Influence of dilute impurities on the evolution of defect cascades in nickel
- Pacific Northwest Lab., Richland, WA (United States)
- Illinois Univ., Urbana, IL (United States). Dept. of Materials Science and Engineering
- Argonne National Lab., IL (United States)
We have employed transmission electron microscopy to study the formation of vacancy dislocation loops from defect cascades produced by a 50 key Kr{sup +} ion irradiation of Ni and its dilute alloys with Si and Al. An unusual and reproducible dependence of the loop collapse probabilities and loop size distributions on solute content was found. The results are explained by impurity caused changes in both the collisional and thermal spike (molten zone) phase of the defect cascade. Specific mechanisms include disruption of focussons by impurities to change the energy density profile within the collision cascade, interruption of replacement collision sequences, and interstitial trapping to reduce recombination during the thermal spike phase. Applying these mechanisms to a statistical distribution of the spatial extent of cascades and to the melt-zones, all the experimental observations can be explained.
- Research Organization:
- Argonne National Lab., IL (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38; FG02-91ER45439
- OSTI ID:
- 10170970
- Report Number(s):
- ANL/CP-74789; CONF-920970-4; ON: DE92019585
- Resource Relation:
- Conference: 3. conference on evolution of microstructure in metals during irradiation,Chalk River (Canada),29 Sep - 2 Oct 1992; Other Information: PBD: Apr 1992
- Country of Publication:
- United States
- Language:
- English
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