24th Congress of International Council of the Aeronautical Sciences, 29 August-3, September 2004, Yokohama, Japan
Paper ICAS 2004-8.9.2

CONTINUOUS DYNAMIC RECRYSTALLIZATION OF EXTRUDED NIAL POLYCRYSTALS DURING SUPERPLASTIC DEFORMATION PROCESS

J. T. Guo, X. H. Du, G. Li
Superalloy Department of Institute of Metal Research, The Chinese Academy of Sciences, PRC

Keywords: NiAl, Superplasticity, continuous dynamic recrystallization

Deformation behavior and the associated deformation microstructures of extruded NiAl polycrystals were investigated. Elongations over 200% and m near to 0.30 under high strain rate (10-1s-1) at high temperature were observed. Continuous dynamic recrystallization caused a steadily flow stress and a favorable value of m, resulting in high fracture resistance and large plastic elongation.

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