Iron impurity in aluminum alloys forms coarse needle-shaped intermetallic compounds during solidification and hampers the recycling process. To control the morphology of the material microstructure, an experiment was carried out where ultrasonic vibration was applied to the melt during solidification. Aluminum-Silicon-Iron alloys containing 4 mass% iron were melted and solidified. The primary crystals that formed from the melts were intermetallic compounds that were identified as Al 3 Fe, -AlSiFe (Al 7:4 SiFe 2 ) and -AlSiFe (Al 9 Si 2 Fe 2 ). The refinement of these intermetallic compounds was thought to occur with the application of ultrasonic vibration. Accurate results were obtained when the vibration was applied at the liquidus temperature. The liquidus temperatures of the Al-615Si-4Fe alloys were in the range of 945 to 955 K regardless of the silicon content and that of the Al-18Si-4Fe alloy was 977.2 K.Coarse plate-like intermetallic compounds formed in Al-6 mass%Si-4 mass%Fe and Al-12 mass%Si-4 mass%Fe alloys, which can be refined by the application of ultrasonic vibration on crossing the liquidus temperature on cooling. The coarse columnar structure of an Al-18 mass%Si-4 mass%Fe alloy was modified to a fine grained structure.
ȴɱɁɝɴʀȷȡ᧸ǓǮɒɖ᳒୧⓹۰ቦᄦǽ⓯ׅࢯ⇠ᑰɿ݅డɿڢ᎓ ᆨɿগߵᆒ ᢼɿቦᄦᮾ᳣ᑿᐦȰȻɦɎɲȪɳᮾ᳣Ƀɻɇʀࢫ305-0047 ⇹᭔dzǞǿల٣ᥰ 1-2-1 A simple process for fabricating aénano-laminarêceramic composite was examined. Glass flakes with a thickness of 0.7 mm coated with silver were used as model materials, and were consolidated by pulsed current sintering with a uniaxial press of 7.1 MPa. The sintering temperature was varied in the range of 873-973 K. The consolidated samples sintered at 943 K were fairly dense, and the flakes were aligned by uniaxial pressing. The silver coating remained on the flakes through the sintering, and became an interface layer between the flakes. The indentation test demonstrated its high resistance to crack propagation through the transverse direction of the aligned flakes; this result was attributed to crack deflection at the interface and the accumulation of microfractures around the indent. The potential for a nano-laminar composite with high toughness were shown.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.