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The role of randomly packed particles on macroscopic elastic bonded grain properties
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On the origin of internal obstacles to dislocation glide in single-phase NiFe random alloys
Over the past decade, a new class of unconventional alloys, where several constitutive elements are presented in close to equal concentrations, is considered as promising structural materials in many applications. Properties and behavior of many concentrated solid solution alloys (CSSAs) under different conditions, including mechanical loading, differs from that of conventional alloys and has been the subject of intensive studies by different techniques. A key feature of these materials is that there is no clear distinction between solute and solvent species of atoms, which is the conventional approach to considering dislocation motion in alloys. To understand this regime, we have recently reported on the glide of a screw dislocation glide in a simple equiatomic NiFe alloy and reported the two-mode character. At low applied stress, the dislocation motion is similar to a glide through a field of obstacles. In this work, we report the results of a detailed study on the nature of these internal obstacles. We demonstrate that these are not conventional localized “obstacles” but is the result of significantly different energies of instantaneous dislocation configurations over the alloy bulk. The strong pinning positions are associated with composition changes in the partial dislocation cores, while observing no significant composition changes along the stacking faults. Local energies can vary significantly, as demonstrated using simulations of short-periodicity dislocation lines. Therefore, the critical stress to move a dislocation under such conditions is not a constant Peierls stress but represents a wide spectrum of barriers between different non-straight valleys that the dislocation line accommodates in the bulk at particular stress/strain conditions.
Ni solute segregation and associated plastic deformation mechanisms into random FCC Ag, BCC Nb and HCP Zr polycrystals
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Coarse mesh finite difference acceleration of the random ray method
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Effects of In-Bed Cycle Exercise in Patients With Acute Stroke: A Randomized Controlled Trial
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Random forest regression feature importance for climate impact pathway detection
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Randomized physics-informed neural networks for Bayesian data assimilation
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Towards random generation of microstructures of spatially varying materials from orthogonal sections
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Factors affecting the vacancy formation energy in Fe70Ni10Cr20 random concentrated alloy
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Efficient structure-informed featurization and property prediction of ordered, dilute, and random atomic structures
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Simulating trapping sites with accelerated random diffusion methods
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