Mobilities of Ti and Fe in disordered TiFe-BCC assessed from new experimental data
(2021) In Calphad: Computer Coupling of Phase Diagrams and Thermochemistry 74.- Abstract
Pure titanium has an HCP structure and lacks mechanical properties for many industrial purposes. The BCC phase of Ti is required to make alloys with increased strength compared to pure Ti. Iron is the most potent element for stabilising the BCC phase. However, the addition of Fe to Ti causes segregation issues during solidification, which can be avoided by diffusion-driven solid-state alloying. To predict the diffusion kinetics, the interaction mobility parameters of Ti and Fe in the disordered BCC phase of Ti are necessary. In this work, these parameters are optimised based on new experimental data from Ti-Fe diffusion couples produced by the Field Assisted Sintering Technology (FAST). Diffusion couples were held at 1173K and 1273K for... (More)
Pure titanium has an HCP structure and lacks mechanical properties for many industrial purposes. The BCC phase of Ti is required to make alloys with increased strength compared to pure Ti. Iron is the most potent element for stabilising the BCC phase. However, the addition of Fe to Ti causes segregation issues during solidification, which can be avoided by diffusion-driven solid-state alloying. To predict the diffusion kinetics, the interaction mobility parameters of Ti and Fe in the disordered BCC phase of Ti are necessary. In this work, these parameters are optimised based on new experimental data from Ti-Fe diffusion couples produced by the Field Assisted Sintering Technology (FAST). Diffusion couples were held at 1173K and 1273K for one hour. High-resolution Fe concentration profiles are obtained from Electron Probe Micro Analyser (EPMA). Ternary mobility interaction parameters are assessed based on binary endmembers with a DICTRA sub-module, and results are compared to earlier assessments of mobilities of the disordered BCC TiFe system.
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- author
- Salmasi, Armin ; Graham, Simon J. ; Galbraith, Iain ; Graves, Alexander D. ; Jackson, Martin ; Norgren, Susanne LU ; Guan, Dikai ; Larsson, Henrik and Höglund, Lars
- organization
- publishing date
- 2021-09-01
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- DICTRA, Disordered BCC titanium iron, EPMA, Machining, Mobility database
- in
- Calphad: Computer Coupling of Phase Diagrams and Thermochemistry
- volume
- 74
- article number
- 102300
- publisher
- Elsevier
- external identifiers
-
- scopus:85109466128
- ISSN
- 0364-5916
- DOI
- 10.1016/j.calphad.2021.102300
- language
- English
- LU publication?
- yes
- id
- 1596af13-ec45-4f2c-9b7f-ca04893cb866
- date added to LUP
- 2021-08-16 14:49:22
- date last changed
- 2022-04-27 03:09:33
@article{1596af13-ec45-4f2c-9b7f-ca04893cb866,
abstract = {{<p>Pure titanium has an HCP structure and lacks mechanical properties for many industrial purposes. The BCC phase of Ti is required to make alloys with increased strength compared to pure Ti. Iron is the most potent element for stabilising the BCC phase. However, the addition of Fe to Ti causes segregation issues during solidification, which can be avoided by diffusion-driven solid-state alloying. To predict the diffusion kinetics, the interaction mobility parameters of Ti and Fe in the disordered BCC phase of Ti are necessary. In this work, these parameters are optimised based on new experimental data from Ti-Fe diffusion couples produced by the Field Assisted Sintering Technology (FAST). Diffusion couples were held at 1173K and 1273K for one hour. High-resolution Fe concentration profiles are obtained from Electron Probe Micro Analyser (EPMA). Ternary mobility interaction parameters are assessed based on binary endmembers with a DICTRA sub-module, and results are compared to earlier assessments of mobilities of the disordered BCC TiFe system.</p>}},
author = {{Salmasi, Armin and Graham, Simon J. and Galbraith, Iain and Graves, Alexander D. and Jackson, Martin and Norgren, Susanne and Guan, Dikai and Larsson, Henrik and Höglund, Lars}},
issn = {{0364-5916}},
keywords = {{DICTRA; Disordered BCC titanium iron; EPMA; Machining; Mobility database}},
language = {{eng}},
month = {{09}},
publisher = {{Elsevier}},
series = {{Calphad: Computer Coupling of Phase Diagrams and Thermochemistry}},
title = {{Mobilities of Ti and Fe in disordered TiFe-BCC assessed from new experimental data}},
url = {{http://dx.doi.org/10.1016/j.calphad.2021.102300}},
doi = {{10.1016/j.calphad.2021.102300}},
volume = {{74}},
year = {{2021}},
}