skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Dynamic recrystallization behavior of an as-cast TiAl alloy during hot compression

Abstract

High temperature compressive deformation behaviors of as-cast Ti–43Al–4Nb–1.4W–0.6B alloy were investigated at temperatures ranging from 1050 °C to 1200 °C, and strain rates from 0.001 s{sup −1} to 1 s{sup −1}. Electron back scattered diffraction technique, scanning electron microscopy and transmission electron microscopy were employed to investigate the microstructural evolutions and nucleation mechanisms of the dynamic recrystallization. The results indicated that the true stress–true strain curves show a dynamic flow softening behavior. The dependence of the peak stress on the deformation temperature and the strain rate can well be expressed by a hyperbolic-sine type equation. The activation energy decreases with increasing the strain. The size of the dynamically recrystallized β grains decreases with increasing the value of the Zener–Hollomon parameter (Z). When the flow stress reaches a steady state, the size of β grains almost remains constant with increasing the deformation strain. The continuous dynamic recrystallization plays a dominant role in the deformation. In order to characterize the evolution of dynamic recrystallization volume fraction, the dynamic recrystallization kinetics was studied by Avrami-type equation. Besides, the role of β phase and the softening mechanism during the hot deformation was also discussed in details. - Highlights: • The size of DRXed βmore » grains decreases with increasing the value of the Z. • The CDRX plays a dominant role in the deformation. • The broken TiB{sub 2} particles can promote the nucleation of DRX.« less

Authors:
 [1];  [1];  [2];  [1];  [1]
  1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083 (China)
  2. School of Aeronautics and Astronautics, Central South University, Changsha 410083 (China)
Publication Date:
OSTI Identifier:
22403595
Resource Type:
Journal Article
Journal Name:
Materials Characterization
Additional Journal Information:
Journal Volume: 97; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1044-5803
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM BASE ALLOYS; BACKSCATTERING; BORON ALLOYS; DEFORMATION; ELECTRON DIFFRACTION; FLOW STRESS; MICROSTRUCTURE; NIOBIUM ALLOYS; NUCLEATION; RECRYSTALLIZATION; SCANNING ELECTRON MICROSCOPY; STRAIN RATE; STRAINS; TITANIUM ALLOYS; TITANIUM BORIDES; TRANSMISSION ELECTRON MICROSCOPY; TUNGSTEN ALLOYS

Citation Formats

Li, Jianbo, Liu, Yong, Wang, Yan, Liu, Bin, and He, Yuehui. Dynamic recrystallization behavior of an as-cast TiAl alloy during hot compression. United States: N. p., 2014. Web. doi:10.1016/J.MATCHAR.2014.09.013.
Li, Jianbo, Liu, Yong, Wang, Yan, Liu, Bin, & He, Yuehui. Dynamic recrystallization behavior of an as-cast TiAl alloy during hot compression. United States. https://doi.org/10.1016/J.MATCHAR.2014.09.013
Li, Jianbo, Liu, Yong, Wang, Yan, Liu, Bin, and He, Yuehui. 2014. "Dynamic recrystallization behavior of an as-cast TiAl alloy during hot compression". United States. https://doi.org/10.1016/J.MATCHAR.2014.09.013.
@article{osti_22403595,
title = {Dynamic recrystallization behavior of an as-cast TiAl alloy during hot compression},
author = {Li, Jianbo and Liu, Yong and Wang, Yan and Liu, Bin and He, Yuehui},
abstractNote = {High temperature compressive deformation behaviors of as-cast Ti–43Al–4Nb–1.4W–0.6B alloy were investigated at temperatures ranging from 1050 °C to 1200 °C, and strain rates from 0.001 s{sup −1} to 1 s{sup −1}. Electron back scattered diffraction technique, scanning electron microscopy and transmission electron microscopy were employed to investigate the microstructural evolutions and nucleation mechanisms of the dynamic recrystallization. The results indicated that the true stress–true strain curves show a dynamic flow softening behavior. The dependence of the peak stress on the deformation temperature and the strain rate can well be expressed by a hyperbolic-sine type equation. The activation energy decreases with increasing the strain. The size of the dynamically recrystallized β grains decreases with increasing the value of the Zener–Hollomon parameter (Z). When the flow stress reaches a steady state, the size of β grains almost remains constant with increasing the deformation strain. The continuous dynamic recrystallization plays a dominant role in the deformation. In order to characterize the evolution of dynamic recrystallization volume fraction, the dynamic recrystallization kinetics was studied by Avrami-type equation. Besides, the role of β phase and the softening mechanism during the hot deformation was also discussed in details. - Highlights: • The size of DRXed β grains decreases with increasing the value of the Z. • The CDRX plays a dominant role in the deformation. • The broken TiB{sub 2} particles can promote the nucleation of DRX.},
doi = {10.1016/J.MATCHAR.2014.09.013},
url = {https://www.osti.gov/biblio/22403595}, journal = {Materials Characterization},
issn = {1044-5803},
number = ,
volume = 97,
place = {United States},
year = {Sat Nov 15 00:00:00 EST 2014},
month = {Sat Nov 15 00:00:00 EST 2014}
}