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Mg Alloys: Challenges and Achievements in Controlling Performance, and Future Application Perspectives Read chapter Read first chapter

2018 | OriginalPaper | Chapter

Interaction Between Propagating Twins and Non-shearable Precipitates in Magnesium Alloys

Authors : Matthew R. Barnett, Huan Wang

Published in: Magnesium Technology 2018

Publisher: Springer International Publishing

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Abstract

The impact of non-shearable particles on the stress required to propagate a twin is examined using numerical and analytical techniques. Of particular note is the nature of this effect in magnesium alloys where twinning can count for a significant fraction of the plastic strain. Dislocation Dynamics simulations are employed to calculate the Orowan bypass stress. It is seen that the stress for bypass can exceed that for a single twinning dislocation but under some circumstances it may be similar. The conditions that give rise to different regimes of behaviour are mentioned and the significance for magnesium alloy design is described.

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previous chapter Development of Heat-Treatable High-Strength Mg–Zn–Ca–Zr Sheet Alloy with Excellent Room Temperature Formability
next chapter Effects of Severe Plastic Deformation on Mechanical Properties and Corrosion Behavior of Magnesium Alloys
Literature
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Jain, J., et al., The role of back stress caused by precipitates on {101–2} twinning in a Mg-6Zn alloy. Materials Science and Engineering A, 2015. 647: pp. 66–73.
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Stanford, N. and M.R. Barnett, Effect of particles on the formation of deformation twins in a magnesium-based alloy. Materials Science and Engineering A, 2009. 516(1–2): pp. 226–234.
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Hirth, J.P. and J. Lothe, Theory of dislocations. 1992, Florida: Krieger.
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Bacon, D.J., U.F. Kocks, and R.O. Scattergood, The effect of dislocation self-interaction on the orowan stress. Philosophical Magazine, 1973. 28(6): pp. 1241–1263.
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Wang, Y., et al., First-principles calculations of twin-boundary and stacking-fault energies in magnesium. Scripta Materialia, 2010. 62(9): pp. 646–649.
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Gharghouri, M.A., G.C. Weatherly, and J.D. Embury, The Interaction of Twins and Precipitates in a Mg-7.7at.%Al Alloy. Philosophical Magazine A, 1998. 78(5): pp. 1137–1149.
Metadata
Title
Interaction Between Propagating Twins and Non-shearable Precipitates in Magnesium Alloys
Authors
Matthew R. Barnett
Huan Wang
Copyright Year
2018
Book
Magnesium Technology 2018

Print ISBN: 978-3-319-72331-0

Electronic ISBN: 978-3-319-72332-7

Copyright Year: 2018

DOI
https://doi.org/10.1007/978-3-319-72332-7_56

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