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Article

Anisotropic Plastic Behavior in an Extruded Long-Period Ordered Structure Mg90Y6.5Ni3.5 (at.%) Alloy

1
Department of Physical Metallurgy, CENIM-CSIC, Avenida Gregorio del Amo 8, 28040 Madrid, Spain
2
Departamento de Ingeniería Industrial, Universidad Nebrija, Campus Dehesa de la Villa, C. Pirineos 55, 28040 Madrid, Spain
3
Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Max-Planck-Str. 1, 21502 Geesthacht, Germany
4
Structural Research on New Materials, Helmholtz- Zentrum Geesthacht Outstation at DESY, Notkestraße 85, 22607 Hamburg, Germany
*
Author to whom correspondence should be addressed.
Crystals 2020, 10(4), 279; https://doi.org/10.3390/cryst10040279
Received: 12 March 2020 / Revised: 1 April 2020 / Accepted: 2 April 2020 / Published: 7 April 2020
(This article belongs to the Special Issue Processing and Characterization of Magnesium-Based Materials)
The Mg90Y6.5Ni3.5 alloy composed almost completely of the Long-Period-Stacking-Ordered (LPSO) phase has been prepared by casting and extrusion at high temperature. An elongated microstructure is obtained where the LPSO phase with 18R crystal structure is oriented with its basal plane parallel to the extrusion direction. Islands of α-magnesium are located between the LPSO grains. The mechanical properties of the alloy are highly anisotropic and depend on the stress sign as well as the relative orientation between the stress and the extrusion axes. The alloy is stronger when it is compressed along the extrusion direction. Under this configuration, the slip of <a> dislocations in the basal plane is highly limited. However, the activation of kinking induces an increase in the plastic deformation. In the transversal extrusion direction, some grains deform by the activation of basal slip. The difference in the yield stress between the different stress configurations decreases with the increase in the test temperature. The evolution of internal strains obtained during in-situ compressive experiments reveals that tensile twinning is not activated in the LPSO phase. View Full-Text
Keywords: magnesium alloys; long period stacking ordered structures (LPSO); synchrotron radiation diffraction magnesium alloys; long period stacking ordered structures (LPSO); synchrotron radiation diffraction
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MDPI and ACS Style

Garces, G.; Barea, R.; Stark, A.; Schell, N. Anisotropic Plastic Behavior in an Extruded Long-Period Ordered Structure Mg90Y6.5Ni3.5 (at.%) Alloy. Crystals 2020, 10, 279. https://doi.org/10.3390/cryst10040279

AMA Style

Garces G, Barea R, Stark A, Schell N. Anisotropic Plastic Behavior in an Extruded Long-Period Ordered Structure Mg90Y6.5Ni3.5 (at.%) Alloy. Crystals. 2020; 10(4):279. https://doi.org/10.3390/cryst10040279

Chicago/Turabian Style

Garces, Gerardo, Rafael Barea, Andreas Stark, and Norbert Schell. 2020. "Anisotropic Plastic Behavior in an Extruded Long-Period Ordered Structure Mg90Y6.5Ni3.5 (at.%) Alloy" Crystals 10, no. 4: 279. https://doi.org/10.3390/cryst10040279

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