Region 1 deformation mechanisms in high strain rate superplastic IN9021
- Michigan State Univ., East Lansing, MI (United States). Dept. of Materials Science and Mechanics
- Univ. of California, Davis, CA (United States). Dept. of Chemical Engineering and Materials Science
The deformation mechanisms for region 1 deformation in high rate superplastic mechanically alloyed IN9021 were analyzed using creep and superplastic data. Three threshold stresses are identified, an apparent threshold stress at the lowest superplastic strain rate, and two threshold stresses obtained by extrapolation of the superplastic data using stress exponents of n = 2 and n = 3. All of these threshold stresses are strongly temperature dependent. The deformation in region 1 has been identified as a transition between the superplastic deformation mechanism and a dislocation creep mechanism dependent upon thermally activated detachment of dislocations from particles. Region 1 deformation can be modeled with a composite model. The mechanisms are described, and implications for developing high rate superplastic materials are identified.
- OSTI ID:
- 194196
- Report Number(s):
- CONF-950201-; ISBN 0-87339-300-7; TRN: IM9611%%19
- Resource Relation:
- Conference: Annual meeting and exhibition of the Minerals, Metals and Materials Society (TMS), Las Vegas, NV (United States), 12-16 Feb 1995; Other Information: PBD: 1995; Related Information: Is Part Of Superplasticity and superplastic forming, 1995; Ghosh, A.K. [ed.] [Univ. of Michigan, Ann Arbor, MI (United States)]; Bieler, T.R. [ed.] [Michigan State Univ., East Lansing, MI (United States)]; PB: 290 p.
- Country of Publication:
- United States
- Language:
- English
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