Oxide particle refinement in Ni-based ODS alloy

The mechanism of oxide particle refinement in a Ni-based ODS alloy is discussed from the point of view of orientation relationship between the oxide particles/Ni matrix. The coherency in Ni-based ODS alloys are confirmed to be size-dependent. Misfit parameter is calculated from the HRTEM analysis. F...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2016-01, Vol.649, p.250-253
Main Authors: Oono, Naoko, Tang, Q.X., Ukai, Shigeharu
Format: Article
Language:English
Subjects:
Coherence
Coherency
Dispersion hardening alloys
Interface energy
Lattice misfit
Mathematical analysis
Microstructure
Ni-ODS alloy
Nickel
Nickel base alloys
Oxide particle
Oxides
Solubility
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Summary:The mechanism of oxide particle refinement in a Ni-based ODS alloy is discussed from the point of view of orientation relationship between the oxide particles/Ni matrix. The coherency in Ni-based ODS alloys are confirmed to be size-dependent. Misfit parameter is calculated from the HRTEM analysis. FCC Y2Hf2O7 has better coherency to the FCC Ni matrix than those of YAH and YAG. The mechanism of particle growth is regulated by Ostwald ripening. Both solubility and interfacial energy are important for the particle refinement.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2015.09.094