Dislocation Slip and Deformation Twinning Interplay during High Temperature Deformation in .gamma.-TiAl Base Intermetallics.

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F01%3A07013156" target="_blank" >RIV/68081723:_____/01:07013156 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Dislocation Slip and Deformation Twinning Interplay during High Temperature Deformation in .gamma.-TiAl Base Intermetallics.

Popis výsledku v původním jazyce

Interrupted compression creep tests were performed at 973 K and 350 MPa to study strain dependent microstructural changes in near-.gamma. equiaxed Ti-48A1-2Cr-2Nb-B alloy. Dislocation densities and volume fraction of deformation twins were measured in the range of strain where sharp creep rate minima occur. The steep decrease of creep rate during initial 1% of strain is associated with a considerable increase in density of ordinary dislocations and superdislocations. Twinning processes are rather limited during this primary stage. On the other hand, in the strain range of minimum creep rate the volume fraction of deformation twins grows due to the increasing number of twinned grains and decreasing spacing between individual twins. Based on these results it is suggested that, in the pure- and near-.gamma. TiAl equiaxed grain microstructures, the increase of creep rate after minimum and its new gradual saturation reflects a contribution of deformation twins to the creep strain accumulati

Název v anglickém jazyce

Dislocation Slip and Deformation Twinning Interplay during High Temperature Deformation in .gamma.-TiAl Base Intermetallics.

Popis výsledku anglicky

Interrupted compression creep tests were performed at 973 K and 350 MPa to study strain dependent microstructural changes in near-.gamma. equiaxed Ti-48A1-2Cr-2Nb-B alloy. Dislocation densities and volume fraction of deformation twins were measured in the range of strain where sharp creep rate minima occur. The steep decrease of creep rate during initial 1% of strain is associated with a considerable increase in density of ordinary dislocations and superdislocations. Twinning processes are rather limited during this primary stage. On the other hand, in the strain range of minimum creep rate the volume fraction of deformation twins grows due to the increasing number of twinned grains and decreasing spacing between individual twins. Based on these results it is suggested that, in the pure- and near-.gamma. TiAl equiaxed grain microstructures, the increase of creep rate after minimum and its new gradual saturation reflects a contribution of deformation twins to the creep strain accumulati

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

JG - Hutnictví, kovové materiály

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2001

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Materials Science and Engineering. A

ISSN

0921-5093

e-ISSN

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Svazek periodika

319-321

Číslo periodika v rámci svazku

N/A

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

7

Strana od-do

820-826

Kód UT WoS článku

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EID výsledku v databázi Scopus

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