Microstructure evolution of Ti_(48)Zr_(27)Cu_(6)Nb_(5)Be_(14)amorphous alloy after semi-solid isothermal treatment  

作　　者：Xin-hua Huang Jing-wen Pu Yong-xin Luo Yue-jun Ouyang 

机构地区：[1]School of Material,Electricity and Intelligent Manufacturing,Huaihua University,Huaihua 330031,Hunan,China [2]Hunan Renewable Aluminum Innovation Research Center,Huaihua University,Huaihua 330031,Hunan,China

出　　处：《China Foundry》2024年第3期287-294,共8页中国铸造（英文版）

基　　金：supported by the Natural Science Foundation of Hunan Province(No.2023JJ50453);the Science Research Excellent Youth Project of Hunan Educational Department(No.22B0777);the Key Scientific Research Project of Hunan Educational Department(No.22A0551);the Key Scientific Research Projects of Huaihua University(No.HHUY2022-13).

摘　　要：The as-cast amorphous Ti_(48)Zr_(27)Cu_(6)Nb_(5)Be_(14)composites,comprising in situ formedβ-Ti ductile crystalline precipitates,were prepared by water cooled copper mold suction casting.Then,the semi-solid composites were obtained after the as-cast composites were treated by semi-solid isothermal treatment.The microstructure evolution and kinetics of the composites were examined.Results show that the microstructures of both the as-cast and semi-solid composites comprise ofβ-Ti crystal phases and amorphous matrix phases.Before and after treatment,the crystals evolve from fine granular or fine dendritic crystals to coarse crystals.As the treatment temperature increasing or the time prolonging,the average crystal size gradually increases and the surface morphology of the crystals gradually becomes regular.By studying the microstructural evolution and dynamics during the isothermal treatment process,it is found that the final morphology ofβ-Ti crystals is influenced by the isothermal treatment temperature and time(t),and theβ-Ti evolution rate increases with an increase in treatment temperature.In addition,a linear relationship was observed between the size of cubicβ-Ti crystals(D^(3))and t;the growth kinetics factor K is 3.8μm^(3)·s^(-1).As the K value closes to 4μm^(3)·s^(-1),it is inferred the morphology evolution ofβ-Ti crystals is a coarsening behavior controlled by the diffusion of solute elements.

关 键 词：Ti_(48)Zr_(27)Cu_(6)Nb_(5)Be_(14) amorphous matrix composites SEMI-SOLID as-cast microstructure 

分 类 号：TG146.23[一般工业技术—材料科学与工程]