The objectives of the program were to fabricate and characterize magnesium alloy/alpha-SiC whisker composites and investigate methods for producing titanium/SiC whisker composites. Magnesium alloy composites were consolidated by spark sintering and two different liquid phase hot pressing techniques. Whisker alignment was produced by extrusion of camphene infiltrated green bodies prior to consolidation or by subsequent hot solid state extrusion. Hot pressing with the matrix almost entirely liquid gave AZ31B alloy/alpha-SiC ...
Techniques for processing as-grown whisker mats of Al2O3 and beta-SiC were improved. Nonwhisker debris could not be eliminated from the Al2O3 whiskers, but was significantly reduced compared to previous processing. Similar debris was removed from the beta-SiC whisker mats. Total cost of processing of the beta-SiC whiskers was significantly lower than for the Al2O3. Tensile properties for an aligned composite containing 18 v/o Al2O3 whiskers in an aluminum-2.5 silicon matrix ...
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