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Alumina short fiber reinforced composite zinc alloy solidification and interface


+3 Is reduced to the diffusion of silicon to melt the remaining resistance to block by the alumina-dimensional, because the fiber-reinforced metal matrix composites, the reinforcement in the face, Wo solute diffusion into the interface before the orange barriers Ⅲ. This makes the silicon can only be proud of short-range migration, Huan Lu _I those set in the interface. When the temperature dropped to the eutectic temperature, listless mining eutectic melt changes will occur in the eutectic transformation process, due to maintenance / matrix interface _I set a certain concentration of silicon, the author speculated that this process in two steps - first the aluminum and silicon on the fiber surface changes in Al-Si eutectic. Because the composite systems studied, only between silicon and fiber coherent relationship. '. , Silicon will give priority to the fiber surface nucleation and growth. At a time when the temperature (about 372 ℃> much lower than the eutectic temperature of silicon prostitution (577'C), plus there is a certain concentration of the interface of aluminum (see Table 1>, so the changes can be sawn silicon eutectic priority. Since the absolute content of silicon is low. When the bypass mechanism of Al-Si eutectic to grow,[link widoczny dla zalogowanych], the growth distance (that is growth from the previous slide the fiber surface) is not very far, therefore,[link widoczny dla zalogowanych], difficult to distinguish in the electron microscope. 'bulk processing, 2 [1995, followed by the Zn-Al eutectic transformation. When the Al-Si eutectic transformation of the free silicon is exhausted. this change to stop. As the former Al-rich phase has been formed on the basis of a change in the remainder of the solute-rich melt will continue to grow. precipitated the growth of zinc atoms enriched in the Al-rich phase (project phase) or the growth of two outfitting Jian side of plane for the phase-shaped edges week made a condition when the phase reaches a certain concentration of zinc atoms purpose , 1-phase to the side in the B-phase nucleation and growth of two-phase replaced the \the end of the eutectic transformation. Al-Si eutectic transformation when the silicon is always priority over the growth of n-phase leading to the above analysis, the study can be considered in the alumina / zinc alloy composite material, exist in the fiber / matrix interface of the front silicon eutectic alloy in the zinc to take advantage of the changing role of the leading phase, leading to changes in the eutectic fiber surface when the two parts made of silicon atoms in position set more. to provide for the formation of crystals were more non-spontaneous edge of the substrate, the resulting total number of multi-crystalline fine grains. 4 Conclusion (1) can be prepared by squeeze casting dense alumina / zinc alloy composite material, and the fiber distribution, matrix grain size small. ( 2) aluminum / zinc alloy composite materials, dimension and in the eutectic matrix bonded well, j bang Qi distinct interface layer. This is related to the interaction of alloying elements and fiber. (3) can be used in alumina fiber zinc alloy eutectic provide heterogeneous nucleation substrate, and can not be the primary phase of alumina-dimensional heterogeneous nucleation as the end of the village. (4> interface reaction makes the alumina is reduced in the part of the silica, silicon atoms enriched in the fiber / matrix interface, the priority on the fiber surface nucleation and growth, well in the zinc alloy eutectic coupled growth phase plays a leading role. (5) interface of silicon led to the village of Victoria to form the end of pull eutectic eutectic transformation consists of two parts; Al-Si eutectic Zn-Al eutectic transformation and transition into} the previous change in the latter provides the basis of shape edges. References 1 Ba assault and so on. low Michaelis Police Preform preparation AIzOa / Zn alloy composite materials. Fu Fang Institute of Metallurgy,[link widoczny dla zalogowanych], 1993,14 (4) 13 532 Ba governance and so on. solidification boil substrate mass transfer police and AbOI / AI interface of the composite panel co. Composite. Beijing: Aviation Industry Press. 1994,[link widoczny dla zalogowanych],5163 MortensenA.eta1.Columnardendritlcsolidificationjnametal--matrlx ~ ompos; te.Meta1]. Trans.1938, 19A, 7094LeviCG.eta1.Interlaceinteractionsduri ~ g [abr; cat ~ onolraluminumal1oy - a1.minafiberam Qiu ite.Metal1.Trans.1973 , 9Ar6975 planning policy and so on. alumina short-Die F-dimensional reinforced aluminum alloy composites of the interface. Composite Materials, 1991,[link widoczny dla zalogowanych],3 (4): 16 weeks value of the hammer, Liu. A1} os /-si alloy composite solidification Tissue. Composite Materials, 1990,7 (2) l317 week recommended such edge. Ran Cao ceramic particle reinforced zinc-based crystalline silicon particles in composite materials. Composite Materials, 1992.9 (3), 98 Received : September 1, 1994 a l3 a

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