Effect of precipitate shape and habit on mechanical asymmetry in magnesium alloys

Robson, Joseph D., Stanford, Nicole and Barnett, Matthew R. 2012, Effect of precipitate shape and habit on mechanical asymmetry in magnesium alloys, Metallurgical and materials transactions A, pp. 1-12.

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Title Effect of precipitate shape and habit on mechanical asymmetry in magnesium alloys
Author(s) Robson, Joseph D.
Stanford, Nicole
Barnett, Matthew R.
Journal name Metallurgical and materials transactions A
Start page 1
End page 12
Total pages 12
Publisher Springer
Place of publication New York, N.Y.
Publication date 2012-10
ISSN 1073-5623
Summary Asymmetric yield behavior in tension and compression is a common and usually undesirable feature of wrought magnesium alloys. To prevent yield asymmetry, it is necessary to favor slip over twinning, as it is the unidirectional nature of twinning combined with the strong textures produced in wrought magnesium alloys that produce yield asymmetry. In this article, the potential to use precipitates to strengthen selectively against twin growth is discussed. The effect of precipitate’s shape and habit on strengthening of slip and twinning is calculated using simple Orowan-based models. It is shown that basal plate precipitates, although being poor strengtheners against basal slip, are good strengtheners against twin growth. This is because they produce the maximum unrelaxed back-stress when they remain unsheared inside the twin. The predictions of the model have been validated against experiments for two alloys that form different precipitate types: AZ91 (basal plates). and Z5 (c-axis rods). Crystal plasticity modelling has been used to predict that an optimized distribution of basal plate precipitates is expected to strongly reduce yield asymmetry, even in strongly textured magnesium alloy.
Language eng
Field of Research 109999 Technology not elsewhere classified
Socio Economic Objective 970110 Expanding Knowledge in Technology
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2012, Springer
Persistent URL http://hdl.handle.net/10536/DRO/DU:30051172

Document type: Journal Article
Collection: Institute for Frontier Materials
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