U-Cr Binary Alloys with Anomalous Glass-Forming Ability
Received date: 2016-07-01
Online published: 2016-12-14
Supported by
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)
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.
Huogen HUANG , Hongyang XU , Pengguo ZHANG , Yingmin WANG , Haibo KE , Pei ZHANG , Tianwei LIU . U-Cr Binary Alloys with Anomalous Glass-Forming Ability[J]. Acta Metall Sin, 2017 , 53(2) : 233 -238 . DOI: 10.11900/0412.1961.2016.00275
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