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中文摘要：
本文利用电子背散射衍射（EBSD）技术，研究了高温热暴露对SiC纤维增强Ti-6A1—4V复合材料基体织构的影响。结果表明，相对于制备态复合材料较为集中的晶粒取向，900℃10h热暴露后的复合材料其晶粒生长的方向既有基面方向，又有棱面方向，同时还存在锥面方向。随着热暴露时间的延长，900℃75h热暴露的复合材料基面方向的生长方式与900℃10h热暴露的复合材料情况恰好相反。另外，无论是基面方向还是棱面方向，随着热暴露时间的延长，晶粒生长的取向均有向单一取向演化的趋势，且锥面方向上的生长会逐渐消失。
英文摘要：
The effect of the thermal exposure on the texture of matrix in the SiC fiber reinforced Ti-6Al-4V alloy composite was investigated by using electron back-scatter diffraction （ EBSD）. The results show that compared to the relative concentrated orientation of grains in as-processed composite, all of the basal, prismatic and pyramidal orientations of grains exist in the composite thermally exposed at 900℃ for 10 h. And with increasing of the thermal exposure time, the growth manner of basal orientation of grains in the composite thermally exposed at 900℃ for 75 h is opposite to that in the composite thermally exposed at 900℃ for 10h. Furthermore, with increasing the thermal exposure time, both basal and prismatic orientations of grains show an evolution trend of a single orientation respectively. And the pyramidal orientation disappears gradually.
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