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Diffusion in the Ti-Al-V System
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.ORCID iD: 0000-0003-4221-8510
NIST, Mat Sci & Engn Div, 100 Bur Dr, Gaithersburg, MD 20899 USA..
Ohio State Univ, Dept Mat Sci & Engn, Columbus, OH 43210 USA..
NIST, Mat Measurement Sci Div, 100 Bur Dr, Gaithersburg, MD 20899 USA..
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2018 (English)In: JOURNAL OF PHASE EQUILIBRIA AND DIFFUSION, ISSN 1547-7037, Vol. 39, no 5, p. 731-746Article in journal (Refereed) Published
Abstract [en]

Diffusion in the Ti-Al-V system is studied and a CALculation of Phase Diagrams (CALPHAD) diffusion mobility description is developed. Diffusion couple experiments are performed to obtain diffusion paths in the hcp phase at 923 K, 1023 K and 1123 K. The diffusion coefficient of V in the hcp-Ti phase is found to decrease with increasing Al alloying. A forward-simulation analysis is used to evaluate the impurity diffusion coefficient for Al and V diffusion in the hcp Ti-V and the Ti-Al systems which are used as input in the mobility modeling. The composition dependency for the diffusion in the hcp phase in the ternary system is accounted for and a CALPHAD diffusion mobility description is obtained by directly optimizing the mobility parameters as a function of the experimental composition profiles from the diffusion couples. Both experimental data and previous diffusion mobility descriptions in the literature for the bcc Ti-Al-V phase are adopted. A complete description of diffusion in both the hcp and bcc phases for the Ti-Al-V system is presented with the aim to be used for design of Ti alloys and processes.

Place, publisher, year, edition, pages
Springer, 2018. Vol. 39, no 5, p. 731-746
Keywords [en]
CALPHAD, diffusion couples, diffusion modeling, interdiffusion, Ti-Al-V
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-236005DOI: 10.1007/s11669-018-0673-9ISI: 000444765000024Scopus ID: 2-s2.0-85052655219OAI: oai:DiVA.org:kth-236005DiVA, id: diva2:1255936
Note

QC 20181015

Available from: 2018-10-15 Created: 2018-10-15 Last updated: 2018-12-03Bibliographically approved

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