日本金属学会誌

J. Japan Inst. Metals, Vol. 60, No. 12 (1996),
pp. 1163-1172

Enhancement of High Temperature Mechanical Strength of TiNi Fiber/AlComposite Induced by Shape Memory Effect

Yasubumi Furuya1 and Minoru Taya2

1Department of Materials Processing, Faculty of Engineering, Tohoku University, Sendai
2Department of Mechanical Engineering, University of Washington, WA 98195, USA

Abstract:

This paper describes the shape memory effects of TiNi fiber Al matrix (TiNi/Al) composites on enhancement of its mechanical properties: tensile and fatigue resistance. A TiNi/Al composite was processed by a powder metallurgical route. The yield stress and fatigue resistance showed that they would increase with prestrain at temperature above the austenitic finish temperature of TiNi fiber (Af). The increases in tensile properties (yield stress) and fatigue resistance were attributed to the compressive stress field in the matrix which was induced when prestrained TiNi fibers shrank to its initial length upon heating above Af. The predictions based on the analytical model agreed reasonably well with the experiment.


(Received April 19, 1996)

Keywords:

intelligent material, shape memory alloy, fiber reinforced composite, concurrent material design, powder metallurgy, sintering, material strengthening, equivalent inclusion model, residual stress

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