(1. 南昌大学 材料科学与工程学院，南昌 330031；
2. 南昌大学 江西省高性能精确成形重点实验室，南昌 330031)
摘 要: 采用水冷铜模吸铸法制备内生β-Ti晶体相增塑Ti48Zr18V12Cu5Be17块体非晶复合材料，研究该材料在半固态温度区间的显微组织演变及其动力学。结果表明：水冷铜模吸铸的铸态组织和半固态等温处理后的水淬组织均由β-Ti晶体相和基体非晶相组成。半固态等温处理温度和保温时间决定着β-Ti相的最终形态，提高等温处理温度将提高β-Ti相的演变速度。β-Ti相晶粒尺寸D3和保温时间t存在线性关系，生长动力学因子K=3.6 μm3/s，β-Ti相的球化过程是由溶质元素扩散控制的粗化行为。
关键字: 非晶基复合材料；半固态；水冷铜模；显微组织
（1. School of Materials Science and Engineering, Nanchang University, Nanchang 330031, China;
2. Key Lab of Near-Net Forming in Jiangxi Province, Nanchang University, Nanchang 330031, China）
Abstract:The Ti48Zr18V12Cu5Be17 in-situ bulk metallic glass matrix composite (BMGC) was prepared by copper mould suction process, and the evolution of microstructure of this kind of Ti based BMGC at semi-solid stage was investigated. The results show that microstructures of billets, produced by copper mould suction and water quenching after isothermal holding at semi-solid stage, mainly contain β-Ti phase and glass matrix. Isothermal holding temperature and time interval determine the final morphology of β-Ti phase, and the increasing of isothermal holding temperature increases microstructure evolution rate. A linear relationship between the cube grain size of β-Ti phase and isothermal holding time is found, and the value of coarsening rate is 3.6 μm3/s.
Key words: metallic glass matrix composite; semi-solid state; copper mould suction; microstructure
