Creep study of mechanisms involved in low-temperature superplasticity of UFG Ti-6Al-4V processed by SPD

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F16%3A00463463" target="_blank" >RIV/68081723:_____/16:00463463 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.matchar.2016.04.007" target="_blank" >http://dx.doi.org/10.1016/j.matchar.2016.04.007</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.matchar.2016.04.007" target="_blank" >10.1016/j.matchar.2016.04.007</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Creep study of mechanisms involved in low-temperature superplasticity of UFG Ti-6Al-4V processed by SPD

Popis výsledku v původním jazyce

The deformation kinetics of ultrafine-grained Ti-6Al-4V with mean (sub)grain size about 150 nm (produced by isothermal multiaxial forging) and superplastic properties at the relatively low temperature of 873 K was investigated in compression and tension over a large range of strain rates from 10- 7 to 10- 2 s- 1. Electron microscopic observations showed that the grains coarsen during deformation towards the quasi-stationary spacing wqs of strain induced boundaries. In spite of the grain coarsening the grains were generally smaller than wqs allowing high-angle boundaries to dominate the quasi-stationary strength. Texture measurements indicate that dislocation glide plays a large role in deformation. Glide in this alloy is significantly influenced by solid solution strengthening leading to a stress sensitivity of strain rate of n = 3. The present ultrafine-grained Ti alloy displays a stress sensitivity exponent n = 2 over an extended stress range where its superplastic behavior is optimal. While the deformation kinetics of present ultrafine-grained Ti alloy can be roughly explained by the traditional formula for superplastic flow, the significant discrepancy to the measured values suggests that solid solution strengthening must be taken into account to get a complete insight. © 2016 Elsevier Inc. All rights reserved.

Název v anglickém jazyce

Creep study of mechanisms involved in low-temperature superplasticity of UFG Ti-6Al-4V processed by SPD

Popis výsledku anglicky

The deformation kinetics of ultrafine-grained Ti-6Al-4V with mean (sub)grain size about 150 nm (produced by isothermal multiaxial forging) and superplastic properties at the relatively low temperature of 873 K was investigated in compression and tension over a large range of strain rates from 10- 7 to 10- 2 s- 1. Electron microscopic observations showed that the grains coarsen during deformation towards the quasi-stationary spacing wqs of strain induced boundaries. In spite of the grain coarsening the grains were generally smaller than wqs allowing high-angle boundaries to dominate the quasi-stationary strength. Texture measurements indicate that dislocation glide plays a large role in deformation. Glide in this alloy is significantly influenced by solid solution strengthening leading to a stress sensitivity of strain rate of n = 3. The present ultrafine-grained Ti alloy displays a stress sensitivity exponent n = 2 over an extended stress range where its superplastic behavior is optimal. While the deformation kinetics of present ultrafine-grained Ti alloy can be roughly explained by the traditional formula for superplastic flow, the significant discrepancy to the measured values suggests that solid solution strengthening must be taken into account to get a complete insight. © 2016 Elsevier Inc. All rights reserved.

Druh

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

CEP obor

JG - Hutnictví, kovové materiály

OECD FORD obor

—

Projekt

<a href="/cs/project/ED1.1.00%2F02.0068" target="_blank" >ED1.1.00/02.0068: CEITEC - central european institute of technology</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Materials Characterization

ISSN

1044-5803

e-ISSN

—

Svazek periodika

116

Číslo periodika v rámci svazku

JUN

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

6

Strana od-do

84-90

Kód UT WoS článku

000376698800011

EID výsledku v databázi Scopus

2-s2.0-84964526668