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Showing 1 to 9 of 9 for “"Dislocation slip"”.
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Dislocation slip and twinning stress in shape memory alloys- theory and experiments
Slip and twinning are two important deformation mechanisms governing Shape Memory Alloys (SMAs) plasticity, which results in affecting their pseudoelasticity and shape memory performance. Precisely determining Peierls stress in dislocation slip and critical twin nucleation stress in twinning is …
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Hydrogen segregation, defects, and interactions with dislocations in nickel and aluminum
… and carbon on the activation parameters for dislocation slip in macroscopic nickel tensile specimens. The results show that hydrogen increases the dislocation mobility in Ni and in Ni-H alloys by reducing the activation enthalpy for dislocation motion and carbon reduces the mobility by …
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Characterization of silicon photovoltaic wafers using polarized infrared imaging
… wafers. The measured stress pattern shows that dislocation structures interact with the thermal residual stress, forming slip band structures oriented at 45 degrees to the wafer edges. The measured PE images are then interpreted using a discrete dislocation-based numerical modeling approach that …
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Atomistic simulation of dislocation core structures in B2 NiAl
… the core structures of (100), (110), and (111) dislocations in B2 NiAI has been conducted using atomistic simulations with an embedded atom method (EAM) potential. New flexible boundary conditions and a new method of graphic representation of dislocation core structure have been employed. The …
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Low Energy Order-To-Disorder Transition Pathways In Phase-Change Nanowires
… with a growth direction aligned with the dislocation slip system, have shown that the resistance change occurs by a dislocation-templated amorphization process. However, the resistance switching mechanism in superlattices, which consist of periodically alternating layers of two different …
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Hydrogen-Induced Transformations in Metastable High Entropy Alloys
… just the Mn content enables switching between dislocation slip, twinning, and martensite transformation mechanisms. Thus, in this work, we further explore alloys in the FeMnCoCr system to discover H effects and their interactions with metastability. In the first part of this work, we explore …
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Experimental and Computational Micromechanics of Aluminum Cerium Alloys and Selective Laser Melted 316L Stainless Steel
… caused by the strong [110] texture, optimal for dislocation slip, in the loading direction. The in-situ loading experiments are also able to capture the melt pool track deformation and crack formation that leads to the failure of these samples. This highlights the importance of micromechanical …
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Modeling mechanical properties – linking atomistics to continuum
… alloys demonstrated a competition between slip and twinning based deformations. Depending on the single crystal orientation and loading direction (tension/compression), either mode is activated. A Schmid factor analysis demonstrated that slip or twinning is triggered when the resolved shear …
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Studium dynamiky deformačních procesů ve slitinách Mg-RE pomocí in-situ experimentálních metod
Předložená práce se zabývá studiem dynamiky deformačních procesů binárních slitin Mg-Gd pomocí in-situ experimentálních metod v závislosti na koncentraci Gd. Zkoumané lité slitiny jsou charakterizované náhodnou texturou. Tlakové zkoušky byly provedené se souběžným záznamem akustické emise, ze …