具有反常非晶形成能力的U-Cr二元合金  

U-Cr Binary Alloys with Anomalous Glass-Forming Ability

作　　者：黄火根[1] 徐宏扬[1] 张鹏国[1] 王英敏[2] 柯海波[1] 张培[1] 刘天伟[1] 

机构地区：[1]中国工程物理研究院材料研究所,江油621907 [2]大连理工大学材料科学与工程学院三束材料改性教育部重点实验室,大连116024

出　　处：《金属学报》2017年第2期233-238,共6页Acta Metallurgica Sinica

基　　金：国家自然科学基金No.51501169;国防基础预研项目No.B1520133007;中国工程物理研究院科技发展基金项目Nos.2013A0301015和2014B0302047~~

摘　　要：基于共晶法则在U-Cr体系中深共晶点U_(81)Cr_(19)靠Cr一侧设计系列二元合金。在甩带条件下,合金形成单一的非晶相,其初始晶化温度Tx接近700 K,约化晶化温度Trx接近0.6。U-Cr体系的强非晶形成能力不符合在热力学、动力学和结构密堆角度上的预测,显示出一定的反常性,为进一步认识锕系非晶提供了潜在的基础模型体系。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.

关 键 词：非晶合金 铀合金 非晶形成能力 快速凝固 

分 类 号：TG13[一般工业技术—材料科学与工程]