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Hardness of FRHC-Cu Determined by Statistical Analysis

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Abstract

A statistical indentation method has been employed to study the hardness value of fire-refined high conductivity copper, using nanoindentation technique. The Joslin and Oliver approach was used with the aim to separate the hardness (H) influence of copper matrix, from that of inclusions and grain boundaries. This approach relies on a large array of imprints (around 400 indentations), performed at 150 nm of indentation depth. A statistical study using a cumulative distribution function fit and Gaussian simulated distributions, exhibits that H for each phase can be extracted when the indentation depth is much lower than the size of the secondary phases. It is found that the thermal treatment produces a hardness increase, due to the partly re-dissolution of the inclusions (mainly Pb and Sn) in the matrix.

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Acknowledgments

The corresponding authors would like to thank La Farga Lacambra Group for the materials supplied. Furthermore, the authors would like to thank the Linguistic Services at the University of Barcelona for linguistic and stylistic advice.

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Authors and Affiliations

  1. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica, CIEFMA-Universitat Politècnica de Catalunya. ETSEIB, Avda. Diagonal, 647, 08028, Barcelona, Spain

    J. J. Roa

  2. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica, Centro DIOPMA. Universitat de Barcelona. Facultat de Química, C/ Martí i Franquès, 1, 08028, Barcelona, Spain

    M. Martínez, F. Espiell & M. Segarra

  3. Instituto de Tecnología de Materiales, Universidad Politécnica de Valencia, Camí de Vera s/n, 46022, Valencia, Spain

    E. Rayón

  4. La Farga, Ctra. C-17 Km 73.5, Les Masies de Voltregà, 08508, Barcelona, Spain

    N. Ferrer

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  1. J. J. Roa
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  2. M. Martínez
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  3. E. Rayón
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  4. N. Ferrer
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  5. F. Espiell
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  6. M. Segarra
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Correspondence to J. J. Roa.

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Roa, J.J., Martínez, M., Rayón, E. et al. Hardness of FRHC-Cu Determined by Statistical Analysis. J. of Materi Eng and Perform 23, 637–642 (2014). https://doi.org/10.1007/s11665-013-0770-1

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  • DOI: https://doi.org/10.1007/s11665-013-0770-1

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