Abstract
Formation of A15 type Nb 3 Al phase at the interface between solid Nb and liquid Al in a bulky Nb/Al composite has been studied at as high temperatures as from 1873 to 2073 K. The A15-phase layer grows keeping the interfaces planar when heated at 2023 K or lower, whereas the interface adjacent to Nb solid solution, Nb S.S , becomes nonplanar when heated at 2073 K. It is suggested that the formation process of A15 phase consists of three stages; the rapid dissolution of Nb into liquid Al until nucleation of A15 phase at the Nb/Al interface, and the following two stages (1st and 2nd ones) for growth of A15 phase. The planar growth rate of A15-phase on the 1st stage is considerably faster than that on the 2nd one. A model for the planar growth rate of A15-1phase on the 2nd stage has been presented. The model is based on the unidirectional inter-diffusion fluxes of Nb and Al atoms in the three sequential regions of Nb S.S , A15 and σ-phases. The nonplanar growth of A15-phase will be detailed in Part II of the present study.
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