Cu11In 9 phase together with minor amounts of the B phase (based on the NiAs -Ni2In type structure) and , in one of the samples, with a minor amount of pure In. No evidence of the Cu10In7 (41.2 at.% In) phase was detected, not even in the sample with 41.2 at.% In nominal overall composition. The combined use of the S-PXRD and DSC techniques allowed us to identify two phase transitions involving the Cu11In9 phase, one of them corresponding to the Eta´ <> B + Cu11In9 reaction at T = 290 C and the other to the peritectic Eta´ + L <> Cu11In9 reaction at T =311 C.