The effect of high yttrium solute concentration on the twinning behaviour of magnesium alloys

Stanford,N, Marceau,RKW and Barnett,MR 2015, The effect of high yttrium solute concentration on the twinning behaviour of magnesium alloys, Acta materialia, vol. 82, pp. 447-456, doi: 10.1016/j.actamat.2014.09.022.

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Title The effect of high yttrium solute concentration on the twinning behaviour of magnesium alloys
Author(s) Stanford,N
Marceau,RKWORCID iD for Marceau,RKW
Barnett,MRORCID iD for Barnett,MR
Journal name Acta materialia
Volume number 82
Start page 447
End page 456
Total pages 10
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2015-01
ISSN 1359-6454
Keyword(s) Deformation
Solute strengthening
Science & Technology
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Materials Science
Summary The deformation behaviour of two single phase binary alloys, Mg-5Y and Mg-10Y, have been examined. In compression, two twin types were observed, the common {101¯2} twin as well as the less common {112¯1} extension twin. It is shown that the {112¯1} twin is much less sensitive to solute concentration than the {101¯2} twin, and it is suggested that the simple atomic shuffle of the {112¯1} twin reduces the solute strengthening imparted by Y additions. The common {101¯2} twin showed significant hardening as a result of alloying with Y. An analysis of solute behaviour has indicated that of the four chemical parameters investigated, i.e. atomic size, shear modulus, electronegativity and solute distribution, it appears to be the larger atomic radius of Y compared to Mg that increases the stress required to activate the {101¯2} twin. It is suggested that the large atomic radius inhibits the atomic shuffling process which accompanies the twinning shear in this twin type.
Language eng
DOI 10.1016/j.actamat.2014.09.022
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©20115, Elsevier
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