U-Cr Binary Alloys with Anomalous Glass-Forming Ability

doi:10.11900/0412.1961.2016.00275

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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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 (T_rx) 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)

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	Huogen HUANG
	Hongyang XU
	Pengguo ZHANG
	Yingmin WANG
	Haibo KE
	Pei ZHANG
	Tianwei LIU

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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]

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; T_x—crystallization temperature; T_p1 and T_p2—first and second phase transformaion peaks, respectively; T_m—melting temperature; T_L—liquidus temperature; ΔH₁ and ΔH₂—phase transformation enthalpy; ΔH_m—melting enthalpy)

Table 2 Thermodynamic parameters of U-Cr amorphous alloys

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