Thermomechanical Processing of Thixomolded Alloys

Two phases dominate the performance of commercial Mg alloys: (1) b Mg 17 Al 12 and (2) porosity. Alloy design and process design to optimize the morphology of the first and to minimize the second are discussed. Second phase b can be designed to improve tensile strength, fatigue strength, toughness, texture, formability and corrosion resistance of Mg alloys. Processing is applied to refine the grain size, to array this phase in micron sizes at grain boundaries, and to further precipitate this phase in nanometer arrays within the grains. Therein, the 2nd phase b plays the following roles: (1) retarding grain growth, (2) randomizing texture, (3) Hall-Petch hardening, (4) Orowan hardening, and (5) moderating corrosion. Porosity is a detrimental 2nd phase common to cast Mg alloys in the form of gas or voids; its control being essential to engineering applications. Porosity can be diminished by sub-liquidus molding with high-velocity/high-pressure injection and then eliminated by subsequent hot deformation.

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Thermomechanical Processing of Thixomolded Alloys

Cited by 2 publications

References 10 publications

Evolution of the Intermetallic Particle Distribution in Thixomolded Magnesium Alloys

Evolution of the Intermetallic Particle Distribution in Thixomolded Magnesium Alloys

Alloy Design and Processing Design of Magnesium Alloys Using 2nd Phases

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