摘要
用X射线衍射和电子背散射衍射技术,测试了航空用不同规格TA18钛合金管材的织构,并利用织构测试的数据计算了管材的CSR值。由不同规格TA18钛合金管材的(0002)面极图可以得出,管材内部晶粒基面的c轴主要分布在试样RD-TD面内,且沿着ND方向偏转了约30°左右,大部分分布在0～60°的范围之内。利用极图数据所计算的管材的Kearns系数显示,各种规格管材的fr值约为0.6左右,而ft与fl相对较小。同时结合EBSD测试结果,阐述了晶粒形貌与织构产生的原因,对比分析了管材Φ6 mm×0.5 mm横截面与展开面晶粒取向分布特点,结果显示,管材经过多道次的轧制变形,晶粒沿着轧制方向被拉长,试样内部晶粒也出现了明显的择优取向,其中晶粒c轴主要沿ND方向分布,形成了较强的(0002)基面织构。通过EBSD测试方法得到的CSR值与极图计算值和实测值得到的结果相近,因此极图法是一种测试钛合金管材织构的有效方法。
The texture of TA18 titanium alloys tubes was studied by means of X-ray diffraction and electron backscattered diffraction（EBSD）,the CSR values were calculated too.The results of（0002） pole figures for different types of TA18 titanium alloys tubes showed that the c-axis of the grains distributed in the plane of RD-TD and deflected 30° from the ND direction,most of which scattered at the range of 0~60°.The Kearns factors of different types of TA18 titanium alloys tubes showed that fr was about 0.6 while ft and fl was relatively small.The results of EBSD showed that the preferred orientation of the grains in the Φ6 mm×0.5 mm TA18 titanium alloys tube was observed,after passes of rolling,the grains were stretched along the rolling direction.The c-axis of the grains paralleled to the ND direction and formed basal（0002） texture.Besides,the method of calculating CSR values was an effective way to measure the texture of TA18 titanium alloys tubes,the results matched the EBSD value and tested value very well.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2011年第6期928-933,共6页
Chinese Journal of Rare Metals
基金
中国博士后科学基金(20100470260)
国家重点基础研究发展计划(2010CB735811)项目资助
