Development of a Low Entropy, Lightweight, Multicomponent, High Performance (Hardness + Strength + Ductility) Magnesium-Based Alloy

Aiming to develop new generation lightweight alloys, a magnesium-based multicomponent alloy, Mg 70 Al 18 Zn 6 Ca 4 Y 2 (atomic %), was fabricated. Property investigations were performed on as-cast and as-extruded materials to perceive the variation in the microstructure and mechanical properties. Ma...

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Bibliographic Details
Published in:JOM (1989) 2023-02, Vol.75 (2), p.459-469
Main Authors: Tun, Khin Sandar, Nahata, Anchal, Vincent, Shantha, Gupta, Manoj
Format: Article
Language:English
Subjects:
Alloys
Aluminum
Aluminum base alloys
Automation
Casting alloys
Chemistry/Food Science
Compacting
Compressive strength
Continuous casting
Ductility
Earth Sciences
Elongation
Engineering
Entropy
Environment
Formability
Hardness
Intermetallic compounds
Investigations
Lightweight
Magnesium
Magnesium base alloys
Mechanical properties
Microstructure
Phases
Physics
Raw materials
Solid solutions
Technical Article
Vehicles
Yield stress
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Summary:Aiming to develop new generation lightweight alloys, a magnesium-based multicomponent alloy, Mg 70 Al 18 Zn 6 Ca 4 Y 2 (atomic %), was fabricated. Property investigations were performed on as-cast and as-extruded materials to perceive the variation in the microstructure and mechanical properties. Magnesium solid solution phase and three intermetallic compounds with blocky, dendritic and lamellar morphologies were evolved in cast alloy’s microstructure. The continuous phases (dendrites and lamellae) crushed into discontinuous, fine phases were observed in extruded alloy’s microstructure leaving blocky phases mostly untouched. Microstructure refinement, hardness and compressive property enhancements were realized in extruded alloy. Lightweight multicomponent alloys based on magnesium and aluminum alloys have so far been reported to be hard and brittle with very limited deformability in as-cast condition and as a result secondary processing such as extrusion and rolling are difficult to apply. The as-cast alloy exhibited a reasonable elongation of 6.9% and following extrusion the alloy showed an improved elongation of 13.7% together with exceptionally high yield and compressive strength of 388 MPa and 647 MPa. The properties of as-DMD and extruded alloy convincingly exceeded the properties of many existing commercial Mg alloys such as AZ31, AZ91 and WE 43.
ISSN:1047-4838
1543-1851
DOI:10.1007/s11837-022-05567-8