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On the Characteristic Features of Dislocations during Ratcheting–Creep Interaction

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Abstract

The present investigation systematically represents for the first time the density and role of characteristic dislocations in controlling ratcheting and ratcheting–creep behavior of A356 Al alloy. The dislocation characteristics were evaluated using the modified Williamson–Hall method from x-ray diffraction profile analysis. The obtained results indicated that the strain accumulation during ratcheting increased with an increase in both mean stress (σm) and stress amplitude (σa). The dislocation density of all the deformed specimens increased by at least three orders of magnitude compared to the specimen in as-received condition. Further, ratcheting was primarily controlled by significant variation of screw dislocations, and its quantitative fraction was inversely varied with applied σm and σa. Ratcheted+crept specimens, on the other hand, showed the dominance of edge dislocations. The creep deformation followed by ratcheting was associated with work softening, with an inverse relationship between the quantity of edge dislocations and strain accumulation. This variation in quantity and nature of dislocations was due to the effects of the annihilation of dislocations and the type of loading in the respective phenomenon.

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Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, National Institute of Technology Rourkela, Rourkela, 769008, India

    Krishna Dutta, Pushpendra Kumar Dwivedi & Chinnam Sivateja

  2. Department of Mechanical Engineering, School of Engineering and Technology, GIET University, Gunupur, 765022, India

    Srimant Kumar Mishra

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Dutta, K., Mishra, S.K., Dwivedi, P.K. et al. On the Characteristic Features of Dislocations during Ratcheting–Creep Interaction. J. of Materi Eng and Perform 30, 7376–7385 (2021). https://doi.org/10.1007/s11665-021-05934-7

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