Glass formation adjacent to the intermetallic compounds in Cu-Zr binary system  

作　　者：Yinxiao Wang Jiahao Yao Yi Li 

机构地区：[1]Shenyang National Laboratory for Materials Science, Institute of Metal research, Chinese Academy of Sciences

出　　处：《Journal of Materials Science & Technology》2018年第4期605-612,共8页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No.51471165);the National "1000 Talent Plan" of China

摘　　要：On the contrary to the common belief that glass formation is unfeasible near terminal intermetallic com- pound due to fast crystallization kinetics, here we present our findings that bulk metallic glasses are readily formed near intermetallic compounds, far away from the traditional region of glass forming near eutectics. While the intermetallic compounds themselves are not possible glass formers, bulk metallic glasses can be quenched compositionally neighboring the intermetallic compounds as close as 0.5 at.%. Taking binary Cu-Zr as a model system, the phenomenon of two optimum glass forming compositions sandwiching the corresponding intermetallic compounds （Cu51 Zr14, CU10Zr7, CuZr, CuZr2 and Cu8Zr3） is observed consistently. This new scenario of＂intermetallic glass＂ is verified by the thermodynamic princi- ple that the alloy liquids neighboring the intermetallic compounds possess lower Gibbs free energy than that of the compounds themselves. Furthermore, the sluggish crystallization behavior of these liquids provides an additional kinetic explanation.On the contrary to the common belief that glass formation is unfeasible near terminal intermetallic com- pound due to fast crystallization kinetics, here we present our findings that bulk metallic glasses are readily formed near intermetallic compounds, far away from the traditional region of glass forming near eutectics. While the intermetallic compounds themselves are not possible glass formers, bulk metallic glasses can be quenched compositionally neighboring the intermetallic compounds as close as 0.5 at.%. Taking binary Cu-Zr as a model system, the phenomenon of two optimum glass forming compositions sandwiching the corresponding intermetallic compounds （Cu51 Zr14, CU10Zr7, CuZr, CuZr2 and Cu8Zr3） is observed consistently. This new scenario of＂intermetallic glass＂ is verified by the thermodynamic princi- ple that the alloy liquids neighboring the intermetallic compounds possess lower Gibbs free energy than that of the compounds themselves. Furthermore, the sluggish crystallization behavior of these liquids provides an additional kinetic explanation.

关 键 词：Metallic glass INTERMETALLIC Glass forming ability Crystallization kinetics 

分 类 号：TG111[金属学及工艺—物理冶金]