Mobility Database

PanMo2026_MB is an atomic mobility database for Mo-based alloys, which is compatible with the PanMo2026_TH thermodynamic database and suitable for the simulation of diffusion-controlled phenomena using the PanDiffusion module, PanEvolution module, and/or  PanSolidification  module.

Phases

The atomic mobility within the Liquid, Bcc, Fcc, and Hcp solution phases are assessed in this database.

Self-diffusivity of Pure Elements

The color represents the following meaning:

Table 1: Assessed self-diffusivity of pure elements with different crystal structures

Assessed Systems

In addition to the assessed self-diffusivities shown above, the impurity diffusion data for all elements included in the current PanMo2026_MB mobility database are also assessed. Moreover, chemical-diffusivities available in some binary and ternary systems are also used to assess the interaction parameters. These binary and ternary systems are listed below for the Bcc, Fcc, and Hcp phases, respectively.

Fcc Phase

Bcc phase

Database Validation

The simulated concentration profiles of a series of Mo-based alloys are shown below to validate the current PanMo_MB database.

Figure 2.1: Inter-diffusion coefficients of Ta in bcc Mo-Ta binary alloys [2012Liu]

Figure 2.2: Inter-diffusion coefficients of W in bcc Mo-W binary alloys [2012Liu]

Figure 2.3: Tracer diffusion of Mo in bcc Mo-Zr alloys at different temperatures [2013Liu]

[2012Liu] Y. Liu, et al., Diffusion characteristics and atomic mobilities for bcc refractory Mo-Ta, Mo-W, and Mo-Nb alloys. Calphad, 2012. 36: p. 110-117.

[2013Liu] Y. Liu, et al., Mobilities and diffusivities for bcc Nb-W, Nb-Ta, Zr-Mo and Zr-Hf alloys. Journal of Alloys and Compounds, 2013. 555: p. 381-389.