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Acta Metall Sin  2017, Vol. 53 Issue (2): 233-238    DOI: 10.11900/0412.1961.2016.00275
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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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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.

Key words:  amorphous alloy      uranium alloy      glass-forming ability      rapid solidification     
Received:  01 July 2016     
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)

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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https://www.ams.org.cn/EN/10.11900/0412.1961.2016.00275     OR     https://www.ams.org.cn/EN/Y2017/V53/I2/233

Fig.1  U-Cr alloy phase diagram (The colorful zone for alloy design) [16]
Alloy Composition Phase constitution
No. Ingot sample Ribbon sample
1 U67Cr33 α-(U, Cr) + bcc-Cr Amorphous+minor crystalline
2 U69.2Cr30.8 α-(U, Cr) + bcc-Cr Amorphous
3 U73Cr27 α-(U, Cr)+ bcc-Cr Amorphous
4 U75Cr25 α-(U, Cr) + bcc-Cr Amorphous
5 U81Cr19 α-(U, Cr) + bcc-Cr Nanocrystalline
Table 1  Numbers, compositions (atomic fraction, %) and phase constitution of U-Cr alloys
Fig.2  XRD spectra of U-Cr alloy ingots
Fig.3  XRD spectra of U-Cr alloy ribbons
Fig.4  DSC curves of the crystallization (a) and melting behavior (b) of U-Cr ribbon samples (Heating rate is 20 K/min; Tx—crystallization temperature; Tp1 and Tp2—first and second phase transformaion peaks, respectively; Tm—melting temperature; TL—liquidus temperature; ΔH1 and ΔH2—phase transformation enthalpy; ΔHm—melting enthalpy)
Alloy Tx / K Tp1 / K Tp2 / K Tm / K TL / K Tm-Tx / K Tx / TL
U67Cr33 686 935 1034 1140 1154 454 0.594
U69.2Cr30.8 699 939 1034 1140 1154 441 0.606
U73Cr27 690 939 1033 1141 1152 451 0.599
U75Cr25 680 938 1033 1141 1154 461 0.589
U81Cr19 649 935 1034 1141 1156 492 0.561
Table 2  Thermodynamic parameters of U-Cr amorphous alloys
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