(1. 南昌大學(xué) 材料科學(xué)與工程學(xué)院，南昌 330031；
2. 南昌大學(xué) 江西省高性能精確成形重點實驗室，南昌 330031)
摘 要: 采用水冷銅模吸鑄法制備內(nèi)生β-Ti晶體相增塑Ti48Zr18V12Cu5Be17塊體非晶復(fù)合材料，研究該材料在半固態(tài)溫度區(qū)間的顯微組織演變及其動力學(xué)。結(jié)果表明：水冷銅模吸鑄的鑄態(tài)組織和半固態(tài)等溫處理后的水淬組織均由β-Ti晶體相和基體非晶相組成。半固態(tài)等溫處理溫度和保溫時間決定著β-Ti相的最終形態(tài)，提高等溫處理溫度將提高β-Ti相的演變速度。β-Ti相晶粒尺寸D3和保溫時間t存在線性關(guān)系，生長動力學(xué)因子K=3.6 μm3/s，β-Ti相的球化過程是由溶質(zhì)元素擴散控制的粗化行為。
關(guān)鍵字: 非晶基復(fù)合材料；半固態(tài)；水冷銅模；顯微組織
（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
