Influence of cobalt and chromium additions on the precipitation processes in a Cu-4Ti alloys

Authors

  • E. Donoso Universidad de Chile, Facultad de Ciencias Físicas y Matemáticas, Departamento de Ciencia de los Materiales

DOI:

https://doi.org/10.3989/revmetalmadrid.1042

Keywords:

Copper, Cu-Ti, Precipitation, Microcalorimetry

Abstract


The influence of 0.5 % atomic cobalt and 1 % atomic chromium additions on the precipitation hardening of Cu-4Ti alloy was studied by differential scanning calorimetry (DSC) and microhardeness measurements. The analysis of the calorimetric curves, for binary alloy, shows the presence of two overlapping exothermic reactions (stages 1 and 2) attributed to the formation of Cu4Ti and Cu3Ti particles in the copper matrix, respectively. DSC curves for Cu-4Ti-0,5Co alloy shows three exothermic effects (overlapping stages 3 and 4 and stage 5) associated to the formation of phases Ti2Co, TiCo and Cu4Ti, respectively. DSC curves for Cu-4Ti-1Cr alloy shows three exothermic reactions (stages 6, 7 and 9) and one endothermic peak (stage 8). The exothermic reactions correspond to the formation of phases Cr2Ti, Cu4Ti and Cu3Ti, respectively, and the endothermic reaction are attributed to the Cr2Ti dissolution. The activation energies calculated using the modified Kissinger method were lower than the ones corresponding to diffusion of cobalt, chromium and titanium in copper. Kinetic parameters were obtained by a convolution method based on the Johnson-Mehl-Avrami (JMA) formalism.Microhardness measurements confirmed the formation of the mentioned phases. Also, these measurements confirmed the effect of cobalt and chromium addition on the binary alloy hardness.

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Published

2010-12-30

How to Cite

Donoso, E. (2010). Influence of cobalt and chromium additions on the precipitation processes in a Cu-4Ti alloys. Revista De Metalurgia, 46(6), 542–547. https://doi.org/10.3989/revmetalmadrid.1042

Issue

Vol. 46 No. 6 (2010)

Section

Articles

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