Phase Transformations upon Ageing in Ti15Mo Alloy Subjected to Two Different Deformation Methods

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F21%3A10431946" target="_blank" >RIV/00216208:11320/21:10431946 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21220/21:00356233

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=5eq7x~XXFO" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=5eq7x~XXFO</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/met11081230" target="_blank" >10.3390/met11081230</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Phase Transformations upon Ageing in Ti15Mo Alloy Subjected to Two Different Deformation Methods

Popis výsledku v původním jazyce

Ti15Mo alloy was subjected to two techniques of intensive plastic deformation, namely high pressure torsion and rotary swaging at room temperature. The imposed strain resulted in the formation of an ultrafine-grained structure in both deformed conditions. Detailed inspection of the microstructure revealed the presence of grains with a size of around 100 nm in both conditions. The microstructure after rotary swaging also contained elongated grains with a length up to 1 mu m. Isothermal ageing at 400 degrees C and 500 degrees C up to 16 h was applied to both conditions to investigate the kinetics of precipitation of the alpha phase and the recovery of lattice defects. Positron annihilation spectroscopy indicated that the recovery of lattice defects in the beta matrix had already occurred at 400 degrees C and, in terms of positron trapping, was partly compensated by the precipitation of incoherent alpha particles. At 500 degrees C the recovery was fully offset by the formation of incoherent alpha/beta interfaces. Contrary to common coarse-grained material, in which the alpha phase precipitates in the form of lamellae, precipitation of small and equiaxed alpha particles occurred in the deformed condition. A refined two-phase equiaxed microstructure with alpha particles and beta grain sizes below 1 mu m is achievable by simple rotary swaging followed by ageing.

Název v anglickém jazyce

Phase Transformations upon Ageing in Ti15Mo Alloy Subjected to Two Different Deformation Methods

Popis výsledku anglicky

Ti15Mo alloy was subjected to two techniques of intensive plastic deformation, namely high pressure torsion and rotary swaging at room temperature. The imposed strain resulted in the formation of an ultrafine-grained structure in both deformed conditions. Detailed inspection of the microstructure revealed the presence of grains with a size of around 100 nm in both conditions. The microstructure after rotary swaging also contained elongated grains with a length up to 1 mu m. Isothermal ageing at 400 degrees C and 500 degrees C up to 16 h was applied to both conditions to investigate the kinetics of precipitation of the alpha phase and the recovery of lattice defects. Positron annihilation spectroscopy indicated that the recovery of lattice defects in the beta matrix had already occurred at 400 degrees C and, in terms of positron trapping, was partly compensated by the precipitation of incoherent alpha particles. At 500 degrees C the recovery was fully offset by the formation of incoherent alpha/beta interfaces. Contrary to common coarse-grained material, in which the alpha phase precipitates in the form of lamellae, precipitation of small and equiaxed alpha particles occurred in the deformed condition. A refined two-phase equiaxed microstructure with alpha particles and beta grain sizes below 1 mu m is achievable by simple rotary swaging followed by ageing.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

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

2021

Kód důvěrnosti údajů

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

Název periodika

Metals [online]

ISSN

2075-4701

e-ISSN

—

Svazek periodika

11

Číslo periodika v rámci svazku

8

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

11

Strana od-do

1230

Kód UT WoS článku

000689397000001

EID výsledku v databázi Scopus

2-s2.0-85111450628