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Portevin–Le Chatelier Effect in Nimonic 263 Superalloy

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

The Portevin–Le Chatelier (PLC) effect in the Nimonic 263 superalloy was investigated by tensile test at a wide temperature ranges from 293 to 1033 K and strain rates between 0.1 and 6.25 × 10−6 s−1. Simple binary alloys Ni-0.4C, Ni-24Cr and Ni-5(8)Mo were also tested in order to identify which elements were responsible for the PLC effect in the Nimonic 263 alloy. The results demonstrated that for Nimonic 263 alloy, PLC effect occurred at certain temperatures and low strain rates. Normal PLC effect exhibiting type-A and -(A + B) serrations was attributed to the enhanced solute diffusion with increasing temperature, while inverse PLC effect with type-C serration was caused by unlocking process. The activation energy for the normal PLC effect was calculated to be 68 kJ/mol, and diffusion of substitutional solutes such as Cr and Mo was identified to be responsible for the PLC effect. In comparison with the PLC effect in simple binary alloys, solute atmospheres formed by different kinds of atoms in Nimonic 263 alloy work more effectively, increasing locking strength and corresponding mean stress drop magnitude.

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Acknowledgments

This work was financially supported by “Hundreds of Talents Project” and National Basic Research Program of China (No. 2010CB631206) (Nos. 51171179, 51128101 and 51271174).

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Authors and Affiliations

  1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    Guo-Ming Han, Cheng-Gang Tian, Chuan-Yong Cui, Zhuang-Qi Hu & Xiao-Feng Sun

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  1. Guo-Ming Han
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  2. Cheng-Gang Tian
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  3. Chuan-Yong Cui
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  4. Zhuang-Qi Hu
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  5. Xiao-Feng Sun
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Correspondence to Chuan-Yong Cui.

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Han, GM., Tian, CG., Cui, CY. et al. Portevin–Le Chatelier Effect in Nimonic 263 Superalloy. Acta Metall. Sin. (Engl. Lett.) 28, 542–549 (2015). https://doi.org/10.1007/s40195-015-0230-z

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  • DOI: https://doi.org/10.1007/s40195-015-0230-z

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