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首页> 外文期刊>Journal of Materials Engineering and Performance >Adiabatic Shear Bands in Ti-6Al-4V Alloy with Lamellar Microstructure
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Adiabatic Shear Bands in Ti-6Al-4V Alloy with Lamellar Microstructure

机译：层状Ti-6Al-4V合金的绝热剪切带

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摘要

Adiabatic shear band (ASB) is an important material's phenomenon often observed in metals when processed at high strain rates. The microstructure and microtexture of ASBs in Ti-6Al-4V alloy with lamellar microstructure deformed by the dynamic loads were investigated by means of Light Microscope, Scanning Electron Microscopy/Electron Back-Scattered Diffraction, and Transmission Electron Microscopy. Close to the boundary of the shear band, highly elongated subgrains with thick cell walls were observed. The core of ASB consists of very fine equiaxed grains with low density of dislocations. New phases are generated in the core of shear band. According to the orientation distribution, the textures in the core of ASB peaked at (45°,5°,0°), (89°,29°,0°), (15°,10°,30°), and (75°,5°,30°); and the grain boundaries in ASB are geometrical necessary boundaries with high angles. Calculations of temperature rise suggest that the temperature in ASB is above the recrystallization point. Finally, the formation of an ASB in the Ti-6Al-4V alloy and its microstructure evolution are described as a consequence of the rotational dynamic recrystallization.
机译：绝热剪切带（ASB）是一种重要的材料现象，在高应变速率下加工时通常会在金属中观察到。利用光学显微镜，扫描电子显微镜/电子背散射衍射和透射电镜研究了动态载荷使Ti-6Al-4V合金具有层状组织变形的ASB的组织和显微组织。靠近剪切带的边界，观察到高度细长的亚晶粒，壁厚厚。 ASB的核心由位错密度低的非常细的等轴晶粒组成。在剪切带的核心产生新的相。根据方向分布，ASB核心的纹理在（45°，5°，0°），（89°，29°，0°），（15°，10°，30°）和（ 75°，5°，30°）; ASB中的晶界是大角度的几何必要边界。温升的计算表明，ASB中的温度高于重结晶点。最后，由于旋转动态再结晶，描述了在Ti-6Al-4V合金中ASB的形成及其微观结构的演变。

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