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Plasticity in small-sized metallic systems: Intrinsic versus extrinsic size effect

A review of some plasticity and viscoplasticity constitutive theories

Alloy design based on single-principal-element systems has approached its limit for performance enhancements. A substantial increase in strength up to gigapascal levels typically causes the premature failure of materials with reduced ductility. Here, we report a strategy to break this trade-off by controllably introducing high-density ductile multicomponent intermetallic nanoparticles (MCINPs) in complex alloy systems. Distinct from the intermetallic-induced embrittlement under conventional wisdom, such MCINP-strengthened alloys exhibit superior strengths of 1.5 gigapascals and ductility as high as 50% in tension at ambient temperature. The plastic instability, a major concern for high-strength materials, can be completely eliminated by generating a distinctive multistage work-hardening behavior, resulting from pronounced dislocation activities and deformation-induced microbands. This MCINP strategy offers a paradigm to develop next-generation materials for structural applications.

Multicomponent intermetallic nanoparticles and superb mechanical behaviors of complex alloys

High angle boundaries formed by grain subdivision mechanisms

Coupling between experimental measurements and polycrystal finite element calculations for micromechanical study of metallic materials

Simulation of materials processing: theory, methods and applications

On the capabilities of mean-field approaches for the description of plasticity in metal matrix composites

A unified model coupling 3D dislocation dynamics (DD) simulations with the finite element (FE) method is revisited. The so-called Discrete-Continuous Model (DCM) aims to predict plastic flow at the (sub-)micron length scale of materials with complex boundary conditions. The evolution of the dislocation microstructure and the short-range dislocation–dislocation interactions are calculated with a DD code. The long-range mechanical fields due to the dislocations are calculated by a FE code, taking into account the boundary conditions. The coupling procedure is based on eigenstrain theory, and the precise manner in which the plastic slip, i.e. the dislocation glide as calculated by the DD code, is transferred to the integration points of the FE mesh is described in full detail. Several test cases are presented, and the DCM is applied to plastic flow in a single-crystal Nickel-based superalloy.

Modelling crystal plasticity by 3D dislocation dynamics and the finite element method: The Discrete-Continuous Model revisited

http://zig.onera.fr/%7Edevincre/perso_html/Documents/Vattre_09.pdf

Arjen Roos

Papers

Coupling between experimental measurements and polycrystal finite element calculations for micromechanical study of metallic materials

Simulation of materials processing: theory, methods and applications

On the capabilities of mean-field approaches for the description of plasticity in metal matrix composites

Modelling crystal plasticity by 3D dislocation dynamics and the finite element method: The Discrete-Continuous Model revisited

Dislocation dynamics simulations of precipitation hardening in Ni-based superalloys with high γ′ volume fraction