【摘 要】
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The macroscopically localized deformation behaviors of Ni-Co-based superalloys with different γ'pre-cipitate content were investigated at 500 ℃ and 1 × 10-4
【机 构】
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CAS Key Laboratory of Mechanical Behavior and Design of Materials,University of Science and Technolo
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The macroscopically localized deformation behaviors of Ni-Co-based superalloys with different γ'pre-cipitate content were investigated at 500 ℃ and 1 × 10-4 s-1 via an in situ method namely,digital image correlation (DIC).The DIC results showed that the serrated flow of the stress-strain curves was accom-panied by localized deformation of the specimens.The fracture morphology was characterized mainly by transgranular fracture with numerous dimples in the low γ'content alloy,and intergranular fracture with large fracture section in the high γ'content alloy.The Portevin-Le Chatelier (PLC) effect occurred in the investigated Ni-Co-based superalloys.Furthermore,the localized deformation of the high γ'con-tent alloy was more severe than that of the low γ'content alloy,and the band width was slightly larger.Moreover,for the first-time ever,a special propagation feature,namely +60° zigzag bands characterized by head-to-tail connections,was observed in the high γ'content alloy.
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