Journal
ACTA MATERIALIA
Volume 120, Issue -, Pages 46-55Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2016.08.043
Keywords
Precipitation; Ion irradiation; Cu alloy; In-situ technique; Monte Carlo simulation
Funding
- US National Science Foundation [DMR-1306475]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1306475] Funding Source: National Science Foundation
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The kinetics of W precipitation in dilute Cu-W alloys during room temperature irradiation is investigated using in situ electrical resistivity measurements and transmission electron microscopy. For a series of alloys with W concentrations varying from similar to 1 at.% to 6 at.%, resistivity measurements show that high dose irradiation leads to steady-state solubility values which are concentration dependent, while electron microscopy shows that the precipitate structures are stabilized at high doses at a size of about 2 nm. These steady states are independent of the initial alloy microstructure: whether it is a solid solution or it contains large W precipitates within the Cu matrix. The effective tracer impurity diffusion coefficient of W in Cu in energetic displacement cascades is determined by in situ electrical resistivity measurements on multilayer structures of alternating Cu/W layers, yielding a value of 2.1 nm(2)/dpa. These multilayer structures are observed to undergo significant interfacial roughening during irradiation, showing signs of transforming from a 2-dimensional to 3-dimensional structure under prolonged irradiation. A model based on a dynamical competition between recoil mixing and thermal spike diffusion is proposed to explain these various results; it is implemented in kinetic Monte Carlo simulations. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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