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U-Cr Binary Alloys with Anomalous Glass-Forming Ability |
Huogen HUANG1(),Hongyang XU1,Pengguo ZHANG1,Yingmin WANG2,Haibo KE1,Pei ZHANG1,Tianwei LIU1 |
1 Institute of Materials, China Academy of Engineering Physics, Jiangyou 621907, China 2 Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China |
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Cite this article:
Huogen HUANG,Hongyang XU,Pengguo ZHANG,Yingmin WANG,Haibo KE,Pei ZHANG,Tianwei LIU. U-Cr Binary Alloys with Anomalous Glass-Forming Ability. Acta Metall Sin, 2017, 53(2): 233-238.
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Abstract As for actinide metallic glasses, a minor branch of metallic glasses, almost all of them are binary alloys and their glass-forming rule has been insufficiently studied. Considering that binary alloy systems are the base of ternary or more component glass systems that possess better glass-forming ability, binary glass systems U-Fe, U-Co and U-Cr are chosen for study. After earlier investigation on the first two systems, the glass formation in U-Cr system is explored in this work. According to the eutectic criterion, a series of U-Cr alloys were designed at the Cr-side of the eutectic point U81Cr19. Under the preparation of melt-spinning, these alloys can be formed into a single amorphous phase with the capacity of crystallizing at about 700 K. The reduced crystallization temperature (Trx) of some U-Cr alloys exceeded 0.6, higher than those of U-Fe and U-Co metallic glasses, and comparable to those of ordinary bulk amorphous alloys. Being inconsistent with the prediction based on thermodynamics, kinetics and efficient structural packing, U-Cr alloy system shows anomalous strong glass-forming ability among reported actinide binary glasses. This abnormal behavior might be related to the existence of comparatively more mediate metastable phases in U-Cr system, which can be speculated from the multi-peak crystallization phenomenon. This system could be a potential system model for studying the glass formation of actinide amorphous alloys further.
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Received: 01 July 2016
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Fund: Supported by National Natural Science Foundation of China (No.51501169), National Defense Basic Scientific Research (No.B1520133007), and Scientific and Technological Development Foundation of China Academy of Engineering Physics (Nos.2013A0301015 and 2014B0302047) |
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