Abstract
In this work, the flow behaviors and microstructure evolution of a powder metallurgy nickel-based superalloy during superplastic compression is investigated. Based on the strain rate sensitivity m determined by flow data, superplastic region is estimated at relatively low temperature and strain rate domains, specifically around 1000 °C/10−3 s−1. Thereafter, the cylinder specimens are isothermally compressed at 1000 °C/10−3 s−1 and 1025 °C/10−3 s−1 with different strains, to exam the superplasticity and related mechanisms. The experimental results indicate that the accumulated dislocations are mainly annihilated by dynamic recovery and dynamic recrystallization (DRX), and the grain boundary sliding (GBS) contributes to the total strain during superplastic compression as well. In addition, the cavities and cracks at triple junctions or interfaces between matrix and second phase particle have not been detected, which is different from superplastic tensile deformation.
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