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Effect of Initial Microstructure on Grain Refinement and Enhanced Low Temperature Superplaticity in Friction Stir Processed Ti-6Al-4V Alloy

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Abstract:

Ti-6Al-4V alloy sheet with two kinds of initial microstructure (base material (BM) and heat-treated material) was subjected to friction stir processing (FSP). These two kinds of friction stir processed (FSPed) materials show similar characteristics that the microstructure exhibited equiaxed ultrafine-grained (UFG) structure with high fraction of high angle grain boundaries (HAGBs) and random crystallographic orientations. Furthermore, slightly finer grains were observed in FSPed heat-treated material than that in FSPed BM. Superplastic tensile tests were conducted utilizing the FSPed heat-treated material in the strain rates range from 1×10-2 to 1×10-4 s-1 at 650°C, and the optimal superplasciticy with an elongation of 1220% was achieved at 1×10-3 s-1. The superplastic deformation mechanism appears to be grain boundary sliding.

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Periodical:

Defect and Diffusion Forum (Volume 385)

Pages:

189-194

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.385.189

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Online since:

July 2018

Authors:

Wen Jing Zhang, Hua Ding*, Wen Jing Yang, Ji Zhong Li

Keywords:

Friction Stir Processing, High Angle Grain Boundaries, Low-Temperature Superplasticity, Ti-6Al-4V Alloy

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© 2018 Trans Tech Publications Ltd. All Rights Reserved

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