Microstructure and mechanical properties of Ti-45Al-2W-xC alloys

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27360%2F22%3A10250533" target="_blank" >RIV/61989100:27360/22:10250533 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0966979522001595?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0966979522001595?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.intermet.2022.107618" target="_blank" >10.1016/j.intermet.2022.107618</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Microstructure and mechanical properties of Ti-45Al-2W-xC alloys

Popis výsledku v původním jazyce

The microstructure and mechanical properties of five alloys with nominal compositions of Ti-45Al-2W-xC (in at. %), where x is ranging from 0.4 to 2.0 at.%, were studied. The alloys were prepared by vacuum induction melting in graphite crucibles, followed by centrifugal casting into a graphite mould. The as-cast alloys were subjected to hot isostatic pressing and heat treatment consisting of solution annealing, cooling at a constant rate and stabilisation annealing. The microstructure of the heat-treated alloys consists of equiaxed alpha 2(Ti3Al) + gamma(TiAl) lamellar grains surrounded by gamma grain boundaries with a small amount of beta/B2 particles. The alpha 2-alpha 2 interlamellar spacing lambda decreases with increasing carbon content until a solubility limit of carbon is achieved. The increase in carbon content above the solubility limit leads to the formation of primary Ti2AlC particles during solidification and an increase in the amount of gamma phase at grain boundaries. Vickers microhardness of lamellar grains depends on the carbon content and interlamellar spacing lambda. The studied Ti-45Al-2W-0.8C and Ti-45Al-2W-1.2C alloys show improved creep resistance at 800 degrees C compared to that of the reference carbon-free TiAl-W and carbon-containing TiAl-Nb based alloys with fully lamellar, nearly lamellar, convoluted or pseudo-duplex microstructure.

Název v anglickém jazyce

Microstructure and mechanical properties of Ti-45Al-2W-xC alloys

Popis výsledku anglicky

The microstructure and mechanical properties of five alloys with nominal compositions of Ti-45Al-2W-xC (in at. %), where x is ranging from 0.4 to 2.0 at.%, were studied. The alloys were prepared by vacuum induction melting in graphite crucibles, followed by centrifugal casting into a graphite mould. The as-cast alloys were subjected to hot isostatic pressing and heat treatment consisting of solution annealing, cooling at a constant rate and stabilisation annealing. The microstructure of the heat-treated alloys consists of equiaxed alpha 2(Ti3Al) + gamma(TiAl) lamellar grains surrounded by gamma grain boundaries with a small amount of beta/B2 particles. The alpha 2-alpha 2 interlamellar spacing lambda decreases with increasing carbon content until a solubility limit of carbon is achieved. The increase in carbon content above the solubility limit leads to the formation of primary Ti2AlC particles during solidification and an increase in the amount of gamma phase at grain boundaries. Vickers microhardness of lamellar grains depends on the carbon content and interlamellar spacing lambda. The studied Ti-45Al-2W-0.8C and Ti-45Al-2W-1.2C alloys show improved creep resistance at 800 degrees C compared to that of the reference carbon-free TiAl-W and carbon-containing TiAl-Nb based alloys with fully lamellar, nearly lamellar, convoluted or pseudo-duplex microstructure.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

—

Návaznosti

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Intermetallics

ISSN

0966-9795

e-ISSN

1879-0216

Svazek periodika

148

Číslo periodika v rámci svazku

SEP 2022

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

11

Strana od-do

nestrankovano

Kód UT WoS článku

000820167800001

EID výsledku v databázi Scopus

2-s2.0-85132900402