Creep behavior and substructures of α2 Ti-34mol%Al intermetallics

Yuji Nagae; Toshihiko Fukuda; Makoto Ohtsuka; Hiroyuki Sato; Hiroshi Oikawa

doi:10.1016/S0966-9795(96)00096-9

Creep behavior and substructures of α₂ Ti-34mol%Al intermetallics

Yuji Nagae, Toshihiko Fukuda, Makoto Ohtsuka, Hiroyuki Sato, Hiroshi Oikawa

IMRAM - Center for Mineral Processing and Metallurgy (CMPM)

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

3 Citations (Scopus)

Abstract

The creep behavior of α₂ Ti-34mol%Al has been investigated at 1050-1250 K under 70-500 MPa. The effect of the initial grain-size in the range 40-130 μm has also been studied. Characteristics of stress and temperature dependence of the minimum creep-rate can be classified into three regions: the stress exponent, the activation energy and the grain-size exponent for the minimum creep-rate have a set of characteristic values in each region. The formation of deformation twins and their growth play an important role in the recovery process of creep in higher stress regions at least up to the strain attaining the minimum creep-rate. In lower stress regions, the glide and recovery of dislocations play an essential role in creep.

Original language	English
Pages (from-to)	321-328
Number of pages	8
Journal	Intermetallics
Volume	5
Issue number	4
DOIs	https://doi.org/10.1016/S0966-9795(96)00096-9
Publication status	Published - 1997

Keywords

A. titanium aluminides, based on TiAl and TiAl
B. creep (properties and mechanisms), twinning
D. defects: dislocation geometry and arrangement

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10.1016/S0966-9795(96)00096-9

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title = "Creep behavior and substructures of α2 Ti-34mol%Al intermetallics",

abstract = "The creep behavior of α2 Ti-34mol%Al has been investigated at 1050-1250 K under 70-500 MPa. The effect of the initial grain-size in the range 40-130 μm has also been studied. Characteristics of stress and temperature dependence of the minimum creep-rate can be classified into three regions: the stress exponent, the activation energy and the grain-size exponent for the minimum creep-rate have a set of characteristic values in each region. The formation of deformation twins and their growth play an important role in the recovery process of creep in higher stress regions at least up to the strain attaining the minimum creep-rate. In lower stress regions, the glide and recovery of dislocations play an essential role in creep.",

keywords = "A. titanium aluminides, based on TiAl and TiAl, B. creep (properties and mechanisms), twinning, D. defects: dislocation geometry and arrangement",

author = "Yuji Nagae and Toshihiko Fukuda and Makoto Ohtsuka and Hiroyuki Sato and Hiroshi Oikawa",

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T1 - Creep behavior and substructures of α2 Ti-34mol%Al intermetallics

AU - Nagae, Yuji

AU - Fukuda, Toshihiko

AU - Ohtsuka, Makoto

AU - Sato, Hiroyuki

AU - Oikawa, Hiroshi

N1 - Funding Information: material. This work was supported in part by Grants-in-Aid from the Ministry of EducationN os 03650564an d 04239105.

PY - 1997

Y1 - 1997

N2 - The creep behavior of α2 Ti-34mol%Al has been investigated at 1050-1250 K under 70-500 MPa. The effect of the initial grain-size in the range 40-130 μm has also been studied. Characteristics of stress and temperature dependence of the minimum creep-rate can be classified into three regions: the stress exponent, the activation energy and the grain-size exponent for the minimum creep-rate have a set of characteristic values in each region. The formation of deformation twins and their growth play an important role in the recovery process of creep in higher stress regions at least up to the strain attaining the minimum creep-rate. In lower stress regions, the glide and recovery of dislocations play an essential role in creep.

AB - The creep behavior of α2 Ti-34mol%Al has been investigated at 1050-1250 K under 70-500 MPa. The effect of the initial grain-size in the range 40-130 μm has also been studied. Characteristics of stress and temperature dependence of the minimum creep-rate can be classified into three regions: the stress exponent, the activation energy and the grain-size exponent for the minimum creep-rate have a set of characteristic values in each region. The formation of deformation twins and their growth play an important role in the recovery process of creep in higher stress regions at least up to the strain attaining the minimum creep-rate. In lower stress regions, the glide and recovery of dislocations play an essential role in creep.

KW - A. titanium aluminides, based on TiAl and TiAl

KW - B. creep (properties and mechanisms), twinning

KW - D. defects: dislocation geometry and arrangement

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ER -

Creep behavior and substructures of α₂ Ti-34mol%Al intermetallics

Abstract

Keywords

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