𝜸′ precipitation and growth kinetics in mechanically alloyed ni–al

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ID: 195779
2011
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Abstract
The precipitation and growth kinetics of γ′ precipitates, which are strengthening factors in Ni-base oxide dispersion strengthened (ODS) superalloys, were investigated. The cuboidal-type γ′ precipitates are formed in conventional arc-melted Ni–Al alloys, whereas spherical-type precipitates are formed in the mechanically alloyed (MAed) specimens. The morphology is controlled by a lattice misfit between the γ′ precipitates and the matrix at the aging temperature of 800°C. The growth kinetics of the γ′ precipitates can be followed by Ostwald ripening. The Arrhenius plot yielded a lower activation energy for the solute atom diffusion in MAed specimens, which is attributed to their high dislocation density and nanosized grains.
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Authors ;QingXin Tang;Shigeharu Ukai;Akinobu Minami;Shigenari Hayashi
Journal bulletin of the korean chemical society
Year 2011
DOI
10.1155/2011/137387
URL
http://dx.doi.org/10.1155/2011/137387
Keywords
materials of engineering and construction mechanics of materials

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