The effect of ageing on microstructure and microhardness of fully lamellar Ti-45Al-5Nb-0.2B-0.75C alloy
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27360%2F15%3A86096272" target="_blank" >RIV/61989100:27360/15:86096272 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
The effect of ageing on microstructure and microhardness of fully lamellar Ti-45Al-5Nb-0.2B-0.75C alloy
Original language description
The effect of ageing on microstructure and Vickers microhardness of fully lamellar Ti-45Al-5Nb-0.2B0.75C (at.%) alloy was studied. The experimental procedure for preparation of the studied alloy included induction melting of pure elements, centrifugal casting of cylindrical bars and hot isostatic pressing of the bars to eliminate porosity. A fully lamellar γ(TiAl)/α2(Ti3Al) microstructure of the samples was achieved by the heat treatment consisting of solid solution annealing in a single α phase field followed by the cooling to room temperature. The ageing experiments were performed at three different temperatures of 750, 850 and 950 °C up to 650h in protective argon atmosphere. During the ageing the Vickers microhardness first increases with increasing ageingtime and after reaching maximum values it decreases. The microstructure analysis by optical microscopy, scanning electron microscopy and X-ray diffraction analysis (XRD) show that the variations of measured microhardness values with the ageing time are connected with precipitation hardening. The peak microhardness values measured in the samples aged at 950 °C for 8 h are connected with the precipitation of carbides mainly of Ti2AlC type. The age softening observed after the ageing at 950 °C for 650 h results from the coarsening of the carbides and partial dissolution of the α2 lamellae.
Czech name
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Czech description
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Classification
Type
D - Article in proceedings
CEP classification
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OECD FORD branch
20501 - Materials engineering
Result continuities
Project
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Continuities
N - Vyzkumna aktivita podporovana z neverejnych zdroju
Others
Publication year
2015
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
METAL 2015 : 24th International Conference on Metallurgy and Materials : conference proceedings : June 3rd-5th 2015, Hotel Voroněž I, Brno, Czech Republic, EU
ISBN
978-80-87294-62-8
ISSN
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e-ISSN
neuvedeno
Number of pages
6
Pages from-to
1405-1410
Publisher name
Tanger
Place of publication
Ostrava
Event location
Brno
Event date
Jun 3, 2015
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
000374706100227