An ultra-high strength Mg-3Al-Zn alloy with low tension-compression yield asymmetry

•An ultra-high strength Mg-3Al-Zn alloy with low anisotropy was fabricated by mechanical milling, hot-press consolidation and extrusion.•The partially nanocrystallized structure was characterized by TEM.•The nanoscale and coherent MgO precipitates in the Mg matrix was characterized by TEM.•The macro...

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Bibliographic Details
Published in:Materials letters 2020-06, Vol.269, p.127489, Article 127489
Main Authors: Feng, J., Li, X.W., Sun, H.F., Fang, W.B.
Format: Article
Language:English
Subjects:
Asymmetry
Compressive strength
Elongation
Extrusion
High strength alloys
Magnesium base alloys
Magnesium oxide
Materials science
Mg alloy
Nanocrystallized structure
Nanoparticles
Precipitates
Recrystallization
Tension-compression yield asymmetry
Ultimate tensile strength
Yield stress
Zinc
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Summary:•An ultra-high strength Mg-3Al-Zn alloy with low anisotropy was fabricated by mechanical milling, hot-press consolidation and extrusion.•The partially nanocrystallized structure was characterized by TEM.•The nanoscale and coherent MgO precipitates in the Mg matrix was characterized by TEM.•The macro-texture of the as-extruded alloy was analyzed by XRD. An ultra-high strength Mg-3Al-Zn alloy with low tension-compression yield asymmetry was successfully fabricated through adding 0.2 wt% MgO. The as-extruded alloy exhibits a tensile yield stress of 459 MPa, an ultimate tensile strength of 519 MPa, an elongation to failure of 3.2%, and a low tension-compression yield asymmetry of 1.01. The combined effect of partially nanocrystallized structure, nanoscale and coherent MgO precipitates, and ultra-fine recrystallized Mg grains results in the ultra-high strength and further results in the low tension-compression yield asymmetry with additional effect of weak basal texture.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2020.127489