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Phase transformations in a heterogeneous Ti-xNb-7Zr-0.8O alloy prepared by a field-assisted sintering technique
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SYSNO ASEP 0555692 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Phase transformations in a heterogeneous Ti-xNb-7Zr-0.8O alloy prepared by a field-assisted sintering technique Author(s) Kozlík, J. (CZ)
Preisler, D. (CZ)
Stráský, J. (CZ)
Veselý, J. (CZ)
Veverková, A. (CZ)
Chráska, Tomáš (UFP-V) RID, ORCID
Janeček, M. (CZ)Number of authors 7 Article number 109308 Source Title Materials and Design. - : Elsevier - ISSN 0264-1275
Roč. 198, January (2021)Number of pages 11 s. Language eng - English Country GB - United Kingdom Keywords Field assisted sintering technique (FAST) ; Gibbs free energy ; Heterogeneity ; Phase transitions ; Titanium alloys Subject RIV JP - Industrial Processing OECD category Materials engineering R&D Projects GA19-11275S GA ČR - Czech Science Foundation (CSF) Method of publishing Open access Institutional support UFP-V - RVO:61389021 UT WOS 000606821600005 EID SCOPUS 85096216727 DOI 10.1016/j.matdes.2020.109308 Annotation Biomedical metastable alloy Ti-xNb-7Zr-0.8O with a compositional gradient of Nb was prepared from elemental powders by a field-assisted sintering technique (FAST). The aim was to investigate phase transformations over a wide range of compositions, facilitating the designing of biomedical Ti alloys. Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) investigations revealed that Nb-rich regions retained the β phase, surrounded by transition region consisting of the β and ω phases, while Nb-lean regions consisted of the α and β phases. The Nb concentration, above which formation of the ω phase occurs during cooling instead of the α phase, was determined to be 22 wt%, an important parameter for the low-modulus alloy design. The paper validates the viability of using FAST to prepare heterogeneous Ti alloys permitting to study microstructure over a wide range of compositions. This technique could also be readily used as a high-throughput method for designing other alloy systems. The experimental results were supplemented by calculation of Gibbs energy curves and schematic phase diagrams, which allowed to explain a competition between α and ω formation depending on alloy composition. Such semi-empirical approach can serve as a useful tool for general alloy design, in particular for biomedical Ti alloys. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2022 Electronic address https://www.sciencedirect.com/science/article/pii/S0264127520308443?via%3Dihub
Number of the records: 1