Abstract
Transmission electron microscopy has been used to identify the products in cellularly transformed regions of alloys based on the Nimonic 80 A composition. The commercial alloy is shown to undergo a small degree of cellular transformation even after conventional heat treatments, while recrystallization is found to increase the incidence of this reaction type. Low carbon versions of this alloy demonstrate cellular precipitation over a wider range of heat treatments.
It is shown that the cellular reaction may take place in these alloys under a variety of different conditions and with a range of driving forces. Reasons for this unexpected behaviour are offered, as is a suggestion as to why the cellular reaction occurs on a local scale.
Similar content being viewed by others
References
H. I. Aaronson andH. B. Aaron,Met Trans. 3 (1972) 2743.
K. N. Tu andD. Turnbull,Acta Met. 15 (1967) 369.
E. Hornbogen,Met. Trans. 3 (1972) 2717.
G. R. Speich,Trans. AIME 227 (1963) 754.
M. S. Sulonen,Acta Met. 8 (1960) 669.
J. W. Cahn,ibid. 4 (1956) 217.
H. Gleiter andB. Chalmers,Prog. in Mater. Sci. 16 (1972) 1.
R. Fournelle andJ. B. Clark,Met. Trans. 3 (1972) 2757.
E. Nes andH. Billdal,Acta Met. 25 (1977) 1039.
B. E. Sundquist,Met. Trans. 4 (1973) 1919.
P. S. Kotval andH. Hatwell,Trans. Met. Soc. AIME 245 (1969) 1821.
E. L. Raymond,ibid. 239 (1967) 1415.
W. C. Hagel andH. J. Beattie,ibid. 215 (1959) 967.
E. A. Fell,Metallurgia 63 (1961) 157.
G. P. Sabol andR. Stickler,Phys. Stat. Sol. 35 (1969) 11.
C. S. Smith,Trans. ASM 45 (1953) 533.
K. Smidoda, W. Gottschalk andH. Gleiter,Acta Met 26 (1978) 1833.
T. B. Gibbons andB. E. Hopkins,Met. Sci. J. 8 (1974) 203.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Barlow, C.Y., Ralph, B. Observations of cellular transformation products in nickel-base superalloys. J Mater Sci 14, 2500–2508 (1979). https://doi.org/10.1007/BF00737041
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF00737041