Crystallographic characterization of Cu-In alloys with 45 and 41.25 at.% In compositions

L. BAQUÉ; D. TORRADO; G. AURELIO; D. G. LAMAS; A. CRAIEVICH; S. 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 (SEM), wavelength dispersive spectroscopy (WDS) and in-situ synchrotron X-ray powder diffraction (S-XPD) over a temperature range from 25 up to 400 °C. The studied samples are mainly composed of a Cu11In9 phase together with minor amounts of the B phase and, in one of the samples, with 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-XPD and DSC techniques allowed us to identify two phase transitions involving the Cu11In9 phase, one of them corresponding to the B + Cu11In9 ↔ η? reaction at T = 290 °C and the other to the peritectic Cu11In9 ↔ η? + L reaction at T = 311 °C.