摘要
用X光衍射和透射电镜研究证实快速凝固Al88sCe2Ni7Fe3非晶铝合金晶化过程中的初期阶段为初生型晶化。初生相α－Al的结晶体积分数和纳米晶体尺寸随退火温度的升高表现出非同步增长行为：前者逐渐增加而后者变化不明显。不同退火态样品的小角X光散射结果表明，非晶基体中不断析出的纳米晶α－Al粒子，由开始的低温稀疏分布转向高温密集分布。根据实验结果，分析和讨论初生相α－Al的体积分数、晶粒数目、粒子尺寸及粒子分布在初生型晶化过程中的变化规律，为纳米晶α－Al粒子强化非晶基体提供了清晰的物理图像。
The early stage in the crystallization process of rapidly solidified Al88Ce2Ni7Fe3 amorphous aluminum alloy found by X-ray diffraction and transmission electron microscopy is a primary crystallization. The variation of volume fraction and partic1e size of nanocrystalline α-Al exhibit different behaviour:the former increases gradually and the latter keeps almost unchanged. From small angle X-ray scattering results of different annealed samples, it is concluded that nanocrystalline α-Al particles precipitated in the amorphousmatrix occur transformation of rare distribution at low temperature to concentrated distribution at high temperature- According to these results, the characteristics of volume fraction, grain number, particlesize and particle distribution of α-Al in the primary crystallization process have been analysed and dis-cussed, which provides a physical view for α-Al strengthening in the amorphous matrix.
出处
《航空材料学报》
EI
CAS
CSCD
1997年第2期14-19,共6页
Journal of Aeronautical Materials
基金
航空科学基金
博士后科学基金
关键词
快速凝固
非晶铝合金
初生型晶化
纳米晶体
rapid solidification,amorphous aluminum alloy, primary crystallization, nanocrystallite
