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Title: High-temperature deformation behavior of the extruded Ti-22Al-25Nb alloy fabricated by powder metallurgy

Abstract

Highlights: • The high-temperature deformation behavior of the extruded Ti-22Al-25Nb alloy was analyzed. • A true strain-compensated Arrhenius-type constitutive model was established. • The processing maps of true strains 0.2, 0.4, and 0.6 were constructed to optimize the processing parameters. • Microstructural evolution and deformation mechanism in different conditions were explained. - Abstract: The hot-deformation behavior of the extruded Ti-22Al-25Nb alloy was investigated by compression testing in the 1213–1333 K temperature range, under a 0.001–1.0 s{sup −1} strain-rate range. The activation energy, Q, at a deformation strain of 0.3, was calculated to be 574.80 kJ mol{sup −1}. A strain-compensated Arrhenius-type constitutive model was established for this alloy, with an average absolute relative error (AARE) and correlation coefficient (R) of 7.64% and 0.994, respectively. Based on the dynamic materials model (DMM), processing maps were developed by combining the power dissipation and instability maps. An instability region was identified in the 1213–1278 K temperature range and 0.022–1.0 s{sup −1} strain-rate range. The microstructure of specimens deformed under different conditions were analyzed to characterize the corresponding deformation mechanisms. The main softening mechanisms in the stability regions were dynamic recrystallization (DRX) and dynamic globularization. The grain size of the specimen deformed at 1313 K/0.001more » s{sup −1} was approximately 15.2 μm.« less

Authors:
; ; ; ;  [1]
  1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001 (China)
Publication Date:
OSTI Identifier:
22804922
Resource Type:
Journal Article
Journal Name:
Materials Characterization
Additional Journal Information:
Journal Volume: 137; Other Information: Copyright (c) 2017 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; ACTIVATION ENERGY; ALUMINIUM COMPOUNDS; DEFORMATION; NIOBIUM COMPOUNDS; POWDER METALLURGY; RECRYSTALLIZATION; STABILITY; STRAIN RATE; TERNARY ALLOY SYSTEMS; TITANIUM COMPOUNDS

Citation Formats

Yang, Jianlei, Wang, Guofeng, Jiao, Xueyan, Li, You, and Liu, Qing. High-temperature deformation behavior of the extruded Ti-22Al-25Nb alloy fabricated by powder metallurgy. United States: N. p., 2018. Web. doi:10.1016/J.MATCHAR.2018.01.019.
Yang, Jianlei, Wang, Guofeng, Jiao, Xueyan, Li, You, & Liu, Qing. High-temperature deformation behavior of the extruded Ti-22Al-25Nb alloy fabricated by powder metallurgy. United States. doi:10.1016/J.MATCHAR.2018.01.019.
Yang, Jianlei, Wang, Guofeng, Jiao, Xueyan, Li, You, and Liu, Qing. Thu . "High-temperature deformation behavior of the extruded Ti-22Al-25Nb alloy fabricated by powder metallurgy". United States. doi:10.1016/J.MATCHAR.2018.01.019.
@article{osti_22804922,
title = {High-temperature deformation behavior of the extruded Ti-22Al-25Nb alloy fabricated by powder metallurgy},
author = {Yang, Jianlei and Wang, Guofeng and Jiao, Xueyan and Li, You and Liu, Qing},
abstractNote = {Highlights: • The high-temperature deformation behavior of the extruded Ti-22Al-25Nb alloy was analyzed. • A true strain-compensated Arrhenius-type constitutive model was established. • The processing maps of true strains 0.2, 0.4, and 0.6 were constructed to optimize the processing parameters. • Microstructural evolution and deformation mechanism in different conditions were explained. - Abstract: The hot-deformation behavior of the extruded Ti-22Al-25Nb alloy was investigated by compression testing in the 1213–1333 K temperature range, under a 0.001–1.0 s{sup −1} strain-rate range. The activation energy, Q, at a deformation strain of 0.3, was calculated to be 574.80 kJ mol{sup −1}. A strain-compensated Arrhenius-type constitutive model was established for this alloy, with an average absolute relative error (AARE) and correlation coefficient (R) of 7.64% and 0.994, respectively. Based on the dynamic materials model (DMM), processing maps were developed by combining the power dissipation and instability maps. An instability region was identified in the 1213–1278 K temperature range and 0.022–1.0 s{sup −1} strain-rate range. The microstructure of specimens deformed under different conditions were analyzed to characterize the corresponding deformation mechanisms. The main softening mechanisms in the stability regions were dynamic recrystallization (DRX) and dynamic globularization. The grain size of the specimen deformed at 1313 K/0.001 s{sup −1} was approximately 15.2 μm.},
doi = {10.1016/J.MATCHAR.2018.01.019},
journal = {Materials Characterization},
issn = {1044-5803},
number = ,
volume = 137,
place = {United States},
year = {2018},
month = {3}
}