Superplasticity in large-grained Fe3Al alloys

D. Lin; T. L. Lin; A. Shan; M. Chen

doi:10.1016/0966-9795(96)00027-1

Superplasticity in large-grained Fe₃Al alloys

D. Lin, T. L. Lin, A. Shan, M. Chen

Research output: Contribution to journal › Article › peer-review

72 Citations (Scopus)

Abstract

The superplasticity behavior of Fe-28Al, Fe-28Al-2Ti and Fe-28Al-4Ti (all compositions reported in this paper are in atomic percent) alloys has been investigated by tensile testing, optical microscopy and transmission electron microscopy. Tensile tests were performed at 700-900°C under a strain rate range of about 10^-5-10²/s.The maximum strain rate sensitivity index m was found to be 0.5 and the largest elongation reached 620%. The flow activation energy was measured to be 263 kJ/mol for Fe-28Al and 191 KJ/mol for Fe-28Al-2Ti, which is much lower than the creep activation energy generally observed in Fe₃Al alloys. After deformation, the grain size became much finer; from about 100 μm to 20-30 μm. As combined with TEM observations, we suggested that a continuous recrystallization process took place and superplasticity may arise from this process.

Original language	English
Pages (from-to)	489-496
Number of pages	8
Journal	Intermetallics
Volume	4
Issue number	6
DOIs	https://doi.org/10.1016/0966-9795(96)00027-1
Publication status	Published - 1996 Sept

Keywords

A. iron aluminides based on FeAl
B. superplastic behaviour
C. recovery
D. large grains
Recrystallization

ASJC Scopus subject areas

Chemistry(all)
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Access to Document

10.1016/0966-9795(96)00027-1

Cite this

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title = "Superplasticity in large-grained Fe3Al alloys",

abstract = "The superplasticity behavior of Fe-28Al, Fe-28Al-2Ti and Fe-28Al-4Ti (all compositions reported in this paper are in atomic percent) alloys has been investigated by tensile testing, optical microscopy and transmission electron microscopy. Tensile tests were performed at 700-900°C under a strain rate range of about 10-5-102/s.The maximum strain rate sensitivity index m was found to be 0.5 and the largest elongation reached 620%. The flow activation energy was measured to be 263 kJ/mol for Fe-28Al and 191 KJ/mol for Fe-28Al-2Ti, which is much lower than the creep activation energy generally observed in Fe3Al alloys. After deformation, the grain size became much finer; from about 100 μm to 20-30 μm. As combined with TEM observations, we suggested that a continuous recrystallization process took place and superplasticity may arise from this process.",

keywords = "A. iron aluminides based on FeAl, B. superplastic behaviour, C. recovery, D. large grains, Recrystallization",

author = "D. Lin and Lin, {T. L.} and A. Shan and M. Chen",

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AU - Lin, D.

AU - Lin, T. L.

AU - Shan, A.

AU - Chen, M.

PY - 1996/9

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N2 - The superplasticity behavior of Fe-28Al, Fe-28Al-2Ti and Fe-28Al-4Ti (all compositions reported in this paper are in atomic percent) alloys has been investigated by tensile testing, optical microscopy and transmission electron microscopy. Tensile tests were performed at 700-900°C under a strain rate range of about 10-5-102/s.The maximum strain rate sensitivity index m was found to be 0.5 and the largest elongation reached 620%. The flow activation energy was measured to be 263 kJ/mol for Fe-28Al and 191 KJ/mol for Fe-28Al-2Ti, which is much lower than the creep activation energy generally observed in Fe3Al alloys. After deformation, the grain size became much finer; from about 100 μm to 20-30 μm. As combined with TEM observations, we suggested that a continuous recrystallization process took place and superplasticity may arise from this process.

AB - The superplasticity behavior of Fe-28Al, Fe-28Al-2Ti and Fe-28Al-4Ti (all compositions reported in this paper are in atomic percent) alloys has been investigated by tensile testing, optical microscopy and transmission electron microscopy. Tensile tests were performed at 700-900°C under a strain rate range of about 10-5-102/s.The maximum strain rate sensitivity index m was found to be 0.5 and the largest elongation reached 620%. The flow activation energy was measured to be 263 kJ/mol for Fe-28Al and 191 KJ/mol for Fe-28Al-2Ti, which is much lower than the creep activation energy generally observed in Fe3Al alloys. After deformation, the grain size became much finer; from about 100 μm to 20-30 μm. As combined with TEM observations, we suggested that a continuous recrystallization process took place and superplasticity may arise from this process.

KW - A. iron aluminides based on FeAl

KW - B. superplastic behaviour

KW - C. recovery

KW - D. large grains

KW - Recrystallization

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