Precipitation and Growth Kinetics in Mechanically Alloyed Ni–Al
2011 ◽
Vol 2011
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pp. 1-7
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Keyword(s):
The precipitation and growth kinetics ofγ′ precipitates, which are strengthening factors in Ni-base oxide dispersion strengthened (ODS) superalloys, were investigated. The cuboidal-typeγ′ 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 theγ′ precipitates and the matrix at the aging temperature of 800°C. The growth kinetics of theγ′ 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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2010 ◽
Vol 10
(8)
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pp. 5418-5421
Keyword(s):
2006 ◽
Vol 15-17
◽
pp. 678-683
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2012 ◽
Vol 715-716
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pp. 605-610
2008 ◽
Vol 18
(1)
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pp. 66-71
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Keyword(s):
Keyword(s):
2018 ◽
Vol 345
◽
pp. 012010
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Keyword(s):