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Mechanical property changes in ion- irradiated metals: Part I. Ni-Cu alloys

  • Symposium on Irradiation-Enhanced Materials Science and Engineering
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Abstract

The effect of radiation-induced dislocation loops on hardness in ion-irradiated Ni-Cu alloys has been studied using a recently developed mechanical properties microprobe (MPM). Well-annealed Ni-10 at. pct Cu and Ni-50 at. pct Cu were irradiated with 14-MeV Ni ions to doses of 20 to 100 displacements per atom (dpa) peak damage (5 to 25 dpa at 1 μm) at 0.45T m (485 °C and 425 °C, respectively). Ultra-low load microindentation hardness measurements and transmission electron microscopy (TEM) were done using cross-sectional techniques. These methods allow for direct hardness measurements, which have been compared to the unirradiated material, of only the small irradiation zone (<3-μm deep). Irradiation induced a high density of dislocation loops, with the size and density of the loops dependent on composition and independent of irradiation conditions. This high dislocation loop density caused a large increase in hardness. A reasonable correlation was found between measured hardness changes and calculated changes based on dislocation loop sizes and densities.

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Authors and Affiliations

  1. Nuclear Engineering and Engineering Physics Department, Fusion Technology Institute, University of Wisconsin-Madison, 53706-1687, Madison, WI

    D. H. Plantz (Research Assistant), L. M. Wang (Research Assistant), R. A. Dodd (Professor) & G. L. Kulcinski (Professor)

Authors
  1. D. H. Plantz
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  2. L. M. Wang
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  3. R. A. Dodd
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  4. G. L. Kulcinski
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Additional information

This paper is based on a presentation made in the symposium “Irradiation-Enhanced Materials Science and Engineering” presented as part of the ASM INTERNATIONAL 75th Anniversary celebration at the 1988 World Materials Congress in Chicago, IL, September 25-29, 1988, under the auspices of the Nuclear Materials Committee of TMS-AIME and ASM-MSD.

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Plantz, D.H., Wang, L.M., Dodd, R.A. et al. Mechanical property changes in ion- irradiated metals: Part I. Ni-Cu alloys. Metall Trans A 20, 2681–2687 (1989). https://doi.org/10.1007/BF02670161

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