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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 16    No. 2    April 2006

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Deformation behavior and mechanisms of Ti-1023 alloy
BAO Ru-qiang(鲍如强), HUANG Xu(黄 旭), CAO Chun-xiao(曹春晓)

Beijing Institute of Aeronautical Materials, Beijing 100095, China

Abstract:The deformation behavior and mechanisms of Ti-1023 alloy were studied in the temperature range of 650−900 ℃ and strain rate range of 0.001−10 s−1 by compression and tensile tests. The results show that in a limited strain rate range of 0.001−0.1 s−1, the kinetic rate equation is obeyed and a linear fit is obtained at all the temperatures. The apparent activation energy is 322 kJ/mol in the α-β region and 160 kJ/mol in the β region, respectively. Power dissipation maps of this alloy developed by using Gleeble test data show three domains in the tested range. Superplasticity, marked by abnormal elongation at 700 ℃, occurs in the temperature range of 650−750 ℃ and at strain rates below about 0.03 s−1. Large grain superplasticity takes place in the temperature range of 750−850 ℃ and strain rates range of 0.001−0.03 s−1. Dynamic recrystallization occurs in the temperature range of 850-900 ℃ and at strain rates below about 1 s−1. The instability maps of this alloy were also developed.

 

Key words: Ti-1023 alloy; deformation behavior; deformation mechanisms; processing maps; superplasticity

ISSN 1672-7029
CN 43-1423/U

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