Multimodal Microstructure Evolution in Wrought Mg-Zn-Y Alloys with High Strength and Increased Ductility

Michiaki Yamasaki; Kenji Hashimoto; Koji Hagihara; Yoshihito Kawamura

doi:10.4028/www.scientific.net/MSF.654-656.615

Paper Titles

Microstructure and Joint Strength of Similar- and Dissimilar Lap Joints Fabricated by Several Advanced Solid-State Welding Methods
p.596

Building Capability through Benchmarking and Technology Transfer
p.602

Temperature Dependence of Compressive Deformation Behavior of Mg₈₉Zn₄Y₇ Extruded LPSO-Phase Alloys
p.607

Thermal Stability and Mechanical Properties of Extruded Mg-Zn-Y Alloys with Long-Period Stacking Order Phase
p.611

Multimodal Microstructure Evolution in Wrought Mg-Zn-Y Alloys with High Strength and Increased Ductility
p.615

Preparation and Mechanical Property of Mg-Zn-Y Alloy with a Long Period Ordered Phase
p.619

Formation of a Novel X Phase in Mg–Gd–Zn–Zr Alloy
p.623

TEM Observation of Precipitates in a Mg-Gd-Sc Alloy with High Content of Sc
p.627

Effect of Sc Addition on Aging Behavior of Mg-Gd Alloys
p.631

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Multimodal Microstructure Evolution in Wrought Mg-Zn-Y Alloys with High Strength and Increased Ductility

Abstract:

High strength and ductile Mg96Zn2Y2 (at%) alloys with multi-modal microstructure are developed. Microstructure of the extruded Mg96Zn2Y2 alloy consists of three regions; the dynamically recrystallized -Mg fine-grains region, the hot-worked -Mg coarse-grains region elongated along extrusion direction, and the long-period stacking ordered (LPSO) phase region with kink deformation bands. Bimodal microstructure evolution in -Mg matrix is influenced by the morphology of the LPSO phase in the as-cast state, therefore, the effect of secondary dendrite arm spacing in cast state on the microstructure evolution and mechanical properties of the extruded Mg-Zn-Y alloy is investigated. An increase in the dynamically recrystallized grains improves ductility of the extruded alloys; the effective dispersion of the LPSO phase enhances strengthening of the alloy.