GS(4)-21(GSW0116) Effect of Processing Parameters on Properties of Aluminum Based MMCs

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Aluminum-based metal matrix composites (Al-based MMCs) are attractive materials that can be used in various industrial fields. The unique characteristic of the materials is from the combination of lightweight, excellent ductility of the aluminum matrix and the high strength, high stiffness of reinforcements. Various matrix/reinforcement systems have been challenged to achieve the properties that meet the industrial requirements. In this study, aluminum-based composites reinforced with stainless steel fiber (Al/SSF composites) are investigated. Compared with metal/ceramics system, metal/metal composite can be produced at a relatively low cost since the metallic reinforcement can be easily obtained. Moreover, the toughness of the composite can be improved to some extents. On the other hand, however, in metal/metal system, the interface reaction between matrix and reinforcement during fabrication strongly affects the properties of the obtained composites. According to the previous investigations, the formation of interface reaction layers, hence the properties of the whole composite, are closely related to the fabrication parameters, such as temperature, pressure, and time. In this work, mixtures of aluminum powder and stainless steel fibers (SSF) were consolidated using a hot isostatic pressing method (HIP) to fabricate Al/SSF composites. This method is considered to be an effective metallurgical technology for producing well-consolidated products with strong interface bonding and reduced fabrication defects. The specimens were fabricated under different processing conditions. The properties such as density, hardness and tensile strength, as well as the microstructures of the composites were investigated. The effect of fabrication parameters on the microstructures and properties of the composites, and the effect of secondary treatment of rotary swaging for some specimens were discussed. The experimental results reveal that interface reaction tends to occur at temperatures higher than about 450℃, and forms an apparent interface layer between the matrix and SSF. The interface layer, which is regarded as a mixture of various intermetallic compounds, exhibits high hardness and brittle feature resulting in the composites with low ductility. In addition the rotary swaging treatment significantly increases the composite hardness and improves the fiber orientation.
一般社団法人日本機械学会の論文
2003-09-09

GS(4)-21(GSW0116) Effect of Processing Parameters on Properties of Aluminum Based MMCs

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