半固态等温处理Ti_(48)Zr_(18)V_(12)Cu_5Be_(17)非晶合金的显微组织演变  

Microstructure evolution of Ti_(48)Zr_(18)V_(12)Cu_5Be_(17) bulk metallic glass matrix composite during isothermal holding at semi-solid stage

作　　者：郭洪民[1,2] 王程[1] 温飞马 杨湘杰[2] 章爱生[2] 

机构地区：[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

出　　处：《中国有色金属学报》2016年第10期2110-2117,共8页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(11364031);江西省青年科学家资助计划资助项目(20122BCB23001);江西省自然科学基金重点项目(20133ACB21003);教育部科技重点项目(212091)~~

摘　　要：采用水冷铜模吸铸法制备内生β-Ti晶体相增塑Ti_(48)Zr_(18)V_(12)Cu_5Be_(17)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D^3和保温时间t存在线性关系,生长动力学因子K=3.6μm^3/s,β-Ti相的球化过程是由溶质元素扩散控制的粗化行为。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 μm^3/s.

关 键 词：非晶基复合材料 半固态 水冷铜模 显微组织 

分 类 号：TG146.1[一般工业技术—材料科学与工程] TG249.9[金属学及工艺—金属材料]