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Mechanical Annealing Under Low Amplitude Cyclic Loading in Micropillars

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The Investigation of Plastic Behavior by Discrete Dislocation Dynamics for Single Crystal Pillar at Submicron Scale

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Abstract

Mechanical annealing is an effective method to drive the dislocations out of the submicron sample. However, simultaneously significant shape change is always generated by plastic deformation under monotonic loading. In the present work, through discrete dislocation dynamic simulation, we find that low stress cyclic loading is a potential mechanical annealing method with virtually little change of the shape. A combined numerical and theoretical study has been performed to reveal the underlying mechanism. By comparing the evolution of dislocation junction under monotonic, cyclic and relaxation deformation, the cumulative irreversible slip is found to be the key factor of promoting junction destruction and dislocation annihilation at free surface under cyclic loading condition. By introducing this mechanism into dislocation density evolution equations, a theoretical model is proposed to predict the critical conditions for mechanical annealing under cyclic loading mode.

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Authors and Affiliations

  1. Tsinghua University, Beijing, China

    Yinan Cui

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  1. Yinan Cui
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Correspondence to Yinan Cui .

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Cui, Y. (2017). Mechanical Annealing Under Low Amplitude Cyclic Loading in Micropillars. In: The Investigation of Plastic Behavior by Discrete Dislocation Dynamics for Single Crystal Pillar at Submicron Scale. Springer Theses. Springer, Singapore. https://doi.org/10.1007/978-981-10-3032-1_5

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  • DOI: https://doi.org/10.1007/978-981-10-3032-1_5

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  • Publisher Name: Springer, Singapore

  • Print ISBN: 978-981-10-3031-4

  • Online ISBN: 978-981-10-3032-1

  • eBook Packages: EngineeringEngineering (R0)

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