Microstructure and Mechanical Properties of TiNi Short Fiber Reinforced Al-Matrix Smart Composite Fabricated by Hot Extrusion

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  • 1515 熱間押し出し法により作製した TiNi ショートファイバー強化 Al マトリックススマートコンポジットの組織と機械的性質

Abstract

Aluminum alloy powder containing a 20vol% TiNi SMA alloy short fiber was hot-extruded into a composite. The microstructure and mechanical properties of the composite thus obtained were examined. Aluminum alloy powder containing 20vol% TiNi short fiber was easily extruded into a composite at 773K without blistering. A dense reaction layer 20μm thick was formed along the boundary between the fiber and the matrix by a heat treatment performed at 873K for 7.2ks after the hot-extrusion. The thickness of the interface formed at 873K increased from the outside of the fiber toward the inside with increasing heating time, and the structure of the interface changed from double to triple-layer type. The yield strength of the composite treated at 373K was higer by about 40MPa than that at 293K.

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