Abstract
Tensile experiments were performed on a rolled AZ31 alloy in an SEM at 323K (50°C), 423K (150°C), and 523K (250°C) in order to analyze the deformation mechanisms in-situ. Electron backscatter diffraction (EBSD) was performed both before and after deformation. The mechanical anisotropy was considerably reduced with temperature. Extension twinning was observed at 323K (50°C), but disappeared at 423K (150°C), indicating that the CRSS of non-basal systems becomes smaller than that of twinning at T<423K (150°C). From 423K (150°C) to 523K (250°C), a transition occurred in the dominant deformation mode from basal + prismatic <a> to mainly prismatic <a> slip. This is consistent with a decrease of the CRSS of non-basal slip systems with increasing temperature. In-situ tensile-creep experiments, performed at approximately the yield stress at 423K (150°C), indicated less slip and more grain boundary cracking occurs under creep deformation as compared to the higher-stress tensile experiments.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
A. Couret and D. Caillard, “An Insitu Study of Prismatic Glide in Magnesium .2. Microscopic Activation Parameters”, Acta Metallurgica, 33 (8) (1985), 1455–1462.
S. R. Agnew and O. Duygulu, “Plastic Anisotropy and the Role of Non-basal Slip in Magnesium Alloy AZ31B”, nt J Plast, 21 (6) (2005), 1161–1193.
M. R. Barnett, “A Taylor Model Based Description of the Proof Stress of Magnesium AZ31 during Hot Working”, Metall Mater Trans A, 34A (9) (2003), 1799–1806.
W. B. Hutchinson and M. R. Barnett, “Effective Values of Critical Resolved Shear Stress for Slip in Polycrystalline Magnesium and Other HCP Metals”, Scr Mater, 63 (7) (2010), 737–740.
M. R. Barnett et al., “A Semianalytical Sachs Model for the Flow Stress of a Magnesium Alloy”, Metall Mater Trans A, 37A (7) (2006), 2283–2293.
A. Chapuis and J. H. Driver, “Temperature Dependency of Slip and Twinning in Plane Strain Compressed Magnesium Single Crystals”, Acta Mater, 59 (5) (2011), 1986–1994.
B. Hutchinson et al., “Deformation Modes and Anisotropy in Magnesium Alloy AZ31”, nt J Mater Res, 100 (4) (2009), 556–563.
J. A. Del Valle et al., “Deformation Mechanisms Responsible for the High Ductility in a Mg AZ31 Alloy Analyzed by Electron Backscattered Diffraction”, Metall Mater Trans A, 36A (6) (2005), 1427–1438.
J. A. Del Valle and O. A. Ruano, “Separate Contributions of Texture and Grain Size on the Creep Mechanisms in a FineGrained Magnesium Alloy”, Acta Mater, 55 (2) (2007), 455–466.
J. Koike et al., “Grain-Boundary Sliding in AZ31 Magnesium Alloys at Room Temperature to 523 K”, Mater Trans, 44 (4) (2003), 445–451.
N. Stanford et al., “Deformation Mechanisms and Plastic Anisotropy in Magnesium Alloy AZ31”, Acta Mater, 59 (12) (2011), 4866–4874.
M. R. Barnett et al., “Role of Grain Boundary Sliding in the Anisotropy of Magnesium Alloys”, Scr Mater, 61 (3) (2009), 277–280.
C. J. Boehlert et al., “In situ Scanning Electron Microscopy Observations of Tensile Deformation in a Boron-Modified Ti-6Al-4V Alloy”, Scr Mater, 55 (5) (2006), 465–468.
C. J. Boehlert et al., “Slip System Characterization of Inconel 718 Using In-Situ Scanning Electron Microscopy”, Advanced Materials & Processes, 168 (11) (2010), 41–45.
A. S. Khan et al., “Mechanical Response and Texture Evolution of AZ31 Alloy at Large Strains for Different Strain Rates and Temperatures”, nt J Plast, 27 (5) (2011), 688–706.
A. D. Rollet and S. I. Wright, “Typical Textures in Metals”, Te ture and Anisotropy, ed. U. F. Kocks, et al. (Cambridge, Cambridge University Press, 1998), 179–239.
T. Obara et al., “[11–22](-1–123) Slip System in Magnesium”, Acta Metallurgica, 21 (7) (1973), 845–853.
M. F. Ashby and R. A. Verrall, “Diffusion-Accommodated Flow and Superplasticity”, Acta Metallurgica, 21 (2) (1973), 149–163.
A. K. Mukherje, “Rate Controlling Mechanism in Superplasticity”, Mater Sci Eng, 8 (2) (1971), 83–89.
20. C.J. Boehlert et al., “ n situ Analysis of the Tensile and Tensile-Creep Deformation Mechanisms in Rolled AZ31”, Acta Mater, in print.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2012 TMS (The Minerals, Metals & Materials Society)
About this chapter
Cite this chapter
Chen, Z., Boehlert, C., Gutiérrez-Urrutia, I., Llorca, J., Pérez-Prado, M.T. (2012). Tensile and Creep Deformation Mechanisms in Rolled AZ31. In: Mathaudhu, S.N., Sillekens, W.H., Neelameggham, N.R., Hort, N. (eds) Magnesium Technology 2012. Springer, Cham. https://doi.org/10.1007/978-3-319-48203-3_19
Download citation
DOI: https://doi.org/10.1007/978-3-319-48203-3_19
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-48571-3
Online ISBN: 978-3-319-48203-3
eBook Packages: Chemistry and Materials ScienceChemistry and Material Science (R0)