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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

  • DOI - Digital Object Identifier

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

  • Czech description

Classification

  • Type

    D - Article in proceedings

  • CEP classification

  • OECD FORD branch

    20501 - Materials engineering

Result continuities

  • Project

  • 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

  • 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