Publikacje

Abstract:

Using aluminum bronze and titanium foils, CuAl10Fe3Mn2 - intermetallic phases laminated composites have been fabricated through reactive bonding at 875 degrees C in vacuum. Investigations were concerned with the structural transformations of a bronze - Ti couple boundary. Holding for a few minutes resulted in the formation of a thin layer at the interface. Prolongation of the heating time lead to reactions in the liquid state and completely disappearing of titanium layers. Thus, the final microstructure consisted of alternating layers of intermetallics and unreacted CuAl10Fe3Mn2 bronze. The microstructure was revealed in optical and scanning electron microscopy (SEM). The study exhibited the presence of different reaction products in the diffusion zone and their chemical compositions were determined by X-ray microprobe analysis. The occurrence of different intermetallic compounds such as TiCu, Ti2Cu, tau(1) (TiCu2Al) and tau(2) (TiCuAl) was predicted from the ternary phase diagram Ti-Cu-Al. The predominant part of the intermetallic layers was the mixture of TiCuAI and TiCu2Al phases, since a liquid front of reaction was moving into the aluminum bronze. The microhardness of the reaction products and the elemental components was comparatively measured.

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MICROSTRUCTURE EVOLUTION OF LAMINATED ALUMINUM BRONZE - INTERMETALLICS COMPOSITE