Characterization of aging behavior of precipitates and dislocations in copper-based alloys

Shigeo Sato, Yohei Takahashi, Kazuaki Wagatsuma, Shigeru Suzuki

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1 Citation (Scopus)


The growth of precipitates in a deformed Cu-Ni-Si alloy with an aging treatment and the rearrangement of dislocations were investigated using small-angle X-ray scattering method and XRD line-profile analysis. The small-angle X-ray scattering method was used for characterizing the growth behavior of the precipitates. The results showed that the precipitates grew gradually to a few nanometers in radius when aged under the condition that the alloy exhibited a maximum of the hardness due to precipitation hardening. The growth rate rose from the onset of the overaging, where the hardness started to decrease. The line-profile analysis of copper-based alloy diffraction peaks using modified Williamson-Hall and modified Warren-Averbach procedures yielded a variation in the dislocation densities of the alloy as a function of the aging time. The dislocation density of the alloy before the aging treatment was estimated to be 1.7×1015 m-2 and its high value was held up to the peak-aging time. With the onset of the overaging, however, the dislocation density distinctly decreased by about 1 order of magnitude indicating that a large amount of the dislocations rearranged to release the alloy from the high dislocation-density state. The results suggest that the massive rearrangement of dislocations was accompanied with coarsening of the precipitates.

Original languageEnglish
Article number017002PDJ
Pages (from-to)104-107
Number of pages4
JournalPowder Diffraction
Issue number2
Publication statusPublished - 2010 Jun


  • Aging treatment
  • Dislocation density
  • Precipitation
  • Small-angle X-ray scattering
  • XRD line-profile analysis


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