Production of Superplastic Ti-6Al-7Nb Alloy Using High-Pressure Sliding Process

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F19%3A00511894" target="_blank" >RIV/68081723:_____/19:00511894 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.jstage.jst.go.jp/article/matertrans/60/9/60_ME201924/_html/-char/en" target="_blank" >https://www.jstage.jst.go.jp/article/matertrans/60/9/60_ME201924/_html/-char/en</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.2320/matertrans.ME201924" target="_blank" >10.2320/matertrans.ME201924</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Production of Superplastic Ti-6Al-7Nb Alloy Using High-Pressure Sliding Process

Popis výsledku v původním jazyce

A Ti-6Al-7Nb alloy was processed by severe plastic deformation through high-pressure sliding (HPS) at room temperature for grain refinement. The microstructure consists of grains with sizes of 200-300nm in diameter having high and low angles boundaries. Superplasticity appeared with the total elongation of more than 400% and this was more likely when the tensile specimen is deformed in the direction parallel than perpendicular to the sliding direction. However, the superplastic elongation is almost the same irrespective of whether the sliding was made in the single direction or in the reversible directions as far as the total sliding distance is the same. The total elongation is invariably higher for the tensile testing at 1123K than at the other temperatures, reaching the highest elongation of 790% at the initial strain rate of 1 x 10(-3) s(-1). The strain rate sensitivity and the activation energy for the deformation were determined to be more than similar to 0.3 and 199 kJ/mol, respectively. The microstructural observation reveals that the alpha phase region covers more than 85% of the tensile specimens after deformation and their grains are equiaxed in shape. It is concluded that the superplastic deformation is mainly controlled by grain boundary sliding through thermally activation by lattice diffusion.

Název v anglickém jazyce

Production of Superplastic Ti-6Al-7Nb Alloy Using High-Pressure Sliding Process

Popis výsledku anglicky

A Ti-6Al-7Nb alloy was processed by severe plastic deformation through high-pressure sliding (HPS) at room temperature for grain refinement. The microstructure consists of grains with sizes of 200-300nm in diameter having high and low angles boundaries. Superplasticity appeared with the total elongation of more than 400% and this was more likely when the tensile specimen is deformed in the direction parallel than perpendicular to the sliding direction. However, the superplastic elongation is almost the same irrespective of whether the sliding was made in the single direction or in the reversible directions as far as the total sliding distance is the same. The total elongation is invariably higher for the tensile testing at 1123K than at the other temperatures, reaching the highest elongation of 790% at the initial strain rate of 1 x 10(-3) s(-1). The strain rate sensitivity and the activation energy for the deformation were determined to be more than similar to 0.3 and 199 kJ/mol, respectively. The microstructural observation reveals that the alpha phase region covers more than 85% of the tensile specimens after deformation and their grains are equiaxed in shape. It is concluded that the superplastic deformation is mainly controlled by grain boundary sliding through thermally activation by lattice diffusion.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Materials Transactions

ISSN

1345-9678

e-ISSN

—

Svazek periodika

60

Číslo periodika v rámci svazku

9

Stát vydavatele periodika

JP - Japonsko

Počet stran výsledku

7

Strana od-do

1785-1791

Kód UT WoS článku

000489965000010

EID výsledku v databázi Scopus

2-s2.0-85071438266