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Title: Microstructure of ion-irradiated nickel and nickel-copper alloys

Abstract

Pure nickel and three concentrated Ni-Cu alloys, namely, Ni-10Cu (at.%), Ni-25Cu and Ni-50Cu, with various oxygen (residual or pre-injected) and helium (pre-injected) contents were irradiated with 14-MeV nickel or copper ions up to a peak damage level of {approximately}100 dpa at the same homologous temperature of 0.45 T{sub m} to study the effects of gas and copper concentrations on the formation of radiation-induced defect clusters. The depth-dependent microstructures of the damaged region in the irradiated samples were analyzed by cross-section transmission electron microscopy techniques. Pre-injection of a small amount (10 to 75 appm) of helium or oxygen have considerably enhanced void formation in the irradiated pure nickel. The residual oxygen has also been found to play an important role in promoting void formation. Lowering the total oxygen content of the nickel samples from 180 appm to 75 appm considerably reduced the void density and increased void size. The experimental results on the effect of oxygen in this study support recent theoretical models which predict that oxygen can stabilize voids by reducing the metal surface energy and that gas is necessary for voids to form in nickel. The Ni-Cu alloys showed great resistance to void formation under the irradiation conditions.

Authors:
Publication Date:
Research Org.:
Wisconsin Univ., Madison, WI (USA)
OSTI Identifier:
7198472
Resource Type:
Thesis/Dissertation
Resource Relation:
Other Information: Thesis (Ph. D.)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; NICKEL; PHYSICAL RADIATION EFFECTS; NICKEL ALLOYS; COPPER IONS; DEFECTS; HELIUM; ION BEAMS; MICROSTRUCTURE; NICKEL IONS; OXYGEN; VOIDS; ALLOYS; BEAMS; CHARGED PARTICLES; CRYSTAL STRUCTURE; ELEMENTS; FLUIDS; GASES; IONS; METALS; NONMETALS; RADIATION EFFECTS; RARE GASES; TRANSITION ELEMENTS; 360106* - Metals & Alloys- Radiation Effects; 360102 - Metals & Alloys- Structure & Phase Studies

Citation Formats

Wang, L M. Microstructure of ion-irradiated nickel and nickel-copper alloys. United States: N. p., 1988. Web.
Wang, L M. Microstructure of ion-irradiated nickel and nickel-copper alloys. United States.
Wang, L M. 1988. "Microstructure of ion-irradiated nickel and nickel-copper alloys". United States.
@article{osti_7198472,
title = {Microstructure of ion-irradiated nickel and nickel-copper alloys},
author = {Wang, L M},
abstractNote = {Pure nickel and three concentrated Ni-Cu alloys, namely, Ni-10Cu (at.%), Ni-25Cu and Ni-50Cu, with various oxygen (residual or pre-injected) and helium (pre-injected) contents were irradiated with 14-MeV nickel or copper ions up to a peak damage level of {approximately}100 dpa at the same homologous temperature of 0.45 T{sub m} to study the effects of gas and copper concentrations on the formation of radiation-induced defect clusters. The depth-dependent microstructures of the damaged region in the irradiated samples were analyzed by cross-section transmission electron microscopy techniques. Pre-injection of a small amount (10 to 75 appm) of helium or oxygen have considerably enhanced void formation in the irradiated pure nickel. The residual oxygen has also been found to play an important role in promoting void formation. Lowering the total oxygen content of the nickel samples from 180 appm to 75 appm considerably reduced the void density and increased void size. The experimental results on the effect of oxygen in this study support recent theoretical models which predict that oxygen can stabilize voids by reducing the metal surface energy and that gas is necessary for voids to form in nickel. The Ni-Cu alloys showed great resistance to void formation under the irradiation conditions.},
doi = {},
url = {https://www.osti.gov/biblio/7198472}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1988},
month = {1}
}

Thesis/Dissertation:
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