Superplasticity of Ti-6Al-7Nb alloys with different initial microstructures processed by high-pressure torsion
Kathy González Jiménez, Joaquín E. González Hernández, Jorge M. Cubero-Sesin, Jeremy Barrantes Rodríguez, Zenji Horita
download PDFAbstract. Ti-6Al-7Nb alloy was quenched below and above the β-phase field and processed by high-pressure torsion (HPT) to produce different grain sizes in the ultra-fine range. The influence of temperature and strain rate over the superplastic properties, activation energy and strain rate sensitivity were evaluated by high temperature tensile tests. The mechanical properties were complemented with Vickers microhardness measurement of heat treated and HPT-processed samples. The crystallographic analysis was performed through XRD and EBSD studies in the grip and tip of the high temperature tensile specimens. Microhardness measurements show significant hardening with respect to the imposed strain after HPT. Meanwhile, high superplastic elongation of 1200% was accomplished at 850 °C with a strain rate of 2×10-3 s-1. EBSD studies of the failed specimens suggest that the tip part exhibited dynamic recrystallization during tensile test, which produced a larger grain size of ~5.1 µm and higher fraction of β phase of 3.7%, with respect to the grip part under static recrystallization, which attained ~3.4 µm grain size and 3.3% β phase fraction.
Keywords
High-Pressure Torsion, Ultrafine Grained, Nanostructure, Superplasticity, Strain Rate Sensitivity, Activation Energy
Published online , 9 pages
Copyright © 2023 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: Kathy González Jiménez, Joaquín E. González Hernández, Jorge M. Cubero-Sesin, Jeremy Barrantes Rodríguez, Zenji Horita, Superplasticity of Ti-6Al-7Nb alloys with different initial microstructures processed by high-pressure torsion, Materials Research Proceedings, Vol. 32, pp 72-80, 2023
DOI: https://doi.org/10.21741/9781644902615-7
The article was published as article 7 of the book Superplasticity in Advanced Materials
Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
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