Abstract
Complex wrought magnesium-based alloys suffer from poor ductility, strong yield asymmetry, and lower than desired fatigue performance. These unfavourable properties are exacerbated by the heterogeneity of the microstructure and strong texture forming in Mg alloys during conventional thermo-mechanical processing. For the user, severe plastic deformation (SPD) increases flexibility in tailoring the microstructures and selecting the properties to be emphasized in wrought Mg alloys. The effect of SPD by hot multiaxial forging and equal channel angular pressing on the formation of fine grain microstructure and on resultant mechanical properties is discussed. It is demonstrated that SPD is capable of substantial enhancement in ductility and tensile strength which gives rise to concurrent improvement of both low- and high-cycle fatigue properties. The main message of this overview is that the full potential for improving fatigue performance of Mg alloys can be taken advantage of by way of comprehensive understanding the role of the individual effects associated with the SPD-induced microstructures and textures.
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ACKNOWLEDGMENTS
This manuscript could not have been completed without cooperation from my colleagues—professors Y. Estrin (Monash University, Australia), D. Orlov (Lund University, Sweden), and H. Miyamoto (Doshisha University, Japan). Special thanks go to Prof. M. Markushev and his team (Ufa Institute for Metals Superplasticity Problems, Russia) who performed SPD-processing of the materials for this study as well as to my colleagues from Togliatti State University (Russia)—Prof. D.L. Merson, M. Linderov, and E. Vasilev who carried out a large part of experimental work included in this overview. Financial support from the Russian Science Foundation through the grant-in-aid No. 15-19-30025 is gratefully appreciated.
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Dedicated to Professor Dr. Haël Mughrabi on the occasion of his 80th birthday. It is my pleasure and honor to dedicate this paper to Professor Haël Mughrabi, who has been a mentor and a colleague to me over the years, in appreciation of his outstanding contributions and accomplishments in the area of fatigue of advanced materials.
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Vinogradov, A. Effect of severe plastic deformation on tensile and fatigue properties of fine-grained magnesium alloy ZK60. Journal of Materials Research 32, 4362–4374 (2017). https://doi.org/10.1557/jmr.2017.268
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DOI: https://doi.org/10.1557/jmr.2017.268