摘要
The morphologies, sizes, compositions and volume fractions of dendritic phases in in situ Ti-based metallic glass matrix composites (MGMCs) containing beryllium (Be) with the nominal composition of Tia7Zr19Cu5V12Be17 (mole fraction, %) were investigated using XRD, SEM, EBSD, TEM, EDS and three-dimensional reconstruction method. Moreover, visualized at the nanoscale, Be distribution is confirmed to be only present in the matrix using scanning transmission electron microscopy-electron energy loss spectroscopy (STEM-EELS). Based on these findings, it has been obtained that the accurate chemical compositions are Wi28.3Zr19.7Cu8V6.4Be37.6 (mole fraction, %) for glass matrix and Wi62.nZr18.aCu2.6V16.6 (mole fraction, %) for the dendritic phases, and the volume fractions are 38.5% and 61.5%, respectively. It is believed that the results are of particular importance for the designing of Be-containing MGMCs.
采用XRD、SEM、EBSD、TEM、EDS以及三维组织重构方法系统研究原位Be元素的Ti基非晶复合材料Ti_(47)Zr_(19)Cu_5V_(12)Be_(17)(摩尔分数,%)中晶体相的形态、尺寸、成分和体积分数,并采用STEM-EELS证明Be元素仅仅分布在非晶基体中。在此基础上,准确地得到了晶体相和非晶基体的化学成分分别为Ti_(62.4)Zr_(18.4)Cu_(2.6)V_(16.6)和Ti_(28.3)Zr_(19.7)Cu_8V_(6.4)Be_(37.6)(摩尔分数,%),相应的体积分数分别为61.5%和38.5%,该结果对设计原位含Be非晶复合材料具有重要的指导意义。
基金
Project(11374028)supported by the National Natural Science Foundation of China
Project supported by the Cheung Kong Scholars Program of China