Cooling Slope Casting Process for Synthesis of Bulk Metallic Glass Based Composites with Semisolid Structure
Cooling Slope Casting Process for Synthesis of Bulk Metallic Glass Based Composites with Semisolid Structure
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DOI：
10.1007/s11661-010-0202-x
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发表时间：
2010-04
期刊：
影响因子：
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通讯作者：
A. Makaya;T. Tamura;K. Miwa
中科院分区：
文献类型：
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作者：
A. Makaya;T. Tamura;K. Miwa
开发了一种结合冷却斜面铸造和吸力铸造的工艺，以在锆基大块金属玻璃基复合材料中产生半固态结构。将熔体注入冷却斜坡上，随后真空吸入放置在斜坡末端的圆柱形铜模具中。成分为 Zr66.4Nb6.4Cu10.5Ni8.7Al8 的 4 毫米直径样品获得的结构由玻璃基体中球状和玫瑰花状 bcc 晶体的分散体组成。测试了各种坡度角度、坡度长度和注入压力。在短斜面长度和高注射压力下获得了最粗和最球状的晶体结构。微观结构分析表明，斜坡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。半固态结构有望赋予复合材料改进的机械性能和延展性。
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 Zr66.4Nb6.4Cu10.5Ni8.7Al8consists 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.