Journal
SCRIPTA MATERIALIA
Volume 161, Issue -, Pages 18-22Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2018.10.004
Keywords
Ferritic alloys; Precipitation; Heat-treatment; Coherency; Elastic strain
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Funding
- Department of Energy (DOE), Office of Fossil Energy Program, United States [DE-FE0005868]
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The effect of precipitate structures of a B2-NiAl/L2(1)-Ni2TiAl hierarchical precipitate-strengthened ferritic alloy on the precipitate/matrix interface, elastic strain, and creep resistance has been investigated by systematic heat treatments and creep experiments. The experimental results reveal that the highest creep strength was achieved in a heat-treated sample containing the largest coherent precipitate with fine internal networks, whereas the semi-coherent precipitate results in a sharp drop of the creep strength. It was found that the strong elastic strain field, affected by the internal structure within the precipitate, plays a crucial role in improving the creep resistance. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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