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

作者：Donoso E^*; Espinoza R; Dianez M J; Criado J M

来源：Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2012, 556: 612-616.

DOI：10.1016/j.msea.2012.07.035

• Copper alloys
• DSC
• Kinetics
• Precipitation
• Cu-Ni-Si alloys

The precipitation processes in a Cu-2.8 at% Ni-1.4 at% 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 900 K shows the presence of one exothermic reaction attributed to the formation of delta-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 delta-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 delta-Ni2Si particles has been found.

• 出版日期2012-10-30