Coarsening Nickel Property Model Settings

The Subset of phases setting allows you to select a subset of phases relevant to the material type under investigation. The purpose is to consider only phases relevant to typical commercial Ni-base alloys, for example it excludes the eta and delta phases that are normally thermodynamically stable at heat treatment temperatures but rarely form in practice due to their slow formation. Select one of these options to include the specified phases in the calculation:

• All phases: To include all phases in the current system.
• Gamma and gamma prime only (γ and γ' only): To include only disordered FCC (γ) and L12 ordered FCC (γ').

  For the Coarsening - Ni Property Model, you select Gamma and selected precipitate(s) instead and it still includes only disordered FCC (γ) and L12 ordered FCC (γ').

  For Solvus for Ordered Phases - Ni and Strain-Age Cracking - Ni, this option is Gamma + Gamma Prime.

• Typical Ni-base superalloy: To include phases typically present in Ni-base superalloys, i.e. liquid, gamma (γ), gamma prime (γ'), gamma double prime (γ") and carbides (FCC_L12#3, HCP_A3#1, HCP_A3#2, M23C6, M6C, M7C3) along with some additional phases (BCC_A2, BCC_A2#2, BCC_B2, BCC_B2#2, BCT_D022, NI3B_D011, M2B_TETR, D5A_M3B2, M3B2, MB_B33, MB2_C32, G_PHASE, NI5ZR, NI7ZR2, CR3NI5SI2, CR3NI5SI2, SPINEL, ALPHA_SPINEL, CORUNDUM).
• Typical Ni-base superalloy plus eta and delta: To include the phases listed above for a Typical Ni-base superalloy plus eta (η) (NI3TI_D024) and delta (δ) (NI3TA_D0A) phases.
• Typical Ni-base superalloy plus TCP phases: To include the phases listed above for a Typical Ni-base superalloy plus topologically close packed (TCP) phases. TCP phases are laves (C14_LAVES), sigma (σ) (SIGMA), mu (μ) (MU_PHASE), R (R_PHASE), P (P_PHASE), Z (Z_PHASE) and CR3SI (CR3SI_A15).

This setting is NOT available if Gamma and selected precipitate(s) is selected.

Select an Equilibrium minimization strategy. The default uses the Global test preferred option. For this Property Model, and for either Global option, also enter the Max number of global gridpoints, where the default is 20000.

The Minimization Strategy setting is used to ensure that the most stable minimum under the specified conditions is computed.

With either the Global test preferred or Local minimization preferred setting, the program cycles through options before it gives up:

• For Global test preferred the minimization starts with a global test and if that fails it runs full global minimization.
• For Local minimization preferred the minimization starts with a local minimization, in case of failure it tries a global test and finally a full global minimization.

If you choose Local minimization only or Global minimization only, the program just tries the one setting and gives up if it fails.

For general information about global minimization, see the topic related to the Console Mode command, GLOBAL_MINIMIZATION.

Choose a Matrix phase. The default is Gamma (γ).

Choose a Precipitate phase to calculate its coarsening rate. Click the Add phase button to add another Precipitate phase. Click the Remove phase button to remove a phase.