Flow behavior and constitutive relationship for elevated temperature compressive deformation of a high Nb containing TiAl alloy with (α2 + γ) microstructure

Yudong Chu; Jinshan Li; Fengtong Zhao; Bin Tang; Hongchao Kou

doi:10.1016/j.matlet.2017.08.131

Flow behavior and constitutive relationship for elevated temperature compressive deformation of a high Nb containing TiAl alloy with (α₂ + γ) microstructure

Yudong Chu, Jinshan Li, Fengtong Zhao, Bin Tang, Hongchao Kou

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

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

13 Scopus citations

Abstract

The isothermal compression of a Ti-43.5Al-8 Nb-0.2 W-0.2 B (at.%) alloy with (α₂ + γ) microstructure has been examined at temperature range of 950–1050 °C under strain rate range of 10⁻²–10⁻⁵ s⁻¹. The results showed that the value of m (strain rate sensitivity factor) increased from 0.18 through 0.33 to 0.48 with decreasing diffusion compensated strain rates. This indicates a transition of deformation mechanism from dislocation creep to grain boundary sliding (GBS), which was observed in the microstructure characterization. The transition took place over about one and a half orders of magnitude in diffusion-compensated strain rate may also be predicted by employing unified rate constitutive equations for dislocation creep and GBS in an additive manner.

Original language	English
Pages (from-to)	58-61
Number of pages	4
Journal	Materials Letters
Volume	210
DOIs	https://doi.org/10.1016/j.matlet.2017.08.131
State	Published - 1 Jan 2018

Keywords

Dislocation creep
Grain boundary sliding
Isothermal compression
Microstructure
Simulation and modelling
Titanium aluminides

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10.1016/j.matlet.2017.08.131

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title = "Flow behavior and constitutive relationship for elevated temperature compressive deformation of a high Nb containing TiAl alloy with (α2 + γ) microstructure",

abstract = "The isothermal compression of a Ti-43.5Al-8 Nb-0.2 W-0.2 B (at.%) alloy with (α2 + γ) microstructure has been examined at temperature range of 950–1050 °C under strain rate range of 10−2–10−5 s−1. The results showed that the value of m (strain rate sensitivity factor) increased from 0.18 through 0.33 to 0.48 with decreasing diffusion compensated strain rates. This indicates a transition of deformation mechanism from dislocation creep to grain boundary sliding (GBS), which was observed in the microstructure characterization. The transition took place over about one and a half orders of magnitude in diffusion-compensated strain rate may also be predicted by employing unified rate constitutive equations for dislocation creep and GBS in an additive manner.",

keywords = "Dislocation creep, Grain boundary sliding, Isothermal compression, Microstructure, Simulation and modelling, Titanium aluminides",

author = "Yudong Chu and Jinshan Li and Fengtong Zhao and Bin Tang and Hongchao Kou",

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doi = "10.1016/j.matlet.2017.08.131",

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T1 - Flow behavior and constitutive relationship for elevated temperature compressive deformation of a high Nb containing TiAl alloy with (α2 + γ) microstructure

AU - Chu, Yudong

AU - Li, Jinshan

AU - Zhao, Fengtong

AU - Tang, Bin

AU - Kou, Hongchao

PY - 2018/1/1

Y1 - 2018/1/1

N2 - The isothermal compression of a Ti-43.5Al-8 Nb-0.2 W-0.2 B (at.%) alloy with (α2 + γ) microstructure has been examined at temperature range of 950–1050 °C under strain rate range of 10−2–10−5 s−1. The results showed that the value of m (strain rate sensitivity factor) increased from 0.18 through 0.33 to 0.48 with decreasing diffusion compensated strain rates. This indicates a transition of deformation mechanism from dislocation creep to grain boundary sliding (GBS), which was observed in the microstructure characterization. The transition took place over about one and a half orders of magnitude in diffusion-compensated strain rate may also be predicted by employing unified rate constitutive equations for dislocation creep and GBS in an additive manner.

AB - The isothermal compression of a Ti-43.5Al-8 Nb-0.2 W-0.2 B (at.%) alloy with (α2 + γ) microstructure has been examined at temperature range of 950–1050 °C under strain rate range of 10−2–10−5 s−1. The results showed that the value of m (strain rate sensitivity factor) increased from 0.18 through 0.33 to 0.48 with decreasing diffusion compensated strain rates. This indicates a transition of deformation mechanism from dislocation creep to grain boundary sliding (GBS), which was observed in the microstructure characterization. The transition took place over about one and a half orders of magnitude in diffusion-compensated strain rate may also be predicted by employing unified rate constitutive equations for dislocation creep and GBS in an additive manner.

KW - Dislocation creep

KW - Grain boundary sliding

KW - Isothermal compression

KW - Microstructure

KW - Simulation and modelling

KW - Titanium aluminides

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DO - 10.1016/j.matlet.2017.08.131

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SN - 0167-577X

VL - 210

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EP - 61

JO - Materials Letters

JF - Materials Letters

ER -

Flow behavior and constitutive relationship for elevated temperature compressive deformation of a high Nb containing TiAl alloy with (α₂ + γ) microstructure

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Keywords

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