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首页> 外文期刊>Materials Science and Engineering >Superplasticity of metastable ultrafine-grained Ti-6242S alloy: Mechanical flow behavior and microstructural evolution
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Superplasticity of metastable ultrafine-grained Ti-6242S alloy: Mechanical flow behavior and microstructural evolution

机译：亚稳态超细Ti-6242S合金的超塑性：机械流动行为和微观结构演变

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Herein we quantitatively clarify the effects of grain size, beta fraction, and morphology on the high-temperature deformation behavior of the Ti-6Al-2Sn-4Zr-2Mo-0.1Si alloy. For this purpose, five materials were subjected to high-temperature tensile deformation: the UFG1 specimen (having an equiaxed morphology with d(alpha) = 0.78 mu m and V-beta = 2.8%), the UFG2 specimen (having an equiaxed morphology with d(alpha) = 0.99 mu m and V-beta = 24.2%), the FG1 specimen (having an equiaxed morphology with d(alpha) = 2.65 mu m and V-beta = 11.2%), the FG2 specimen (having an equiaxed morphology with d(alpha) = 4.12 mu m and V-beta = 11.0%), and the STQ specimen (with an acicular alpha' martensite morphology). The UFG1 specimen is produced by hot-rolling of the STQ specimen having an acicular a' martensite microstructure at 750 degrees C. The UFG2 specimen is prepared by heat treatment of the UFG1 specimen at 400 degrees C. The FG1 specimen is as-received Ti-6242S alloy plate, and the FG2 specimen was prepared by heat treatment of the FG1 specimen at 900 degrees C. The UFG specimens exhibited higher ductility associated with frequent activation of superplasticity than the FG specimens owing to the effect of decreasing grain size. The STQ specimen exhibited higher ductility at 700 degrees C than the FG specimens. Quantitative analysis of the deformation mode according to internal-variable theory revealed much more grain boundary sliding in the UFG specimens. A comparison of the deformation behavior of the UFG1 and UFG2 specimens revealed excellent superplastic ductility in the UFG2 specimen at higher strain rates (10(-3) and 10(-2) s(-1)) and in the UFG1 specimen at lower strain rates (5 x 10(-4) and 10(-4) s(-1)). This behavior is ascribed mainly to different accommodation mechanisms during deformation of these specimens; dynamic beta precipitation from supersaturated alpha microstructure occurred in the UFG1 specimen, whereas a decomposition process in which supersaturated beta precipitates dissolve into the a phase was enhanced in the UFG2 specimen. In addition, the excess beta precipitation observed in the UFG2 specimen led to enhanced alpha/beta grain boundary sliding, resulting in further enhancement of the superplasticity.
机译：本文中，我们定量地阐明了晶粒尺寸，β分数和形态对Ti-6Al-2Sn-4Zr-2Mo-0.1Si合金高温变形行为的影响。为此，对五种材料进行了高温拉伸变形：UFG1样品（dα= 0.78μm，V-beta = 2.8％的等轴形态），UFG2样品（dα= 0.78μm的等轴形态）。 d（alpha）= 0.99μm，V-beta = 24.2％），FG1标本（具有等轴形态，dα= 2.65μm，V-beta = 11.2％），FG2标本（具有等轴） d（α）= 4.12微米，V-beta = 11.0％的样品的形态； STQ标本（呈针状α'马氏体形态）。 UFG1试样是通过在750℃下热轧具有针状马氏体显微组织的STQ试样而制成的。UFG2试样是通过在400℃下对UFG1试样进行热处理而制备的。FG1试样为原样Ti -6242S合金板，并通过在900摄氏度下对FG1试样进行热处理来制备FG2试样。由于晶粒尺寸减小，与FG试样相比，UFG试样具有更高的延展性和超塑性的频繁活化。 STQ样品在700摄氏度时比FG样品具有更高的延展性。根据内部变量理论对变形模式的定量分析表明，UFG试样中的晶界滑动更多。 UFG1和UFG2试样的变形行为的比较表明，在较高应变速率（10（-3）和10（-2）s（-1））下，UFG2试样和较低应变下的UFG1试样均具有出色的超塑性延展性速率（5 x 10（-4）和10（-4）s（-1））。这种现象主要归因于这些样品变形过程中的不同调节机制。 UFG1标本中发生了过饱和α微结构的动态β沉淀，而UFG2标本中的过饱和β沉淀溶解到a相中的分解过程得到了增强。此外，在UFG2样品中观察到的过量β沉淀导致增强的α/β晶界滑动，从而进一步增强了超塑性。

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