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, wavelength dispersive spectroscopy, and in-situ synchrotron x-ray powder diffraction (S-PXRD) over a temperature range from 25 up to 400 A degrees C. The studied samples are mainly composed of a Cu11In9 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 reaction at T = 290 A degrees C and the other to the peritectic reaction at T = 311 A degrees C.
Journal of Phase Equilibria and Diffusion, 2014, Vol 35, Issue 1, p. 2-10
CHEMISTRY,; MATERIALS; METALLURGY; SYSTEM; DIFFUSION; CU11IN9; CU10IN7; Cu-In alloys; differential scanning calorimetry (DSC); intermetallic compounds; phase transitions; Alloys; Copper compounds; Differential scanning calorimetry; Intermetallics; Phase transitions; Scanning electron microscopy; X ray powder diffraction; Cu-in alloys; In compositions; In-situ synchrotrons; Nominal composition; Peritectic; Phase identification; Temperature range; Type structures; Copper alloys; THERMAL stability; Research; HASH(0x3b4edc8)