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High Temperature Strength and Whisker/Matrix Interface of β Silicon Nitride Whisker Reinforced 6061 Aluminum Alloy

The 6061 aluminum alloy matrix composite reinforced with 13 vol% β-phase silicon nitride whisker was fabricated by squeeze casting and its high temperature strength and interface microstructure between whiskers and matrix were examination with TEM. As compared with the 6061 alloy, the strength of the composite increased about 20% and the elongation reached about 4% at room temperature. The strength beyond 300 o C was quite excellent