摘要
为了进一步认识U合金体系的非晶形成规律,探究了U-Rh体系的非晶形成特性。在富U端共晶区65%~80%U(原子分数)范围内设计了系列U-Rh合金,通过真空电弧熔炼制备母锭样品与甩带技术制备条带样品,采用X射线衍射和热分析手段研究了2种样品的相组成与热行为。发现U_(70)Rh_(30)合金在急冷凝固条件下形成了部分非晶相,晶化温度为642 K,晶化激活能接近200 kJ/mol,与之共生的是γ-U高温固溶体相,这是U基非晶合金通过急冷冻结高温U固溶体的首次证据,反映出U-Rh合金非平衡凝固相变行为的独特性。结果表明,U-Rh是一个新的铀基非晶合金体系,其非晶形成能力不强,这很可能与γ-U高温固溶体能被急冷直接捕获有关。
In order to further understand glass forming rules of uranium alloy systems,the characteristics of glass formation in U-Rh system were studied.A series of U-Rh alloys with 65at%-80at%U were designed in the U-rich eutectic zone,and then shaped into ingot samples by vacuum arc melting and into ribbon samples by melt-spinning.Their phase constitutions and thermal behaviors were studied by XRD and thermal analysis.It is found that upon rapid solidification,partial amorphous phase is formed in U_(70)Rh_(30)alloy,whose crystallization temperature is 642 K and whose crystallization activation energy is nearly 200 kJ/mol.The coexisting phase is high temperatureg-U solid solution.It is the first evidence of this kind of phase forming in U-based amorphous alloys by rapid quenching,implying unique non-equilibrium solidification phase transformation of U-Rh alloys.It is concluded that U-Rh is a new amorphous alloy system with weak glass forming ability,which is probably relevant to the capability of directly arresting high temperatureg-U solid solution during rapid cooling.
作者
李正飞
韩录会
张培
法涛
黄火根
Li Zhengfei;Han Luhui;Zhang Pei;Fa Tao;Huang Huogen(Institute of Materials,China Academy of Engineering Physics,Jiangyou 621907,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2023年第9期3126-3131,共6页
Rare Metal Materials and Engineering
基金
国家重点研发计划(2021YFA1601100)
基础加强计划(JCJQ20190415)。
关键词
非晶合金
金属玻璃
铀合金
贵金属
amorphous alloy
metallic glass
uranium alloy
noble metal
