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应用电子背散射衍射技术(EBSD)研究TC4钛合金绝热剪切带(ASB)的微观组织及其织构演化。原为等轴组织的小圆柱试样用Gleeble-3500热模拟试验机以相对低的应变速率热压缩获得ASB。结果表明,试样组织由基体、过渡区和ASB组成。基体为等轴α晶粒和晶粒间的β相;过渡区为内部包含亚晶的1~4μm宽的拉长组织;试样中心ASB由0.2~0.7μm的再结晶晶粒组成;接近试样边缘ASB存在剧烈拉长的条状组织、大量的亚晶和再结晶晶粒。极图表明,基体具有较强的{0001}<1010>织构;过渡区包含{1010}<1120>和{1122}<1123>织构;中心ASB没有取向集中;接近试样边缘ASB为{1120}<1010>织构。
Study on Microstructure and Texture Evolution of Adiabatic Shear Band (ASB) of TC4 Titanium Alloy by Electron Backscattered Diffraction (EBSD) Technique. Cylindrical samples, which were originally equiaxed, were ASZ-compressed with a Gleeble-3500 thermal simulator at a relatively low strain rate. The results show that the sample structure consists of matrix, transition zone and ASB. The matrix consists of equiaxed α grains and β phase between the grains. The transition zone is a 1 ~ 4μm wide elongated structure with subgrains inside. The ASB consists of recrystallized grains with 0.2-0.7μm in the sample center. The edge-like ASB has a strongly elongated bar-like structure, a large number of subgrain and recrystallized grains. The polar diagram shows that the matrix has a strong {0001} <1010> texture; the transition contains {1010} <1120> and {1122} <1123> textures; the central ASB has no orientation concentration; the ASB near the sample edge is { 1120} <1010> texture.