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PROCESSES FOR PRODUCING PRECURSOR FOR FUNCTIONALLY GRADIENT MATERIAL AND PRODUCING FUNCTIONALLY GRADIENT MATERIAL, PRECURSOR FOR FUNCTIONALLY GRADIENT MATERIAL, AND FUNCTIONALLY GRADIENT MATERIAL
PROCESSES FOR PRODUCING PRECURSOR FOR FUNCTIONALLY GRADIENT MATERIAL AND PRODUCING FUNCTIONALLY GRADIENT MATERIAL, PRECURSOR FOR FUNCTIONALLY GRADIENT MATERIAL, AND FUNCTIONALLY GRADIENT MATERIAL
The present invention provides a qualitatively-stable functionally gradient material precursor having gradient material composition, as well as a production method of the functionally gradient material precursor, at low cost. Further, the present invention provides a functionally gradient material having gradient material composition, or having both gradient material composition and gradient porosity, so as to achieve high-functionality; as well as a production method of the functionally gradient material. A functionally gradient material precursor is formed by the steps of: forming plural kinds of metal foam precursors, each obtained by performing heat treatment on a metal member so that a plurality of pores are generated within the metal member, by making the material composition of the metal member different; and friction stir welding the plural kinds of metal foam precursors. Further, a functionally gradient material is formed by performing heat treatment on the functionally gradient material.
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