The contribution of long-period stacking-ordered structure (LPSO) to high strength-high ductility combination and nanoscale deformation behavior of magnesium-rare earth alloy

The nanoscale deformation behavior of high strength (240MPa)-high ductility (21.4%) combination Mg-rare earth alloy with long-period stacking-ordered structure was studied via nanoindentation and electron microscopy, and the behavior compared with the low strength (65MPa)-good ductility (15%) alloy...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2018-01, Vol.713, p.112-117
Main Authors: Li, K., Injeti, V.S.Y., Misra, R.D.K., Meng, L.G., Zhang, X.G.
Format: Article
Language:English
Subjects:
Deformation
Deformation mechanism
Deformation mechanisms
Ductility
High strength
Long-period stacking-ordered structure (LPSO)
Magnesium
Magnesium-rare earth alloy
Matrix
Mechanical properties
Nanoindentation
Nanoparticles
Nanoscale deformation behavior
Rare earth alloys
Slip
Stacking
Trace elements
Twinning
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Summary:The nanoscale deformation behavior of high strength (240MPa)-high ductility (21.4%) combination Mg-rare earth alloy with long-period stacking-ordered structure was studied via nanoindentation and electron microscopy, and the behavior compared with the low strength (65MPa)-good ductility (15%) alloy without LPSO structure. In non-LPSO alloy, basal slip mainly occurred, while in LPSO-containing alloy, the LPSO changed the deformation mechanism to extensive non-basal slip and deformation twinning. The intrinsic good plasticity of LPSO and its impact on the deformation mechanism of Mg matrix contributed to superior mechanical properties and nanoscale deformation behavior of Mg-rare earth alloys, without compromising the ductility.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2017.12.056