NUMERICAL SIMULATION OF AL-SI ALLOYS WITH AND WITHOUT A DIRECTIONAL SOLIDIFICATION

Numerical simulation and comparison of a real Al–Si alloy with virtually generated alloys

Mechanical stress–strain curves are estimated by means of numerical simulation in order to analyze and compare the mechanical properties of a real Strontium–modified Al–Si alloy with virtually designed materials. The virtual materials are generated by a competitive stochastic growth model of the 3D coral–like morphology of the eutectic Si in Al–Si alloys. The experimental data for the real mate...

The Mechanical Strength of Si Foams in the Mushy Zone during Solidification of Al–Si Alloys

The mechanical strength of an Al-30% Si alloy in the mushy zone was estimated by using a novel centrifugation apparatus. In the apparatus, the alloy melt was partially solidified, forming a porous structure made of primary Si platelets (Si foam) while cooling. Subsequently, pressure generated by centrifugal force pushed the liquid phase out of the foam. The estimated mechanical strength of the ...

Mathematical and Physical Modelling of Directional Solidification of Aerospace Alloys

Defect formation in aerospace components is studied, particularly in regions of directionally solidified casting with stepwise increase in cross-section, which is a typical geometric configuration for such components as turbine blades. Given the fact that the geometry of a casting is directly related to probability of defect formation, special attention was paid to grain defects in regions of c...

Precipitation Hardening of Al–Si–Mg Alloys

Numerical Simulation and Optimization of Directional Solidification Process of Single Crystal Superalloy Casting

The rapid development of numerical modeling techniques has led to more accurate results in modeling metal solidification processes. In this study, the cellular automaton-finite difference (CA-FD) method was used to simulate the directional solidification (DS) process of single crystal (SX) superalloy blade samples. Experiments were carried out to validate the simulation results. Meanwhile, an i...