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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructure Evolution and Mechanical Properties of Ti-6Al-4V Alloy Prepared by Multipass Equal Channel Angular Pressing
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Microstructure Evolution and Mechanical Properties of Ti-6Al-4V Alloy Prepared by Multipass Equal Channel Angular Pressing

机译：多臂等通道角压制制备Ti-6Al-4V合金的微观结构演化与机械性能

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摘要

Multipass ECAP was applied to prepare ultra-fine-grained Ti-6Al-4V alloy. The microstructure evolution and mechanical properties of Ti-6Al-4V alloy during ECAP process were discussed in this study. Grain size of Ti-6Al-4V alloy decreased significantly with the increase in the number of ECAP passes, and numerous grains with size of 200-300 nm were observed in the four-pass ECAP sample. The twinning structure plays an important role in the plastic deformation coordination mechanism, which can be reflected by the gradually increasing twins during multipass ECAP process. Moreover, the Vickers hardness and room-temperature compression strength increased with the increase in the number of ECAP passes due to the high dislocation density, grain refinement and the large number of twins. The hardness and compression strength increased from 355 HV and 1296 MPa to 392 HV and 1432 MPa, respectively. However, the ultimate strain of the four-pass ECAP sample is even higher than that of the two-pass and three-pass samples because of its uniformly refined microstructure and high twinning density. Uniform microstructure with average grain size of 1-2 mu m was obtained by four-pass ECAP and following annealing treatment at 923 K for 30 min, which indicates that static recrystallization occurs in a relatively low temperature and short time. The compression experiments results show that Ti-6Al-4V alloy prepared by four-pass ECAP and following annealing treatment exhibits high comprehensive properties in both strength and plasticity at room temperature, with corresponding values of 48.8% in ultimate strain and 1400.3 MPa in strength.
机译：施用多脂肪酸以制备超细颗粒Ti-6Al-4V合金。本研究探讨了ECAP过程中Ti-6Al-4V合金的微观结构演化和力学性能。 Ti-6Al-4V合金的晶粒尺寸随着ECAP通过的数量的增加而显着降低，在四递生ECAP样品中观察到尺寸为200-300nm的许多晶粒。孪晶结构在塑性变形协调机构中起重要作用，该机制可以通过逐渐增加的孪晶在多汇款生态过程中反射。此外，由于高位脱位密度，晶粒细化和大量双胞胎，Vickers硬度和室温压缩强度随着ECAP通量的增加而增加。硬度和压缩强度分别从355 HV和1296MPa增加到392 HV和1432MPa。然而，由于其均匀精细的微观结构和高的孪晶密度，四通射肌样品的最终菌株甚至高于双通和三通样品。通过四递生ECAP获得平均晶粒尺寸的均匀微观结构，并在923k下进行退火处理30分钟，表明静态重结晶在相对低的温度和短时间内发生。压缩实验结果表明，通过四递生ECAP和退火处理制备的Ti-6Al-4V合金在室温下的强度和可塑性具有高综合性质，相应的值为48.8％，强度为48.8％，强度为1400.3MPa。

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