Fabrication of Fiber Reinforced Metal using Superplastic Metal Powder as Matrix

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Newly developed method of fabricating FRM is discussed, which attempts to use superplastic matal powder,with has diffusion bondability, as metal matrix. In fabricating a FRM at the solid state, both failure or damage on fiber and chemical reaction at the interface must be avoided. For the purpose, superplastic zinc alloy (SPZ) powder was used used as a matrix matal of Sic fiber reinforced metal. Fine particles of SPZ were uniformly scattered into metal die and an alignment of fiber and repeated this procedure then compacted as a whole at relative low pressure and temperature. It should be noticed that temperature below 500゜C, the time of duration less than 30 min. and pressure below 150 MPa is the environmental condition in fabricating sound FRM. Assessment on mechanical properties was done by tensile test at 250゜C. Main results are following. (1) A relationship between the weight of binding powder per unit area and U.T.S., which exhibits that the weight of powder more than 0.05 g/cm^2 does not affect the strength of FRM at all. (2) A relationship between bonding pressure and U.T.S., which reveals an stable U.T.S. of FRM for bonding pressure ranging from 50 to 130 MPa.(3) A relationship between Volume fraction of fiber, Vf, and U.T.S. shows the U.T.S. riss steadily with increasing Vf. The value calculated by the rule of mixture also confirms this trends and obtained value is more than 80%. (4) The microscopic photographs of FRM showed the fibr free from damage and any failures and a functional action of powder of SPZ as binder is clearly recognized. (5) The ductility of the FRM if increased in this fabricating procedure, so 90゜ V bending work are succeeded under the temperature of 250゜C.