Non-isothermal Characterization of the Precipitation Hardening of a Cu-11Ni-19Zn-1Sn Alloy

Abstract

The precipitation hardening of a Cu-11Ni-19Zn-1Sn alloy has been studied by means of Differential Scanning Calorimetry (DSC), High-Resolution Transmission Electron Microscopy (HRTEM), and hardness measurements. The calorimetric curves, in the range of temperatures analyzed, show the presence of one exothermic reaction followed by an endothermic one. The exothermic DSC peak is due to the segregation of Cu2NiZn precipitates and it is associated to a noticeable improvement of the mechanical properties of the alloy. The endothermic effect is associated to the dissolution of the Cu2NiZn precipitates into the copper matrix for restoring the starting Cu-11Ni-19Zn-1Sn homogeneous solid solution. The reaction mechanisms of these processes have been proposed from the kinetic analysis of the exothermic and endothermic DSC signals. The results obtained point out that tin plays a decisive role on the precipitation hardening of the alloy, because age hardening is not observed in the case of a Cu-Ni-Zn ternary alloy of similar composition.

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Acknowledgments

The authors would like to acknowledge the Fondo Nacional de Desarrollo Científico y Tecnoloógico (FONDECYT) for financial support, Project No. 1140782. The access to specialized facilities and laboratories provided by the Instituto de Ciencias de Materiales de Sevilla, Spain and the Departamento de Ciencia de los Materiales, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile is also greatly appreciated.

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Correspondence to M. J. Diánez.

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Manuscript submitted September 26, 2016.

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Donoso, E., Diánez, M.J., Criado, J.M. et al. Non-isothermal Characterization of the Precipitation Hardening of a Cu-11Ni-19Zn-1Sn Alloy. Metall Mater Trans A 48, 3090–3095 (2017). https://doi.org/10.1007/s11661-017-4063-4

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Keywords

  • Differential Scanning Calorimetry
  • Quaternary Alloy
  • Kissinger Method
  • Differential Scanning Calorimetry Trace
  • Differential Scanning Calorimetry Peak