Abstract
The Portevin–Le Chatelier (PLC) effect in the Nimonic 263 superalloy was investigated by tensile test in a wide temperature range, from room temperature to 1033 K (760 °C), and at strain rates between 0.1 and 4 × 10–4 s–1. Types A, B, and C serrations were observed depending upon the test temperatures and strain rates. The activation energy (Q) for serrated flow was determined by employing various methodologies for T < 723 K (450 °C), where a normal PLC effect was observed. The value of Q was found to be independent of the method employed. The average Q value of 70 KJ/mol was found to be in agreement with that for diffusion of substitutional solutes such as Cr and Mo in a Ni matrix by pipe diffusion. At temperatures ranging from 723 K to 923 K (450 °C to 650 °C), type C serrations and an inverse PLC effect were noticed, which may be caused by unlocking process.
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