Plastic Deformation of Materials

Single crystalline copper beams with thicknesses between 0.7 and 5 μm are manufactured with a focused ion beam technique and bent in a nanoindenter. The yield strengths of the beams show a mechanical size effect (smaller-is-stronger). [more]
One of the key players that controls hardening and fracture toughness of AHS steels is the crystallographic character distribution and morphology of grain and phase boundaries. This project aims at understanding and optimizing crystallographic, morphological, and chemical properties of such boundaries in AHS steels in order to improve the mechanical behavior of the material. [more]
ECCI and XR-EBSD is applied to study the grown-in dislocations at interdendritic boundaries of a nickel based single crystal superalloy and their evolution during creep. [more]
Solar thermal power plants transform the sun light collected by large mirrors into thermal energy. The high amount of energy concentrated in the mirror focus is transferred, in an absorber block, to liquid salt circulating through pipes of steel or superalloys. Liquid salt corrodes, in particular, the grain boundaries of these material. Understanding and controlling grain boundary corrosion in molten salt is, therefore, crucial. [more]
This article reviews continuum-based variational formulations for describing the elastic–plastic deformation of anisotropic heterogeneous crystalline matter. These approaches, commonly referred to as crystal plasticity finite element models, are important both for basic microstructure-based mechanical predictions as well as for engineering design and performance simulations involving anisotropic media. Besides the discussion of the constitutive laws, kinematics, homogenization schemes, and multiscale approaches behind these methods we also present some examples including in particular comparisons of the predictions with experiments. [more]
Creep of single crystal superalloys is governed by dislocation glide, climb, reactions, and annihilation. We use discrete 3D dislocation dynamics (DDD) simulations to study the evolution of the dislocation substructure in a γ/γ’ microstructure of a single crystal superalloy for different climb rates and loading conditions. [more]
We present crystal plasticity finite element simulations of plane strain compression of α-brass single crystals with different initial orientations. The aim is to study the fundamentals of mesoscale structure and texture development in fcc metals with low stacking fault energy (SFE). [more]
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