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Phase separation and up-hill diffusion in the ordered α2 compound of a γ-Ti-Al-Nb alloy
Citation Link: https://doi.org/10.15480/882.4829
Publikationstyp
Conference Paper
Date Issued
2020-10-12
Sprache
English
TORE-DOI
First published in
Number in series
321
Article Number
12041
Citation
MATEC Web of Conferences 321: 12041 (2020)
Contribution to Conference
Publisher DOI
Publisher
EDP Sciences
γ-TiAl alloys are intermetallic materials that are designed for applications in air craft engines. Oftentimes alloying elementsare added to improve the corrosion resistance and mechanical properties. Here we investigate microstructural changes thattake place when Nb is added to a binary γ-TiAl alloy. Previous studies of the alloy Ti-42Al-8.5Nb have shown that uponNb addition the orthorhombic O-phase forms out of the parent α2 phase within the alloy’s microstructure. During annealingNb segregates to the newly formed O-phase while Al and Ti partition to the remaining α2-like matrix phase. The changesthese newly formed O-phase domains undergo with time at elevated temperature are not known. Here we use TransmissionElectron Microscopy techniques to monitor the distribution of Nb and the size of O-phase domains during long-termannealing between 1 week and 4 weeks at 550°C. The results show that the size of O-phase domains shrinks withannealing time. At the same time the Nb concentration remains largely constant or possibly shows a small decrease.
DDC Class
530: Physik
540: Chemie
600: Technik
620: Ingenieurwissenschaften
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