通过进动电子衍射（PED）和XRD研究三阶段CVD SiC纤维的局部织构
Local texture of three-stage CVD SiC fibre by precession electron diffraction (PED) and XRD
AI总结：
本研究采用XRD和TEM下的PED方法表征三阶段CVD SiC纤维的局部织构，明确各沉积阶段的晶粒取向、尺寸演化规律，证实轴向[110]择优取向利于提升纤维轴向拉伸强度。
摘要：
具有横向各向同性特性的SiC纤维对其增强金属基复合材料至关重要。本文采用X射线衍射（XRD）和透射电子显微镜（TEM）下的进动电子衍射（PED）方法，研究了化学气相沉积（CVD）SiC纤维的局部织构。XRD结果与PED所得结果一致。结果表明，在沉积第一阶段，SiC晶粒的择优取向几乎是随机的，晶粒尺寸分布分散。在沉积第二和第三阶段，SiC纤维中存在两种织构，即(110)<111>和(110)<115>。此外，第二和第三阶段的晶粒尺寸约为200 nm，由于第三阶段温度更低，第三阶段的晶粒尺寸小于第二阶段。SiC纤维沿轴向的[110]择优取向有利于其轴向拉伸强度。
英文摘要：
SiC fibre with the transverse isotropic properties is very important to it reinforced metal matrix composites. In this paper, local texture of the CVD SiC fibre was investigated by means of X-ray diffraction (XRD) and precession electron diffraction (PED) on transmission electron microscopy(TEM). The result from XRD is in agreement with the result obtained from PED. And the result shown that at the first stage of deposition, the preferred direction of SiC grains is almost random and the distribution of grain size is scattered. At the second and third stages of deposition, there are two kinds of texture in SiC fibre, that is, (110),111. and (110),115.. Furthermore, the grain size at the second and third stages is about 200 nm and it is lower at the third stage than at the second stage because of the lower temperature at the third stage. The [110] preferred direction along axial direction for SiC fibre is beneficial to the axial tensile strength.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
