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Activation Energy Calculations for the Portevin–Le Chatelier Effect in Nimonic 263 Superalloy

  • Symposium: Multiscale Microstructure, Mechanics and Prognosis of High Temperature Alloys
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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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Acknowledgments

This work was partly supported by the High Technology Research and Development Program of China (No. 2014AA041701) and the National Natural Science Foundation of China (NSFC) under Grant Nos. 51171179, 51271174, 51331005, and 11332010.

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Authors and Affiliations

  1. Superalloy Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, P.R. China

    G. M. Han (Ph.D. Student), C. G. Tian (Ph.D. Student), Z. K. Chu (Associate Professor), C. Y. Cui (Professor), Z. Q. Hu (Professor) & X. F. Sun (Professor)

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  1. G. M. Han
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  2. C. G. Tian
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  3. Z. K. Chu
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  4. C. Y. Cui
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Correspondence to C. Y. Cui.

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Manuscript submitted November 15, 2014.

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Han, G.M., Tian, C.G., Chu, Z.K. et al. Activation Energy Calculations for the Portevin–Le Chatelier Effect in Nimonic 263 Superalloy. Metall Mater Trans A 46, 4629–4635 (2015). https://doi.org/10.1007/s11661-015-3000-7

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  • DOI: https://doi.org/10.1007/s11661-015-3000-7

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