A process combining cooling slope casting and suction casting was developed to generate a semisolid structure in a Zr-based bulk metallic glass matrix composite. The melt was injected onto a cooling slope and subsequently vacuum sucked into a cylindrical copper mold placed at the end of the slope. The structure obtained for 4-mm-diameter specimens of composition Zr_66.4Nb_6.4Cu_10.5Ni_8.7Al₈ consists of a dispersion of spheroidal and rosettelike bcc crystals in a glassy matrix. Various slope angles, slope lengths, and injection pressures were tested. The coarsest and most spheroidal crystal structure was obtained at short slope lengths and high injection pressures. Microstructure analysis suggests that the slope is the location of extensive crystal nucleation and possible fragmentation, while the microstructure’s morphological evolution seems to occur mainly in the mold. The semisolid structure is expected to confer improved mechanical properties and ductility to the composite material.

开发了一种结合了冷却倾斜铸造和吸铸的工艺，以在Zr基块状金属玻璃基复合材料中生成半固态结构。将熔体注入冷却坡道，然后真空吸进放置在坡道末端的圆柱形铜模具中。组成为Zr _66.4 Nb _6.4 Cu _10.5 Ni _8.7 Al _8的4毫米直径试样的结构由球形和玫瑰状bcc晶体在玻璃状基质中的分散体组成。测试了各种斜角，斜率长度和注射压力。在短的斜率长度和高的注射压力下获得了最粗，最球形的晶体结构。微观结构分析表明，斜率是广泛的晶体成核和可能碎裂的位置，而微观结构的形态演变似乎主要发生在模具中。期望半固体结构赋予复合材料改善的机械性能和延展性。