摘要
利用高温X射线衍射研究了纯Cu,纯Al,Cu75Al25,Cu71Al25Ni4(原子分数,%)液态结构,获得了结构因子。研究结果表明:纯Cu和纯Al熔体结构因子主峰前曲线均呈光滑的抛物线状;而Cu75Al25熔体的结构因子曲线主峰前则出现预峰;加入Ni后,即Cu71Al25Ni4熔体的结构因子曲线上预峰明显增强。根据预峰的特性,提出两液态结构的原子模型,即由八面体结构共享顶点形成的原子团簇与无规密堆积原子分布区域组成。
The liquid structure of pure Cu, pure Al,Cu75Al25 and Cu71Al25Ni4 alloys (with at%) were investigated with a theta-theta diffractometer and their structure factors were obtained in this paper. The experimental results showed that in front of the main peaks on the melt structure factors, the X-ray pattern curves take parabola shape for the pure Al and Cu and have a distinct pre-peak for the molten Cu75Al25, whose intensity increases by adding of Ni (Cu71Al25Ni4). According to the characteristics of pre-peaks, an atomic model can be proposed for the liquid CuAlNi consisting of the octahedrons with shared vertexes and random dense atom distribution region.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2003年第7期494-497,共4页
Rare Metal Materials and Engineering
基金
国家自然科学基金(50071028)
大连理工大学留校人员科研启动基金资助项目
