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Deformation behavior of mg-y-ni alloys containing different volume fraction of LPSO phase during tension and compression through in-situ synchrotron diffraction

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Journal of Magnesium and alloys 2024年第9期12卷 3631-3645页

作者： S.Z.Wu y.Q.Chi G.Garces X.H.Zhou H.G.Brokmeier X.G.Qiao M.y.Zheng School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China School of Electromechanical Engineering Guangdong University of TechnologyGuangzhou 510006China Department of Physical Metallurgy CENIM-CSICAvenida Gregorio del Amo 828040 MadridSpain Institute of Materials Science and Engineering Clausthal University of TechnologyAgricolastrasse 6D-38678 Clausthal-ZellerfeldGermany

The deformation behavior of the as-extruded mg-y-ni alloys with different volume fraction of long period stacking ordered(LPSO)phase during tension and compression was investigated by in-situ synchrotron *** micro-yielding,macro-yielding,tension-compression asymmetry and strain hardening behavior of the alloys were explored by combining with deformation *** micro-yielding is dominated by basal slip of dynamic recrystallized(DRXed)grains in tension,while it is dominated by extension twinning of non-dynamic recrystallized(non-DRXed)grains in *** macro-yielding,the non-DRXed grains are still elastic deformed in tension and the basal slip of DRXed grains in compression are ***,the LPSO phase still retains elastic deformation,but can bear more load,so the higher the volume fraction of hard LPSO phase,the higher the tensile/compressive macro-yield strength of the *** from the low volume fraction of the non-DRXed grains and the delay effect of LPSO andγphases on extension twinning,the as-extruded alloys exhibit excellent tension-compression *** the volume fraction of LPSO phase reaches∼50%,tension-compression asymmetry is reversed,which is due to the fact that the LPSO phase is stronger in compression than in *** tensile strain hardening behavior is dominated by dislocation slip,while the dominate mechanism for compressive strain hardening changes from twinning in theα-mg grains to kinking of the LPSO phase with increasing volume fraction of LPSO *** activation of kinking leads to the constant compressive strain hardening rate of∼2500 MPa,which is significantly higher than the tensile strain hardening rate.

关键词： mg-y-ni alloys LPSO phase In-situ synchrotron diffraction Micro-yielding Tensile-compression asymmetry Strain hardening

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Ultrahigh strength mg-y-ni alloys obtained by regulating second phases

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Journal of Materials Science & Technology 2020年第10期42卷 117-124页

作者： S.Z.Wu X.G.Qiao M.y.Zheng School of Materials Science and Engineering Harbin Institute of TechnologyHarbin150001China

mg-y-ni alloys with different second phases were designed by changing y/ni atomic ratio from 1.5 to *** microstructure and mechanical properties of as-cast and as-extruded alloys were *** as-cast mg-y-ni alloy with y/ni ratio of 1.5 is composed ofα-mg and long period stacking ordered(LPSO)*** y/ni ratio is equal to 1,nanoscale lamellarγ’phase and eutectic mg2ni phase are formed in addition to LPSO *** y/ni ratio decreases further,the amount of eutectic mg2ni phase increases,while the amount of LPSO phase *** extrusion,the LPSO andγ’phases are distributed along the extrusion direction,while eutectic mg2ni phase is broken and dispersed in the as-extruded *** phase and mg2ni phase in the alloys promote dynamic recrystallization(DRX)during extrusion,whileγ’phase inhibits ***,the mg96y2ni2(at.%)alloy with LPSO phase andγ’phase as the main second phases shows the strongest basal texture after *** tensile yield strength of the as-extruded mg-y-ni alloys increases first and then decreases with decreasing y/ni *** as-extruded mg96y2ni2(at.%)alloy with y/ni=1 exhibits excellent mechanical properties with tensile yield strength of 465 MPa,ultimate tensile strength of 510 MPa and elongation to failure of 7.2%,which is attributed to the synergistic effect of bulk LPSO phase and nanoscaleγ’phase.

关键词： mg-y-ni alloys LPSO γ’Phase mg2ni Mechanical properties

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