Phase Transitions, ( ISI ), Volume (85), No (1), Year (2012-1) , Pages (1-12)

Title : ( An investigation on the coarsening behavior of γ precipitate in GTD-111 Ni-base superalloy )

Authors: mohammad berahmand , Seyed Abdolkarim Sajjadi ,

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Morphology of 0 precipitates affects mechanical properties of Ni-base superalloys. In this research study, the coarsening behavior of 0 precipitates in Ni-base superalloy GTD-111 was investigated. The alloy was solution-treated at 1200C for 4 h and water quenched to obtain single size distribution of the precipitates. Aging at 1000C up to 200 h was carried out to examine the effect of aging time on the growth of 0 precipitates. The shape of 0 precipitates changed from sphere to oval and then to cube as the aging time was increased. Moreover, the coarsening of 0 precipitates started fast initially, whereas it slowed down as the growth continued, contrary to the Lifshitz–Slyozov–Wagner theory. The decelerated coarsening of 0 precipitates was attributed to the effect of elastic interaction energy and decrease in driving force. Finally, the activation energy for diffusion of solute atoms or the growth of 0 precipitates in GTD-111 alloy was calculated.

Keywords

, coarsening behavior; 0 precipitate; elastic interaction energy; GTD, 111 Ni, base
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@article{paperid:1025244,
author = {Berahmand, Mohammad and Sajjadi, Seyed Abdolkarim},
title = {An investigation on the coarsening behavior of γ precipitate in GTD-111 Ni-base superalloy},
journal = {Phase Transitions},
year = {2012},
volume = {85},
number = {1},
month = {January},
issn = {0141-1594},
pages = {1--12},
numpages = {11},
keywords = {coarsening behavior; 0 precipitate; elastic interaction energy; GTD-111 Ni-base alloy},
}

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%0 Journal Article
%T An investigation on the coarsening behavior of γ precipitate in GTD-111 Ni-base superalloy
%A Berahmand, Mohammad
%A Sajjadi, Seyed Abdolkarim
%J Phase Transitions
%@ 0141-1594
%D 2012

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