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A machine‐learning interatomic potential for Mo–Si alloys based on the atomic cluster expansion formalism is presented, its performance is validated, and it is applied for studying interface phenomena. Structural parameters, elastic constants, and melting temperatures of the crystalline body‐centered cubic Mo, diamond Si, and stable Mo–Si alloys (Mo₃Si, Mo₅Si₃, and MoSi₂) are calculated and compared to experimental values. Using the trained potential defect, formation energies are calculated and the thermodynamic stability of various MoxSiy alloys is discussed with focus on Mo₃Si. Finally, the intermixing between Mo and Si phases is studied by performing interface simulations of Mo|Si. The crystallization behavior of the Mo₃Si phase provides additional evidence for the off‐stoichiometric composition of this intermetallic phase.

Special Issue: Materials Compounds from Composite Materials for Applications in Extreme Conditions