Journal article
Microstructure evolution and mechanical behavior of ultrafine Ti-6Al-4V during low-temperature superplastic deformation
Times Cited: 8

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ACTA MATERIALIA
Publication Details
Author list: Zherebtsov SV, Kudryavtsev EA, Salishchev GA, Straumal BB, Semiatin SL
Publisher: Elsevier
Publication year: 2016
Volume number: 121
Start page: 152
End page: 163
Number of pages: 12
ISSN: 1359-6454
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Abstract
The influence of microstructure evolution on the low-temperature superplasticity of ultrafine Ti-6Al-4V was established. For this purpose, the static and dynamic coarsening response and plastic-flow behavior of the alloy with a mean size of alpha (sub)grains and beta particles of 0.1-0.4 mu m were determined via a series of tension tests at temperatures between 450 and 700 degrees C. Both static and dynamic coarsening exhibited diffusion-controlled (r(3)-vs-time) kinetics. However, dynamic coarsening was approximately two orders of magnitude faster than the corresponding static behaviors due to enhanced diffusion through the deformed beta matrix. A total elongation of 1000% and strain-rate-sensitivity exponent m = 0.48 were obtained at 550 degrees C and 2 x 10(-4) s(-1). Very limited cavitation was observed in the specimens after superplastic deformation under optimal conditions. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Keywords
Titanium alloy

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Last updated on 2018-09-11 at 00:00