Low-strain plasticity in a high pressure die cast Mg-Al alloy

Yang, K. Vanna, Caceres, C. H., Nagasekhar, A. V. and Easton, M. A. (2012) Low-strain plasticity in a high pressure die cast Mg-Al alloy. Modelling and Simulation in Materials Science and Engineering, 20 2: 1-9. doi:10.1088/0965-0393/20/2/024010


Author Yang, K. Vanna
Caceres, C. H.
Nagasekhar, A. V.
Easton, M. A.
Title Low-strain plasticity in a high pressure die cast Mg-Al alloy
Journal name Modelling and Simulation in Materials Science and Engineering   Check publisher's open access policy
ISSN 0965-0393
1361-651X
Publication date 2012-03
Sub-type Article (original research)
DOI 10.1088/0965-0393/20/2/024010
Volume 20
Issue 2
Start page 1
End page 9
Total pages 9
Place of publication Bristol, BS1 6BE United Kingdom
Publisher Institute of Physics Publishing
Collection year 2013
Language eng
Abstract The Kocks–Mecking method was used to compare the strain-hardening behavior at low strains of high pressure die cast Mg-9 mass% Al alloy and gravity cast fine grained pure Mg specimens. The alloy specimens exhibited a rounded flow curve in contrast with the pure metal’s for which macroscopic yielding occurred at a well-defined stress. Microhardness mapping of the crosssection of an alloy specimen showed a surface layer, or skin, with hardness values ~20 HV above those of the centre or core region. On the assumption that the core strain hardens at the same rate as the pure Mg specimen, it was estimated that ~20% of the alloy specimen’s cross-section was still elastic when the core reached full plasticity. The micromechanics of the elasto–plastic transition in the alloy specimens are discussed.
Keyword Magnesium Alloy
Hardening Behavior
Section Thickness
Internal Stresses
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2013 Collection
 
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