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Superplasticity of Nickel-Based Alloys with Micro- and Sub-Microcrystalline Structures

Published online by Cambridge University Press:  10 February 2011

V.A. Valitov ,
B.P. Bewlay ,
Sh. Kh. Mukhtarov ,
O.A. Kaibyshev  and
M.F.X. Gigliotti
V.A. Valitov
Affiliation:
Institute for Metals Superplasticity Problems, Ufa 450001, Russia
B.P. Bewlay
Affiliation:
General Electric Corporate Research and Development, Schenectady, NY 12301, USA
Sh. Kh. Mukhtarov
Affiliation:
Institute for Metals Superplasticity Problems, Ufa 450001, Russia
O.A. Kaibyshev
Affiliation:
Institute for Metals Superplasticity Problems, Ufa 450001, Russia
M.F.X. Gigliotti
Affiliation:
General Electric Corporate Research and Development, Schenectady, NY 12301, USA
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Abstract

This paper will describe the generation of micro- and sub-microcrystalline structures in two Ni-based alloys that are typically strengthened by phases, such as γ′ and γ″+δ. The relationship between the superplastic behavior and microstructure will be discussed. High strain deformation processing in the temperature range of 0.9 Tm to 0. 6Tm results in reduction of the initial coarse-grained structure (>100 µm) to a range of structures including microcrystalline (MC) (grain size <10 µm) and sub-microcrystalline (SMC) (grain size <1 µm) with increasing deformation. The influence of alloy chemistry and constituent phases on dynamic and static recrystallization is considered, and their effect on grain refinement is described. Low-temperature and high strain rate superplasticity can be observed in dispersionstrengthened alloys with SMC structures. It was established that in dispersion-hardened Ni alloys with SMC structures, superplasticity can be observed at temperatures 200-250°C lower than in alloys with MC structure.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 601: Symposium HH – Superplasticity-Current Status & Future Potential , 1999 , 43
Copyright
Copyright © Materials Research Society 2000

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