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Hardness of FRHC-Cu determined by statistical analysis Roa Rovira, Joan Josep Martínez López, Mònica Rayón Encinas, Emilio Ferrer, N. Espiell Álvarez, Ferran Segarra Rubí, Mercè Coure Conductivitat elèctrica Propietats mecàniques Mètodes estadístics Copper Electric conductivity Mechanical properties Statistical methods 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. 2014-05-22T10:39:20Z 2014-05-22T10:39:20Z 2014-02 2014-05-22T10:39:20Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1059-9495 https://hdl.handle.net/2445/54385 629537 eng Reproducció del document publicat a: http://dx.doi.org/10.1007/s11665-013-0770-1 Journal of Materials Engineering and Performance, 2014, vol. 23, num. 2, p. 637-642 http://dx.doi.org/10.1007/s11665-013-0770-1 (c) ASM International , 2014 info:eu-repo/semantics/openAccess 6 p. application/pdf Springer Verlag Articles publicats en revistes (Ciència dels Materials i Química Física)