Enhanced crystallization resistance and thermal stability via suppressing the metastable superlattice phase in Ni-(Pd)-P metallic glasses  

作　　者：Qing Du Xiongjun Liu Yihuan Cao Yuren Wen Dongdong Xiao Yuan Wu Hui Wang Zhaoping Lu 

机构地区：[1]Beijing Advanced Innovation Center for Materials Genome Engineering,State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China [2]School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China [3]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Journal of Materials Science & Technology》2020年第7期203-211,共9页材料科学技术（英文版）

基　　金：This research was supported by the National Natural Science Foundation of China(Nos.51871016,51671021,51671018,51531001 and 11790293);111 Project(B07003);the Program for Changjiang Scholars and Innovative Research Team in University(IRT_14R05);the Projects of SKL-AMM-USTB(2018Z-01,2018Z-19).H.W.would like to thank the financial support from the Fundamental Research Fund for the Central Universities of China(No.FRF-TP-18-004C1).

摘　　要：Virtually,glass formation is to avoid crystallization during solidification,i.e.,a consequence of the competition between the undercooled liquid and primary crystalline phases.It is found that the crystallization resistance of the binary Ni-P system was drastically enhanced with alloying of Pd and correspondingly,the critical size for glass formation increased significantly from the micrometer to millimeter scale.Thermodynamically,the introduction of Pd could effectively increase the atomic size mismatch and heat of mixing,which are beneficial to stabilize the supercooled liquid.Kinetically,the introduction of Pd not only successfully suppresses the formation of metastable superlattice phase,which is prone to nucleation and growth in the supercooled liquid state,but also changes the crystallization mechanism from the primary to eutectic mode.The current finding sheds light on understanding glass formation of the most studied Pd-Ni-P system and the glass-forming ability in general.

关 键 词：Metallic glass Glass-forming ability Thermal stability NANOCRYSTALLIZATION Metastable superlattice phase 

分 类 号：TG139.8[一般工业技术—材料科学与工程]