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- Title
Alloy Design and Processing Design of Magnesium Alloys Using 2nd Phases.
- Authors
Decker, R. F.; LeBeau, S. E.; Berman, T. D.; Jones, J. W.; Miller, V. M.; Pollock, T. M.
- Abstract
Two phases dominate the performance of commercial Mg alloys: (1) β Mg17Al12 and (2) porosity. Alloy design and process design to optimize the morphology of the first and to minimize the second are discussed. Second phase β 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 β 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.
- Subjects
ALLOYS; CRYSTAL grain boundaries; GRAIN size; INJECTION molding; CORROSION resistance; MAGNESIUM alloys
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2019, Vol 71, Issue 7, p2219
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-019-03482-z