Effects of aging and fast-cooling on the mechanical properties of Mg-14Li-3Al-3Ce alloy

Effects of aging and fast-cooling on the mechanical properties of Mg-14Li-3Al-3Ce alloy were investigated. Processing of aging and fast-cooling effectively refines microstructure and control the precipitation of intermetallics. Refined microstructures, enhanced tensile strengths and increased ductil...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2017-03, Vol.689, p.195-202
Main Authors: Muga, C.O., Guo, H., Xu, S.S., Zhang, Z.W.
Format: Article
Language:English
Subjects:
Aging
Aging (metallurgy)
Alloys
Beta phase
Cooling
Cooling effects
Crystallization
Ductility
Fast-cooling
Grain boundaries
Grain refinement
Hardening rate
Intermetallic compounds
Magnesium base alloys
Mechanical properties
Mg-14Li-3Al-3Ce alloy
Precipitation hardening
Solution strengthening
Tensile properties
Tensile strength
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Summary:Effects of aging and fast-cooling on the mechanical properties of Mg-14Li-3Al-3Ce alloy were investigated. Processing of aging and fast-cooling effectively refines microstructure and control the precipitation of intermetallics. Refined microstructures, enhanced tensile strengths and increased ductility were realized. Microstructures phase analysis depicts presence of dominant single coherent bcc β-phase and intermetallics. The as-cast Mg-14Li-3Al-3Ce alloy exhibits YS of 72.6MPa, UTS of 104.3MPa with ductility of 5.8%. Mg-14Li-3Al-3Ce alloys that were aged for longer hours show higher age-hardening response than the as-cast alloy. The alloy that was aged for 15h depicts YS of 105.5MPa, UTS of 136.8MPa and strain of 19.2%. Prolonged aging and fast-cooling activates grains/grain boundary refinement. The alloys exhibit high tensile strength after age-hardening response and fast-cooling processing. Precipitation of coherent bcc β-phase contributes to enhanced ductility where as intermetallics and strain aging enhances the tensile strength. Fast-cooling enhanced Mg-14Li-3Al-3Ce alloys strength through grain refinement, crystallization and solid solution strengthening.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2017.02.059