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Fracture in aluminum alloys with precipitates involves at least twomechanisms, namely, ductile fracture of the aluminum-rich matrix and brittlefracture of the precipitates. In this work, a coupled crystal plasticity-phasefield model for mixed ductile-brittle failure modes is formulated and used toinvestigate the effect of precipitate morphology and size distribution ondamage evolution in aluminum alloys. A thermodynamically consistent frameworkfor elastic and plastic work dissipation in the fracture process zone is usedto formulate the coupled constitutive behavior for brittle and ductile damage,respectively. Representative Volume Elements (RVE) with varying particlemorphology and orientation were generated and their uni-axial loading wassimulated to assess the damage resistance of the different modelmicrostructures. For critical energy release rate $G_c$ values of the aluminummatrix ranging from 4 to 8~Jm$^{-2}$ for single crystals and from 10 to16~Jm$^{-2}$ for polycrystals, the model predicts a change in failure modesfrom particle debonding to cracking followed by ductile matrix failure. Thechange of particle failure mechanism as a result of increased $G_c$ is observedfor both, single and polycrystalline model microstructures. For the case ofparticle debonding, microstructures with circular or ellipsoidal particles(with the major axis perpendicular to the loading direction) show a higherductility and fracture work compared to the other studied cases. In the case ofparticle cracking, microstructures with ellipsoidal particles aligned parallelto the loading axis show a higher ductility and fracture work among theinvestigated cases. The simulations qualitatively reproduce the experimentallyobserved particle failure mechanisms (cracking and debonding) for two differentmatrix alloy classes (commercially pure and 2xxx alloys) reinforced withceramic particles.

Phase-Field Modeling of Coupled Brittle-Ductile Fracture in Aluminum Alloys