Effect of processing parameters on the tensile properties of alumina-fiber-reinforced magnesium
The effect of processing variables on the tensile properties of commercially pure (CP) magnesium reinforced with FP alumina fibers studied. Composite plates were cast at 698, 755, and 810 C, with a five-minute hold period prior to solidification. The properties of the composites were compared to those of both conventionally cast CP magnesium and ZE41A (Mg-4.2Zn-0.5Zr-1.25RE) composites. The tensile properties were found to be independent of casting temperature in the range 698 to 810 C, although the five-minute hold period significantly decreased the axial properties of the CP magnesium. The results indicated that, during processing, the time at temperature has a more-pronounced effect on tensile strength than the actual casting temperature. Increasing casting temperature was found to increase th MgO fiber-matrix reaction zone to a size comparable to that observed in conventionally processed ZE41A material. However, the strengths of the CP magnesium composites cast at the three different temperatures were significantly lower than that of ZE41A, indicating that the interfacial strengthening observed in ZE41A is not due to larger MgO reaction-zone particles. A possible explanation for the interfacial strengthening in ZE41A is the presence of zinc and aluminum in low concentrations, which act to enhance the bonding between the reaction zone and the metallic matrix.
- Research Organization:
- Southwest Research Inst., San Antonio, TX (USA)
- OSTI ID:
- 6370017
- Report Number(s):
- AD-A-178808/2/XAB
- Country of Publication:
- United States
- Language:
- English
Similar Records
Transmission-electron-microscopy study of alumina-fiber-reinforced magnesium composite. Final report
Tensile and fatigue behavior of alumina-fiber-reinforced magnesium composites
Related Subjects
360601* -- Other Materials-- Preparation & Manufacture
360603 -- Materials-- Properties
ALKALINE EARTH METALS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CASTING
CHALCOGENIDES
COMPOSITE MATERIALS
ELEMENTS
FABRICATION
FIBERS
INTERFACES
MAGNESIUM
MATERIALS
MATRIX MATERIALS
MECHANICAL PROPERTIES
METALS
OXIDES
OXYGEN COMPOUNDS
PARTICLES
PHASE TRANSFORMATIONS
PLATES
PROCESSING
REINFORCED MATERIALS
SOLIDIFICATION
TENSILE PROPERTIES
ZINC