English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The effect of Al content on the microstructure of Ti-xAl-8Nb-3.6C-0.8Mo (at.%) composites reinforced with carbide particles, where x = 38, 42, 45, and 47 at.%, was studied. The composites prepared by vacuum induction melting in graphite crucibles followed by centrifugal casting into graphite moulds were studied in the as-cast and heat-treated state. The intermetallic matrices of the as-cast composites consisting of α2(Ti3Al)-, γ(TiAl)-, and β/B2(Ti)-phases are reinforced with uniformly distributed carbide particles composed of (Ti,Nb)2AlC-phase and small amount of (Ti,Nb)C-phase preserved in the cores of some coarse irregular shaped carbides. The increasing Al content leads to a decrease in the volume fraction of β/B2-phase and an increase in the volume fraction of the lamellar α2 + γ and single γ-phase regions in the as-cast composites. The increasing Al content increases shape factor and decreases the mean size of the primary carbide particles. In the heat-treated composites, the intermetallic matrices change from multiphase composed of lamellar α2 + γ grains with β/B2-and γ-phase regions formed along the lamellar grain boundaries, through nearly lamellar to single γ-phase with increasing Al content. The (Ti,Nb)C regions in the core of some carbide particles transform to (Ti,Nb)2AlC-phase during the heat-treatment. The Vickers hardness and matrix microhardness decrease with the increasing Al content in both the as-cast and heat-treated composites. K e y w o r d s: intermetallics, TiAl, composites, casting, microstructure, hardness

Effect of Al content on microstructure of Ti-Al-Nb-C-Mo composites reinforced with carbide particles