Constitutive analysis on superplastic deformation mechanisms of two-phase Ti3Al-xNb alloy

Ji Sik Kim; Dong Hyuck Shin; Young Won Chang; Chong Soo Lee

doi:10.1016/j.msea.2004.11.036

Constitutive analysis on superplastic deformation mechanisms of two-phase Ti₃Al-xNb alloy

Ji Sik Kim, Dong Hyuck Shin, Young Won Chang, Chong Soo Lee

Department of Nano & Advanced Materials Science and Engineering

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

9 Scopus citations

Abstract

In this study, superplastic deformation mechanisms of two-phase Ti₃Al-xNb alloys were investigated in the context of inelastic deformation theory, which consists of grain matrix deformation (GMD) and grain boundary sliding (GBS). Flow stress-strain rate curves of the alloy were obtained by the load relaxation test as well as the strain rate change test at 950, 970 and 990 °C. The results showed that GMD and GBS of three specimens containing different amounts (21, 50 and 77%) of β were well described by the plastic deformation equation and viscous flow equation of the theory, respectively. Accommodation of deformation strains was found to occur in both α₂ and β phase. The sliding resistance was analyzed for the different types of boundaries, which revealed the lowest resistance in the α₂/α₂ boundary and increased in the following order; α₂/ α₂ ≪ α₂/β < β/β.

Original language	English
Pages (from-to)	117-125
Number of pages	9
Journal	Materials Science and Engineering: A
Volume	394
Issue number	1-2
DOIs	https://doi.org/10.1016/j.msea.2004.11.036
State	Published - 15 Mar 2005

Keywords

Grain boundary sliding
Grain matrix deformation
Inelastic deformation theory
Intermetallic alloy
Superplasticity

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10.1016/j.msea.2004.11.036

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title = "Constitutive analysis on superplastic deformation mechanisms of two-phase Ti3Al-xNb alloy",

abstract = "In this study, superplastic deformation mechanisms of two-phase Ti3Al-xNb alloys were investigated in the context of inelastic deformation theory, which consists of grain matrix deformation (GMD) and grain boundary sliding (GBS). Flow stress-strain rate curves of the alloy were obtained by the load relaxation test as well as the strain rate change test at 950, 970 and 990 °C. The results showed that GMD and GBS of three specimens containing different amounts (21, 50 and 77%) of β were well described by the plastic deformation equation and viscous flow equation of the theory, respectively. Accommodation of deformation strains was found to occur in both α2 and β phase. The sliding resistance was analyzed for the different types of boundaries, which revealed the lowest resistance in the α2/α2 boundary and increased in the following order; α2/ α2 ≪ α2/β < β/β.",

keywords = "Grain boundary sliding, Grain matrix deformation, Inelastic deformation theory, Intermetallic alloy, Superplasticity",

author = "Kim, {Ji Sik} and Shin, {Dong Hyuck} and Chang, {Young Won} and Lee, {Chong Soo}",

year = "2005",

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doi = "10.1016/j.msea.2004.11.036",

language = "English",

volume = "394",

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journal = "Materials Science and Engineering: A",

issn = "0921-5093",

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number = "1-2",

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T1 - Constitutive analysis on superplastic deformation mechanisms of two-phase Ti3Al-xNb alloy

AU - Kim, Ji Sik

AU - Shin, Dong Hyuck

AU - Chang, Young Won

AU - Lee, Chong Soo

PY - 2005/3/15

Y1 - 2005/3/15

N2 - In this study, superplastic deformation mechanisms of two-phase Ti3Al-xNb alloys were investigated in the context of inelastic deformation theory, which consists of grain matrix deformation (GMD) and grain boundary sliding (GBS). Flow stress-strain rate curves of the alloy were obtained by the load relaxation test as well as the strain rate change test at 950, 970 and 990 °C. The results showed that GMD and GBS of three specimens containing different amounts (21, 50 and 77%) of β were well described by the plastic deformation equation and viscous flow equation of the theory, respectively. Accommodation of deformation strains was found to occur in both α2 and β phase. The sliding resistance was analyzed for the different types of boundaries, which revealed the lowest resistance in the α2/α2 boundary and increased in the following order; α2/ α2 ≪ α2/β < β/β.

AB - In this study, superplastic deformation mechanisms of two-phase Ti3Al-xNb alloys were investigated in the context of inelastic deformation theory, which consists of grain matrix deformation (GMD) and grain boundary sliding (GBS). Flow stress-strain rate curves of the alloy were obtained by the load relaxation test as well as the strain rate change test at 950, 970 and 990 °C. The results showed that GMD and GBS of three specimens containing different amounts (21, 50 and 77%) of β were well described by the plastic deformation equation and viscous flow equation of the theory, respectively. Accommodation of deformation strains was found to occur in both α2 and β phase. The sliding resistance was analyzed for the different types of boundaries, which revealed the lowest resistance in the α2/α2 boundary and increased in the following order; α2/ α2 ≪ α2/β < β/β.

KW - Grain boundary sliding

KW - Grain matrix deformation

KW - Inelastic deformation theory

KW - Intermetallic alloy

KW - Superplasticity

UR - http://www.scopus.com/inward/record.url?scp=17844398244&partnerID=8YFLogxK

U2 - 10.1016/j.msea.2004.11.036

DO - 10.1016/j.msea.2004.11.036

M3 - Article

AN - SCOPUS:17844398244

SN - 0921-5093

VL - 394

SP - 117

EP - 125

JO - Materials Science and Engineering: A

JF - Materials Science and Engineering: A

IS - 1-2

ER -

Constitutive analysis on superplastic deformation mechanisms of two-phase Ti₃Al-xNb alloy

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Keywords

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