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Deformation mechanisms in submicron Be wires

Published online by Cambridge University Press:  21 August 2017

Frédéric Mompiou ,
Marc Legros  and
Sylvie Lartigue-Korinek
Frédéric Mompiou*
Affiliation:
Centre d'Elaboration de Matériaux et d'Etudes Structurales, UPR CNRS 8011 and Université de Toulouse, Toulouse 31055, France
Marc Legros
Affiliation:
Centre d'Elaboration de Matériaux et d'Etudes Structurales, UPR CNRS 8011 and Université de Toulouse, Toulouse 31055, France
Sylvie Lartigue-Korinek
Affiliation:
Institut de Chimie des Matériaux Paris Est, UMR CNRS 7182, Thiais 94320, France
*
a) Address all correspondence to this author. e-mail: mompiou@cemes.fr
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Abstract

Plastic deformation of small metallic single crystals has focused a lot of attention because of their enhanced or specific mechanical properties. Here, submicron beryllium wires, obtained from selective etching of an Al/Be eutectic alloy, were deformed in tension in situ using a transmission electron microscope. Our observations indicate that wires oriented parallel to their 〈c〉 axis and containing almost no dislocations present a fragile-like behavior associated to a high stress level. $\left\{ {10\bar 12} \right\}$ 〈1011〉 twins were also frequently observed near fractured wires, indicating that this deformation mode is important in small-scale Be. In a twinned area, a locally ductile behavior was observed due to the favorable orientation for prismatic slip. We also stress out the importance of a remaining outer layer, made of Al oxide, in the plastic deformation. On the basis of finite element modeling, we show that the deformation of the wire may involve dislocations moving along the wire axis, in or close to the Be/Al oxide interface, in agreement with in situ observations. Thus, even in naturally oxidized wires, the outer layer is supposed to play an important role in the deformation, not only in modifying a stress/strain field but also presumably in facilitating diffusional processes, such as dislocation climb or dislocation nucleation.

Keywords

transmission electron microscopydislocationsnanoscale
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 24: Focus Issue: Mechanical Properties and Microstructure of Advanced Metallic Alloys—in Honor of Prof. Haël Mughrabi PART B , 28 December 2017 , pp. 4616 - 4625
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Mathias Göken

References

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