The cubic γ′ particle morphology evolution was studied during long time aging process in a powder metallurgy (P/M) Ni–based superalloy with Hf addition. The results show that, during long time aging process, the cubic γ′ particle splits into a doublet of plantes or an octet of cubes. The octet of cubes with low energy is a preferred shape, it splits no longer. The γ/γ′ lattice misfit varies with different Hf contents. The growth or coarsening process of γ′ precipitate can be roughly divided into interface controlling and strain controlling stages, the γ′ precipitate morphology is greatly influenced by the elastic interaction energy between γ′ particles.
ZHANG Xi-Wen
,
YU Fu-Meng
,
HU Ben-Fu
. EFFECT OF HAFNIUM CONTENT ON MORPHOLOGY EVOLUTION OF γ′ PRECIPITATES IN P/M Ni–BASED SUPERALLOY[J]. Acta Metall Sin, 2012
, 48(8)
: 1011
-1017
.
DOI: 10.3724/SP.J.1037.2012.00136
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