• F F Wu

      Articles written in Bulletin of Materials Science

    • Formation of ternary Mg–Cu–Dy bulk metallic glasses

      X F Wu Y Kang F F Wu K Q Qiu L K Meng

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      The glass-forming ability (GFA) of ternary Mg–Cu–Dy alloys was systematically investigated by using differential scanning calorimetry (DSC) and X-ray diffractometry (XRD) techniques. The results showed that a series of ternary Mg–Cu–Dy bulk metallic glasses (BGMs) with a diameter of 4–8 mm were successfully fabricated in the system with conventional Cu-mold casting method. Mg55Cu32Dy13, Mg60Cu27Dy13, Mg65Cu25Dy10 and Mg70Cu17Dy13 BMGs exhibit a clear glass transition, a broad supercooled liquid region and different crystallization and melting behaviours. They have supercooled liquid region ($\Delta T_{x}$) from 41 K to 65 K, reduced glass transition temperature ($T_{rg}$) from 0.5363 to 0.5974 and 𝛾 parameter from 0.4038 to 0.4136. The 𝛾 shows a relatively good agreement with the GFA of the BGMs. On the other hand, a high fracture compressive strength of 624 MPa was obtained for Mg60Cu27Dy13 BMG.

    • Microstructural evolution and mechanical properties of hypereutectic Al–Si alloy processed by liquid die forging

      F F Wu S T Li G A Zhang F Jiang

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      The microstructural evolution and mechanical properties of a hypereutectic Al–Si alloy processed by liquid die forging were investigated. It is found that the grain size of the primary Si was significantly reduced by liquid die forging with increased pressure. The volume fraction of eutectic silicon was decreased with increased pressure. By liquid die forging with pressure up to 180 MPa, the average size of the primary Si was reduced to about 18 𝜇m, which results in the remarkable increase in the fracture strength and hardness of the hypereutectic Al–Si alloy.

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