Aluminium-based alloys

Our CALPHAD based software and databases allow a high fidelity calculation of phase equilibria in multicomponent Al-based alloy systems and provide an efficient way to design and optimise materials chemistry and processing for obtaining desired microstructure and properties.

By using Thermo-Calc and compatible thermodynamic databases, a vast amount of information can be obtained of relevance for multicomponent Al-based alloys.

Examples of properties that can be predicted:

  • Phase amount and constitution as a function of composition
  • Phase amount and constitution as a function of temperature
  • Liquidus, solidus and other phase transformation temperatures
  • Solubility of alloy elements in Al
  • Partitioning of alloying elements among different phases
  • Enthalpy, heat capacity, driving force for phase nucleation and growth
  • Lattice parameter, density, coefficient of thermal expansion and volume

During casting, welding and joining of Al alloys, the solidification of the alloys happens almost entirely in a non-equilibrium way. The non-equilibrium solidification path can be predicted rather accurately by using the Scheil-Gulliver module available in Thermo-Calc.

From a multicomponent Scheil-Gulliver calculation, one can obtain:

  • Solidification temperature range
  • Incipient melting point
  • Phase amount and its composition
  • Phase formation sequence
  • Micro-segregation of solute elements
  • Latent heat evolution
  • Density variation and volume shrinkage

By using the Diffusion module (DICTRA) and combining both thermodynamic and kinetic databases, typical diffusion-controlled phase transformations in Al-alloys can be simulated under arbitrary heat treatment conditions.

Examples of applications that can be studied using the Diffusion module (DICTRA) include:

  • Growth or dissolution of intermetallic phases
  • Cooling effects in solidification
  • Homogenisation of as-cast alloys
  • Coarsening of precipitate phases

By using the Precipitation module (TC-PRISMA) and combining thermodynamic and kinetic databases, the concurrent nucleation, growth and coarsening of precipitates can be simulated.

Precipitation module (TC-PRISMA) simulation results include the temporal evolution of:

  • Mean radius 
  • Number density
  • Volume fraction
  • Particle size distribution