What Is Thermo-Calc?
Thermo-Calc is the world’s leading computational thermodynamics software for materials science and engineering. Developed by Thermo-Calc Software AB (Sweden), it has been in continuous development for over 30 years and is now used in more than 60 countries by materials scientists, metallurgists, alloy developers, and process engineers.
The software is built on the **CALPHAD methodology** (CALculation of PHAse Diagrams) — a scientifically rigorous approach that uses critically assessed thermodynamic databases to predict phase stability, composition, and material properties across a wide range of temperatures, pressures, and alloy compositions.
**Thermo-Calc 2026a** is the latest release, published January 21, 2026, introducing a powerful Aqueous Calculator for corrosion analysis, Pourbaix diagrams, Electron Beam Melting (EBM) support in the Additive Manufacturing Module, eight updated databases, and numerous interface improvements.
The software has been cited in over **50,000 peer-reviewed journal articles** and more than **1,000 patent applications** — making it not just a tool but a scientific standard in computational materials engineering.
Who Uses Thermo-Calc?
– **Alloy developers** designing new steel grades, nickel superalloys, aluminum alloys, or high-entropy alloys
– **Process metallurgists** optimizing steelmaking, casting, and heat treatment conditions
– **Additive manufacturing engineers** modeling laser powder bed fusion (LPBF) and electron beam melting (EBM) processes
– **Corrosion engineers** generating Pourbaix diagrams and aqueous phase stability maps
– **Academic researchers** publishing CALPHAD-based phase equilibria studies
– **Battery material scientists** developing cathode and electrolyte compositions for Li-ion systems
– **Aerospace engineers** qualifying materials for high-temperature structural applications
What’s New in Thermo-Calc 2026a
Aqueous Calculator (New)
The most significant new addition is a dedicated Aqueous Calculator for corrosion and electrochemical applications. It enables calculation of **Pourbaix diagrams** (E-pH diagrams) that map phase stability regions as a function of electrochemical potential and pH. This is critical for corrosion engineering, materials selection in aqueous environments, and hydrometallurgy applications.
Electron Beam Melting (EBM) in the AM Module
The Additive Manufacturing Module now supports EBM process simulation alongside the existing laser powder bed fusion (LPBF) capability. EBM is widely used for titanium and nickel superalloy components in aerospace and biomedical applications.
User-Friendly Phase Names in Plots and Tables
Phase names in output diagrams now display in human-readable format by default, reducing the need to cross-reference cryptic database phase identifiers with actual material phases.
Eight New and Updated Databases
Eight databases received major updates in this release, covering steels, nickel alloys, titanium systems, and aqueous chemistry. Database quality directly determines prediction accuracy in CALPHAD calculations.
Core Calculators (Included in All Licenses)
Equilibrium Calculator
The foundational tool — calculates the thermodynamic equilibrium state of a defined system at specified temperature, pressure, and composition. Outputs include stable phases, their amounts and compositions, and thermodynamic properties (Gibbs energy, enthalpy, entropy, heat capacity).
Phase Diagram Calculator
Generates binary and ternary phase diagrams, the core deliverable for alloy development and process design. Phase diagrams show which phases are stable as a function of temperature and composition.
Property Diagram Calculator
Calculates thermodynamic and physical properties (fraction of phases, driving force for precipitation, liquidus/solidus temperatures) as a function of a single variable — typically temperature or composition.
Scheil-Gulliver Solidification Simulator
Models non-equilibrium solidification under the Scheil-Gulliver assumptions (no back-diffusion in solid, complete mixing in liquid). Essential for predicting microsegregation, solidification range, and the formation of detrimental secondary phases during casting or welding.
Material to Material Calculator
Examines the thermodynamic transition between two different alloy compositions — useful for modeling welding joints, diffusion couples, and coating-substrate interfaces.
Aqueous Calculator (New in 2026a)
Generates Pourbaix diagrams and calculates phase stability in aqueous systems as a function of pH and electrochemical potential.
Add-on Modules
Thermo-Calc’s core platform can be extended with specialized modules for advanced simulation:
Diffusion Module (DICTRA)
Simulates **diffusion-controlled phase transformations** in multicomponent alloys. Applications include:
– Heat treatment optimization (carburization, nitriding, annealing)
– Microsegregation during solidification
– Growth and dissolution of precipitates
– Homogenization of cast alloys
– Coarsening kinetics
DICTRA uses mobility databases (MOB-series) in conjunction with thermodynamic databases to simulate time-dependent diffusion in realistic alloy systems.
Precipitation Module (TC-PRISMA)
Simulates **multi-particle precipitation kinetics** in multicomponent alloy systems — nucleation, growth, and coarsening of precipitate populations over time. Critical for aging treatment design in aluminum alloys, nickel superalloys, and high-strength steels.
Process Metallurgy Module
Designed for steelmakers and process metallurgists. Models thermodynamic equilibria in steel-slag systems during secondary metallurgy operations: EAF tapping, ladle furnace refining, vacuum degassing, and final treatment. Used by steel plants for real-time process simulation.
Additive Manufacturing (AM) Module
Predicts temperature distribution and melt pool geometry during laser powder bed fusion (LPBF) and electron beam melting (EBM) as a function of process parameters (laser power, scan speed, hatch spacing). Helps engineers understand microstructure evolution and optimize build parameters without expensive physical trials.
Property Model Libraries
Specialized property models for specific alloy families:
– **Steel Model Library** — strength, hardness, martensite start temperature, and more for steels
– **Nickel Model Library** — γ/γ’ solvus, creep properties for Ni superalloys
– **Titanium Model Library** — α/β phase fractions and transformation for Ti alloys
– **Noble Metal Alloys Library** — for precious metal systems
Databases
Thermo-Calc requires at least one thermodynamic database to perform calculations. Over **40 databases** are available, developed using the CALPHAD methodology by expert assessors:
| Database Series | Coverage |
|—————-|———|
| TCFE (Steel & Fe-alloys) | Iron-based alloys, steels, cast iron |
| TCNI (Nickel alloys) | Nickel superalloys, γ/γ’ systems |
| TCAL (Aluminum alloys) | Al-Si, Al-Cu, Al-Mg, Al-Zn systems |
| TCTI (Titanium alloys) | α, β, α+β titanium alloys |
| TCHEA (High Entropy Alloys) | Multi-principal element alloys |
| TCOX (Oxides/Slags) | Oxide, slag, and ceramic systems |
| TCAQ (Aqueous) | Aqueous solutions and corrosion |
| TCMG (Magnesium alloys) | Mg-Al, Mg-Zn, Mg-RE systems |
Each database is sold separately or in bundles. The choice of database determines what materials systems you can simulate accurately.
Software Development Kits (SDKs)
Thermo-Calc can be integrated into external workflows through three SDK options:
TC-Python** — A Python API that allows full access to Thermo-Calc calculations from Python scripts. The most popular option for research, automation, and integration with data science workflows (NumPy, pandas, matplotlib). Runs on Windows, Linux, and macOS.
TC-Toolbox for MATLAB** — Direct integration with MATLAB for engineers working in simulation environments that use MATLAB as their primary platform.
TQ-Interface** — A Fortran/C/C++ interface for embedding Thermo-Calc calculations in legacy simulation codes and commercial FEM/CFD software packages.
Thermo-Calc vs. Competing Software
| Feature | Thermo-Calc 2026a | FactSage 8 | Pandat 2024 |
|———|——————|———–|————|
| CALPHAD methodology | ✅ | ✅ | ✅ |
| Phase diagram calculation | ✅ | ✅ | ✅ |
| Scheil solidification | ✅ | ✅ | ✅ |
| Diffusion simulation (DICTRA) | ✅ | ❌ | ✅ (PanDiffusion) |
| Precipitation kinetics | ✅ TC-PRISMA | ❌ | ✅ PanPrecipitation |
| Additive Manufacturing Module | ✅ | ❌ | ❌ |
| Aqueous/Pourbaix (2026a) | ✅ New | ✅ | Limited |
| Process Metallurgy Module | ✅ | ✅ (FactSage strength) | ❌ |
| Python API | ✅ TC-Python | Limited | ✅ |
| Database breadth | 40+ databases | 40+ databases | 20+ databases |
| Platform | Win/Linux/macOS | Windows only | Windows only |
| Academic free version | ✅ | ❌ | ❌ |
| Citations in literature | 50,000+ | ~15,000+ | ~5,000+ |
When to choose Thermo-Calc:** You need the broadest database coverage, diffusion/precipitation kinetics alongside thermodynamics, Python automation, cross-platform support, or you are publishing academic work where citation weight matters.
When FactSage is preferred:** Your work is heavily focused on oxide, slag, and process metallurgy systems — FactSage’s oxide databases and process reactor calculations are a recognized strength.
When Pandat is considered:** Your team is already invested in the Pandat ecosystem, or you need tight integration with specific casting simulation codes that have Pandat coupling built in.
License Types
Thermo-Calc uses a modular licensing model. You purchase the base software plus the databases and modules you need.
Academic / Educational License
A free limited version (Educational Package) is available for universities teaching undergraduate courses. It supports calculations with up to 3 components and includes demo databases. Full academic licenses with discounted pricing are available for research institutions through the Academic Network Site Package (ANSP).
Commercial Single-User License
Standard license for industry users. Tied to a single machine or user account. Includes Maintenance and Support Subscription for updates and technical support.
Floating / Network License
For teams sharing access across multiple workstations. The license server manages concurrent usage across the network.
Subscription (Annual)
All commercial licenses require an active Maintenance and Support Subscription to receive version updates (including 2026a) and access technical support. Licenses without an active subscription continue to work but are locked to the version at expiry.
Thermo-Calc is one of the few materials simulation tools with native Linux and macOS support alongside Windows — important for research groups running calculations on Linux clusters or macOS workstations.
Frequently Asked Questions
Is there a free version of Thermo-Calc?
Yes — the Educational Package is free for universities. It handles up to 3 components and includes demo databases. It is sufficient for learning CALPHAD concepts but not for real alloy design work, which typically requires 5–15 component systems.
What databases do I need for steel calculations?
The TCFE series (currently TCFE13) is the standard for iron-based alloys and steels. For diffusion calculations in steels, you also need the MOBFE mobility database. For process metallurgy (slag systems), add TCOX.
Can Thermo-Calc run on a Linux server without a display?
Yes. TC-Python can run headlessly on Linux servers for batch calculations — no graphical interface is required. This is widely used for high-throughput CALPHAD screening and integration with HPC clusters.
How does Thermo-Calc handle high-entropy alloys (HEA)?
The TCHEA database is specifically designed for multi-principal element alloys. It covers major HEA systems including CrMnFeCoNi (Cantor alloy) and related compositions. The database is regularly updated as new experimental data becomes available.
What is the difference between DICTRA and TC-PRISMA?
DICTRA (Diffusion Module) simulates diffusion in a 1D geometry — useful for carburization profiles, homogenization, and interface migration. TC-PRISMA (Precipitation Module) simulates the statistical evolution of a population of precipitate particles — useful for aging treatments and precipitation hardening design. They address different but complementary aspects of kinetics.
Can Thermo-Calc import experimental data for database assessment?
Yes. Thermo-Calc includes a PARROT module for thermodynamic database optimization — fitting model parameters to experimental data. This is used by database developers and advanced researchers performing CALPHAD assessments of new systems.
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Summary
Thermo-Calc 2026a is the most comprehensive computational thermodynamics platform available for materials science and engineering. Its combination of a mature CALPHAD engine, the broadest database portfolio in the industry, specialized kinetic modules (DICTRA, TC-PRISMA), and a modern Python API makes it the reference tool for alloy design, process optimization, and materials research worldwide.
The 2026a release strengthens its position in corrosion engineering with the new Aqueous Calculator and Pourbaix diagram capability, and expands additive manufacturing support with EBM process simulation.
For assistance with Thermo-Calc licensing, database selection, or technical setup, contact our team via Telegram: t.me/DoCrackMe
