Grain size hardening in Mg and Mg-Zn solid solutions

Caceres, C. H., Mann, Gemma E. and Griffiths, J. R. (2011) Grain size hardening in Mg and Mg-Zn solid solutions. Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science, 42A 7: 1950-1959. doi:10.1007/s11661-010-0599-2

Author Caceres, C. H.
Mann, Gemma E.
Griffiths, J. R.
Title Grain size hardening in Mg and Mg-Zn solid solutions
Journal name Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science   Check publisher's open access policy
ISSN 1073-5623
Publication date 2011-07
Sub-type Article (original research)
DOI 10.1007/s11661-010-0599-2
Volume 42A
Issue 7
Start page 1950
End page 1959
Total pages 10
Place of publication New York, NY United States
Publisher Springer New York LLC
Collection year 2011
Language eng
Formatted abstract
Cast specimens of Mg and of several Mg-Zn binary alloys with a wide range of grain sizes were deformed in tension and compression. The k values calculated from the Hall-Petch (H-P) plots of the tensile 0.2 pct proof stress increased with the Zn content, from 0.24 MPa m 1/2 for pure Mg to ∼0.66 MPa m 1/2 for the 2.3 at. pct Zn alloy; k values measured from compression tests were larger, typically by 0.05 MPa m 1/2. When the strength measurements were corrected for the pseudoelastic strain resulting from elastic twinning, the k values generally increased, and the difference between tension and compression was eliminated. This showed that the larger k values obtained in compression using uncorrected data were an artifact of the pseudoelastic effect. The apparent friction stress varied between about 14 MPa for pure Mg to very low or negative values for the most dilute alloy, increasing again to about 8 MPa for the most concentrated alloy. The use of strength data corrected for pseudoelasticity effects is necessary for a consistent analysis of the grain size hardening.
Keyword Magnesium Single Crystals
Situ Neutron Diffraction
Hall Petch Parameters
Plastic deformation
Mechanical properties
Tensile Properties
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mechanical & Mining Engineering Publications
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Created: Fri, 22 Mar 2013, 15:54:09 EST by Brianne Mackinnon on behalf of School of Mechanical and Mining Engineering