微合金化对U-Co金属玻璃形成能力的影响  

Effect of Minor Alloying on the Glass Forming Ability of U-Co Alloy

作　　者：黄火根[1] 柯海波[1] 刘天伟[1] 张鹏国[1] 唐县娥[1] 王英敏[2] Huang Huogen1, Ke Haibo1, Liu Tianwei1, Zhang Pengguo1, Tang Xiane1, Wang Yingmin2(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）, Dalian University of Technology, Dalian 116024, China)

机构地区：[1]中国工程物理研究院材料研究所,四川江油621907 [2]大连理工大学三束材料改性教育部重点实验室,辽宁大连116024

出　　处：《稀有金属材料与工程》2018年第3期990-994,共5页Rare Metal Materials and Engineering

基　　金：国防基础预研项目(B1520133007);中国工程物理研究院科技发展基金(2013A0301015)

摘　　要：U-Co系具有较宽非晶成分区间,但其玻璃形成能力(GFA)较差。针对该体系的U_(69.2)Co_(30.8)合金,选择不同类型的元素M(M=Sn,Si,Be,Cu,Pd,Y,Zr)进行微合金化,采用铜辊甩带方法制备U_(69)Co_(30)M_1非晶合金条带样品,结合X射线衍射与差示扫描量热技术研究了微合金化对合金GFA的影响。结果表明,Sn添加对U-Co合金的GFA具有明显改善作用,Si次之,Be、Cu影响不大,Pd、Y、Zr起到恶化效果。结合合金熔化行为的改变和GFA与M元素的熔点、电负性、原子尺寸及M-C混合焓等参数的关联性分析,初步揭示出微合金化对U-Co合金GFA的影响机制,其本质应该与改变合金液体稳定性和晶化驱动力有关。Minor alloying is a useful approach for promoting glass forming ability（GFA） of metallic glasses. U-Co metallic glasses can be achieved in a wide amorphous composition range, but their GFAs are very poor. This study is aimed to increase the GFA in U-Co system by minor alloying. Sn, Si, Be, Cu, Pd, Y and Zr were selected as different-typed minor alloying elements in U69.2Co30.8 alloy. The glassy U69Co30M1（M=Sn, Si, Be, Cu, Pd, Y, Zr） ribbon samples were prepared by melt-spinning with a copper roller, and their phase formation and thermodynamics were investigated by X-ray diffraction（XRD） and differential scanning calorimetry（DSC） techniques. The results indicate that Sn element significantly improves the GFA of U-Co alloy, Si displays the second improvement, Be and Cu are slightly effective while Pd, Y and Zr deteriorate the GFA. Based on the combination of the melting behavior change reflected by the DSC result, and the relationship between the GFA and the melting temperatures, electro-negativities, atomic sizes of M elements as well as mixing-enthalpies of M-C, the effect of the minor alloying on the GFA in U-Co system should be attributed to the variation of both metallic liquid stability and the crystallization driving force.

关 键 词：金属玻璃 玻璃形成能力 微合金化 铀合金 

分 类 号：TG146.8[一般工业技术—材料科学与工程]