Abstract
Serrated flow in a Ni-Co base superalloy was investigated after subsolvus and super- solvus solution treatments at the temperatures of 400 and 450 by tensile loading at different strain rates. The results suggested that the sizes of the grain and secondaryphase of the alloy after super- solvus solution were larger than that of the alloy after subsolvus solution. The serrated flow exhibited inverse DSA behavior after two solution treatments, which was caused by the interaction between sub- stitutional solutes and mobile dislocations. The variation of critical strain of serrated flow after two solution treatments may be related to different spacing between secondaryand different densities of mobile dislocations during plastic deformation. The different densities of mobile dislocations and the diffusion controlled by grain boundary were responsible for the variation of stress drop of serrated flow after two solution treatments.
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