Elsevier

Scripta Materialia

Volume 193, 1 March 2021, Pages 49-54
Scripta Materialia

Deformation-induced ultrafine grains near fatigue crack tip and correlative fatigue damage in Al matrix composite

https://doi.org/10.1016/j.scriptamat.2020.10.040Get rights and content

Abstract

New insight into the microstructural evolution and the correlative damage mechanisms near fatigue crack tip in a TiB2/Al composite was conducted by transmission kikuchi diffraction and transmission electron microscopy. It was found that the micro deformation band formed from the crack tip and ran along slip planes. Ultrafine grains were induced in deformation band, where the fatigue crack preferring to grow along these deformation-induced boundaries was first demonstrated as the essential process of crack across parent grains and grain boundaries. Ahead of crack tip, the TiB2 particles can affect crack growth by impeding the successive propagation of deformation band.

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Declaration of Competing Interest

On behalf of all authors, we declare that we have no financial and personal relationships with other people or organizations that can inappropriately influence our work, there is no professional or other personal interest of any nature or kind in any product, service and/or company that could be construed as influencing the position presented in, or the review of, the manuscript entitled, “Deformation-induced ultrafine grains near fatigue crack tip and correlative fatigue damage in Al matrix

Acknowledgments

This work is sponsored by the project funded by China Postdoctoral Science Foundation (2019TQ0193, 2019M661497). The authors also appreciate the help from Dr. Li Guoliang (Bruker Nano Analytics Division, China) for TKD technique.

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