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Load Relaxation Behavior of Ultra-fine Grained Ti-6AI-4V Alloy

机译:超细晶粒Ti-6AI-4V合金的载荷松弛行为

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In this study, superplastic deformation behavior of ultrafine-grained Ti-6Al-4V alloy was investigated on the basis of the inelastic deformation theory which consists of grain matrix deformation and grain boundary sliding. Specimens with coarse equiaxed grains (11μm in diameter) were significantly refined (≈0.3μm in diameter) with high angle boundaries after 4 times of isothermal equal channel angular (ECA) pressing at 600℃. Load relaxation test was performed at 600 ~ 700℃ to enlighten the deformation mechanisms operating at specific temperature and to find optimum superplastic forming conditions for ultrafine-grained structures. Main efforts were devoted to analyze quantitatively the relative amount of each deformation mode, i.e., dislocation glide and grain boundary sliding operating at specific temperature.
机译:本研究基于非弹性变形理论,研究了Ti-6Al-4V超细晶粒Ti-6Al合金的超塑性变形行为,该理论由晶格变形和晶界滑动组成。在600℃等温等通道角(ECA)压了4倍后,粗的等轴晶粒(直径11μm)的试样被高角度边界的试样精制(直径约0.3μm)。在600〜700℃进行了载荷松弛试验,以启发特定温度下的变形机理,并为超细晶粒结构找到最佳的超塑性成形条件。主要努力致力于定量分析每种变形模式的相对量,即在特定温度下运行的位错滑移和晶界滑动。

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