Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 441, Issue 1-2, Pages 142-148Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2006.08.011
Keywords
binary NiAl intermetallics; large-gained; superplasticity; continuous dynamic recovery and recrystallization; high temperature deformation
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Superplasticity was found in single phase Ni-42AI alloy with initial grain size of 200 mu m under an initial strain rate of 1.25 x 10(-4) s(-1) to 2 x 10(-3) s(-1) in temperatures ranging from 1000 degrees C to 1100 degrees C. A maximum elongation of 306% was obtained under an initial strain rate of 1 x 10(-3) s(-1) at 1075 degrees C. Optical metallography (OM) observation showed that the average grain size was refined during superplastic deformation from initial 200 mu m to less than 20 mu m. Transmission electron microscopy (TEM) observation showed that an unstable subgrain boundary network was formed during superplastic deformation. The subgrain boundaries were transformed into low and high angle grain boundaries by absorbing gliding dislocations. The large-grained superplastic phenomenon could be explained by continuous dynamic recovery and recrystallization (CDRR). (c) 2006 Elsevier B.V. All rights reserved.
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