1. Mobility Database of Ti-
Alloys
PanTi2020_MB is an atomic mobility database for Ti-based alloys, which is
compatible with the PanTi2020_TH and PanTiAl2020_TH thermodynamic
databases and suitable for the simulation of diffusion controlled phenomena
using the PanDiffusion module, PanPrecipitation module, and/or
PanSolidification module.
1.1 Components (20)
Al
B
C
Cr
Cu
Fe
H
Mn
Mo
N
Nb
Ni
O
Si
Sn
Ta
Ti
V
W
Zr
1.2 Phases
The atomic mobility within the Liquid, Bcc, Fcc, and Hcp solution phases are
assessed in this database.
1.3 Self-diffusivity of Pure Elements
The color represents the following meaning:
: Validated
: Estimated
: No data
Table 1.1: Assessed self-diffusivity of pure elements with different crystal structures: Bcc, Fcc,
and Hcp
Al
Cr
Fe
M
n
M
o
Ni
Si
Sn
Ta
V
W
Zr
Bcc
Fcc
Hcp
1.4 Assessed Systems
In addition to the assessed self-diffusivities shown above, the impurity
diffusion data for all included elements in the current PanTi2020_MB database
are also assessed. In the following, the assessed chemical-diffusivity within the
binary and ternary systems for the Bcc and Fcc phases are listed, respectively.
Fcc phase
Al-Si
Al-W
Cr-Ni
Bcc phase
Al-Ti
Cr-Ti
Mo-Nb
Mo-Ta
Mo-Ti
Mo-W
Mo-Zr
Nb-Ta
Nb-Ti
Nb-V
Nb-W
Nb-Zr
Ta-Ti
Ta-W
Ti-V
Ti-Zr
V-Zr
Al-Cr-Ti
1.5 Database Validation
The simulated concentration profiles of a series of Ti-base alloys are shown
below to validate the current PanTi2020_MB database.
Figure 1.1: Concentration profiles of Ti-5.9Al/Ti-4.8Cr (at.%) at 1473K for 18h [1]
Figure 1.2: Concentration profiles of Ti/Ti-7.7Al-7Cr (at.%) at 1473K for 18h [1]
Figure 1.3: Concentration profile of Ti-5V/Ti-15V (at.%) annealed at 1267K for 8h [2]
1.6 References
1. Li, W., et al., Assessment of diffusion mobility for the bcc phase of the Ti-
Al-Cr system. Calphad, 2011. 35: p. 384-390.
2. Liu, Y., et al., Assessment of the diffusional mobilities in bcc Ti-V alloys.
Journal of Alloys and Compounds, 2009. 470: p. 176-182.