Microcalorimetric study of the annealing hardening mechanism of a Cu–2.8Ni–1.4Si (at%) alloy

The precipitation processes in a Cu–2.8at% Ni–1.4at% Si alloy were studied using differential scanning calorimetry (DSC), transmission electron microscopy (TEM) and microhardeness measurements. The analysis of the calorimetric curves from room temperature to 900K shows the presence of one exothermic...

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Veröffentlicht in:	Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2012-10, Vol.556, p.612-616
Hauptverfasser:	Donoso, E., Espinoza, R., Diánez, M.J., Criado, J.M.
Format:	Artikel
Sprache:	eng
Schlagworte:	Annealing ANNEALING PROCESSES Applied sciences CALORIMETRY Cold working, work hardening annealing, quenching, tempering, recovery, and recrystallization textures Copper Copper alloys COPPER ALLOYS (40 TO 99.3 CU) Copper base alloys Cross-disciplinary physics: materials science rheology Cu–Ni–Si alloys Differential scanning calorimetry DSC Exact sciences and technology Formations HARDNESS Heat treatment Kinetics Materials science Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology Metals. Metallurgy Physics Precipitation Production techniques Silicon Transmission electron microscopy Treatment of materials and its effects on microstructure and properties
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Zusammenfassung:	The precipitation processes in a Cu–2.8at% Ni–1.4at% Si alloy were studied using differential scanning calorimetry (DSC), transmission electron microscopy (TEM) and microhardeness measurements. The analysis of the calorimetric curves from room temperature to 900K shows the presence of one exothermic reaction attributed to the formation of δ-Ni2Si particles in the copper matrix that was confirmed by Transmission Electron Microscopy (TEM) and EDS microanalysis. The activation energies calculated for the precipitation of δ-Ni2Si was lower than the ones corresponding to diffusion of nickel and silicon in copper. A correlation between of microhardness of the alloy and the formation of δ-Ni2Si particles has been found.
ISSN:	0921-5093 1873-4936
DOI:	10.1016/j.msea.2012.07.035