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.
CitacióRoa, J.J. [et al.]. Hardness of FRHC-Cu Determined by Statistical Analysis. "Journal of materials engineering and performance", Febrer 2014, vol. 23, núm. 2, p. 637-642.