Effect of fine precipitation of coherent disordered phase on creep strength of L12-ordered Co3Ti

H. Takesue, K. Oh-ishi, Zenji Horita, M. Nemoto

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Compressive creep tests were performed under constant stress over a range of temperatures from 923 to 1073 K on precipitation strengthened L12-ordered Co3Ti. The creep rates decrease appreciably by the fine precipitation of coherent disordered f.c.c. Co-rich phase when the applied stress is low. An analysis of the creep data is developed taking a threshold stress into account of the creep equations. The significance of the threshold stress is discussed based upon the transmission electron microscope observations of the interaction between dislocations and precipitates. The superdislocations produced during deformation tend to be strongly attracted and dissociate as they meet the coherent disordered precipitates because the anti-phase boundary energy in the disordered phase is zero. The extra stress necessary to pull the dislocation out of the precipitates may play an important role to establish the threshold stress which is expected to be beneficial to the improvement of the creep strength of L12-ordered intermetallics for high temperature structural applications.

Original languageEnglish
Pages (from-to)479-484
Number of pages6
JournalMaterials Science and Engineering A
Volume239-240
Issue number1-2
Publication statusPublished - Dec 1 1997

Fingerprint

creep strength
Creep
Precipitates
precipitates
thresholds
creep tests
antiphase boundaries
Phase boundaries
Intermetallics
intermetallics
Electron microscopes
electron microscopes
Temperature

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Effect of fine precipitation of coherent disordered phase on creep strength of L12-ordered Co3Ti. / Takesue, H.; Oh-ishi, K.; Horita, Zenji; Nemoto, M.

In: Materials Science and Engineering A, Vol. 239-240, No. 1-2, 01.12.1997, p. 479-484.

Research output: Contribution to journalArticle

Takesue, H, Oh-ishi, K, Horita, Z & Nemoto, M 1997, 'Effect of fine precipitation of coherent disordered phase on creep strength of L12-ordered Co3Ti', Materials Science and Engineering A, vol. 239-240, no. 1-2, pp. 479-484.
Takesue, H. ; Oh-ishi, K. ; Horita, Zenji ; Nemoto, M. / Effect of fine precipitation of coherent disordered phase on creep strength of L12-ordered Co3Ti. In: Materials Science and Engineering A. 1997 ; Vol. 239-240, No. 1-2. pp. 479-484.
@article{40747385cc67490fb75e240a242efd7b,
title = "Effect of fine precipitation of coherent disordered phase on creep strength of L12-ordered Co3Ti",
abstract = "Compressive creep tests were performed under constant stress over a range of temperatures from 923 to 1073 K on precipitation strengthened L12-ordered Co3Ti. The creep rates decrease appreciably by the fine precipitation of coherent disordered f.c.c. Co-rich phase when the applied stress is low. An analysis of the creep data is developed taking a threshold stress into account of the creep equations. The significance of the threshold stress is discussed based upon the transmission electron microscope observations of the interaction between dislocations and precipitates. The superdislocations produced during deformation tend to be strongly attracted and dissociate as they meet the coherent disordered precipitates because the anti-phase boundary energy in the disordered phase is zero. The extra stress necessary to pull the dislocation out of the precipitates may play an important role to establish the threshold stress which is expected to be beneficial to the improvement of the creep strength of L12-ordered intermetallics for high temperature structural applications.",
author = "H. Takesue and K. Oh-ishi and Zenji Horita and M. Nemoto",
year = "1997",
month = "12",
day = "1",
language = "English",
volume = "239-240",
pages = "479--484",
journal = "Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing",
issn = "0921-5093",
publisher = "Elsevier BV",
number = "1-2",

}

TY - JOUR

T1 - Effect of fine precipitation of coherent disordered phase on creep strength of L12-ordered Co3Ti

AU - Takesue, H.

AU - Oh-ishi, K.

AU - Horita, Zenji

AU - Nemoto, M.

PY - 1997/12/1

Y1 - 1997/12/1

N2 - Compressive creep tests were performed under constant stress over a range of temperatures from 923 to 1073 K on precipitation strengthened L12-ordered Co3Ti. The creep rates decrease appreciably by the fine precipitation of coherent disordered f.c.c. Co-rich phase when the applied stress is low. An analysis of the creep data is developed taking a threshold stress into account of the creep equations. The significance of the threshold stress is discussed based upon the transmission electron microscope observations of the interaction between dislocations and precipitates. The superdislocations produced during deformation tend to be strongly attracted and dissociate as they meet the coherent disordered precipitates because the anti-phase boundary energy in the disordered phase is zero. The extra stress necessary to pull the dislocation out of the precipitates may play an important role to establish the threshold stress which is expected to be beneficial to the improvement of the creep strength of L12-ordered intermetallics for high temperature structural applications.

AB - Compressive creep tests were performed under constant stress over a range of temperatures from 923 to 1073 K on precipitation strengthened L12-ordered Co3Ti. The creep rates decrease appreciably by the fine precipitation of coherent disordered f.c.c. Co-rich phase when the applied stress is low. An analysis of the creep data is developed taking a threshold stress into account of the creep equations. The significance of the threshold stress is discussed based upon the transmission electron microscope observations of the interaction between dislocations and precipitates. The superdislocations produced during deformation tend to be strongly attracted and dissociate as they meet the coherent disordered precipitates because the anti-phase boundary energy in the disordered phase is zero. The extra stress necessary to pull the dislocation out of the precipitates may play an important role to establish the threshold stress which is expected to be beneficial to the improvement of the creep strength of L12-ordered intermetallics for high temperature structural applications.

UR - http://www.scopus.com/inward/record.url?scp=0006702887&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0006702887&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0006702887

VL - 239-240

SP - 479

EP - 484

JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

SN - 0921-5093

IS - 1-2

ER -