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Ultrafine Grain Formation in a Ti-6Al-4V Alloy by Thermomechanical Processing of a Martensitic Microstructure

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Abstract

In the current study, ultrafine equiaxed grains with a size of 150 to 800 nm were successfully produced in a Ti-6Al-4V alloy through thermomechanical processing of a martensitic starting microstructure. This was achieved through a novel mechanism of grain refinement consisting of several concurrent processes. This involves the development of substructure in the lath interiors at an early stage of deformation, which progressed into small high-angle segments with increasing strain. Consequently, the microstructure was gradually transformed to an equiaxed ultrafine grained structure, mostly surrounded by high-angle grain boundaries, through continuous dynamic recrystallization. Simultaneously, the supersaturated martensite was decomposed during deformation, leading to the progressive formation of beta phase, mainly nucleated on the intervariant lath boundaries.

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Acknowledgments

This research was supported by grants through the Australian Research Council including an ARC Laureate Fellowship (P.D.H.).

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Correspondence to Hossein Beladi.

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Manuscript submitted July 12, 2013.

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Chao, Q., Hodgson, P.D. & Beladi, H. Ultrafine Grain Formation in a Ti-6Al-4V Alloy by Thermomechanical Processing of a Martensitic Microstructure. Metall Mater Trans A 45, 2659–2671 (2014). https://doi.org/10.1007/s11661-014-2205-5

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