Results 41 to 50 of about 377 (207)

Heterostructure enables new deformation mechanisms to enhance strength and work hardening

Materials Research Letters
Reflection of geometrically necessary dislocations (GNDs) has been reported effective in increasing strength and ductility of dual-phase alloys. However, this mechanism is rarely observed in conventional single-phase alloys. Here we report the activation
Bo Gao, Xinxin Dong, Xuefei Chen, Lirong Xiao, Qi Zhou, Xiaodong Han, Dongdi Yin, Hao Zhou, Yuntian Zhu   +8 more
doaj   +1 more source

In-situ observation of dislocation dynamics near heterostructured interfaces

Materials Research Letters, 2019
There has been a long-standing controversy on how dislocations interact with interfaces. Here we report in-situ observations that in a Cu–brass heterostructured TEM film Frank–Read sources are the primary dislocation sources. They were dynamically formed
Hao Zhou, Chongxiang Huang, Xuechao Sha, Lirong Xiao, Xiaolong Ma, Heinz Werner Höppel, Mathias Göken, Xiaolei Wu, Kei Ameyama, Xiaodong Han, Yuntian Zhu   +10 more
doaj   +1 more source

Fatigue Crack Initiation and Growth in Nanocrystalline Ni at Multiple Length‐Scales

Advanced Engineering Materials, EarlyView.
Overview of miniaturized in situ SEM fatigue setup and resultant fatigue crack growth data for nanocrystalline Ni. The presented study focuses on the analysis of fatigue crack growth rate (FCGR) in focused ion beam‐notched microcantilevers prepared from nanocrystalline (NC) Ni as a model material.
Igor Moravcik, Alexander Jelinek, Markus Alfreider, Jutta Luksch, Anton Hohenwarter, Florian Schaefer, Christian Motz, Daniel Kiener   +7 more
wiley   +1 more source

Observation of the formation and sharpening of geometrically necessary boundaries

Materials Research Letters
We present in-situ visualisation of incidental dislocation boundaries (IDBs) and geometrically necessary boundaries (GNBs) in single-crystal aluminium under tensile load along [111].
Adam André William Cretton, Albert Zelenika, Felix Frankus, Can Yıldırım, Carsten Detlefs, Flemming Bjerg Grumsen, Grethe Winther, Henning Friis Poulsen   +7 more
doaj   +1 more source

Tailoring Functional Properties of Ti–Ni–Cu Shape Memory Alloy Thin Films for MEMS Actuators

Advanced Engineering Materials, EarlyView.
A comprehensive study of critical parameters required to develop well‐performing Ti–Ni–Cu thin film shape memory alloy microactuators is provided. Materials science and device integration aspects are integrated by addressing structural and physical relationships using complementary characterization techniques as well as a practical fabrication solution
Elaheh Akbarnejad, Aleksander Kostka, Gowtham Arivanandhan, Yujiao Li, Alan Savan, Manfred Kohl, Alfred Ludwig   +6 more
wiley   +1 more source

Development of geometrically necessary dislocation density and micromechanical fields in solid state thermal cycle

Journal of Materials Research and Technology
This study presents a comprehensive analysis of time evolution and spatial distribution of crystallographic geometrically necessary dislocation (GND) density induced by solid-state thermal cycling in an IN718 polycrystal.
Anderson Nascimento, Irene J. Beyerlein
doaj   +1 more source

Creep‐Induced Microstructural Evolution in an A2‐B2 Superalloy

Advanced Engineering Materials, EarlyView.
A 27.3Ta‐27.3Mo‐27.3Ti‐8Cr‐10Al (at.%) refractory high‐entropy alloy with precipitation‐strengthened A2‐B2 microstructure was studied by creep tests at 1030°C, which demonstrate a transition in deformation mechanisms in the range of 100–150 MPa applied stress. This is associated with changes in dislocation–precipitate interactions. Relevant deformation
Liu Yang, Aparajita Pramanik, Sandipan Sen, Shubhashis Dixit, Marcel Muench, R. J. Vikram, Daniel Schliephake, Yolita M. Eggeler, Ankur Chauhan, Martin Heilmaier, Alexander Kauffmann   +10 more
wiley   +1 more source

Strain-Gradient Crystal Plasticity Finite Element Modeling of Slip Band Formation in α-Zirconium

Crystals, 2021
Two methods for the determination of geometrically necessary dislocation (GND) densities are implemented in a lower-order strain-gradient crystal plasticity finite element model. The equations are implemented in user material (UMAT) subroutines. Method I
Omid Sedaghat, Hamidreza Abdolvand
doaj   +1 more source

Ontology‐Aligned Structuring and Reuse of Multimodal Materials Data and Workflows Toward Automatic Reproduction

Advanced Engineering Materials, EarlyView.
Reproduction of stacking fault energy calculations from literature with a semi‐automated large language model‐assisted extraction procedure: extraction of simulation protocol, atomistic structures, computational parameters, and reported results, ontology alignment, knowledge graph construction and, finally, recomputation forvalidation.
Sepideh Baghaee Ravari, Abril Azocar Guzman, Sarath Menon, Stefan Sandfeld, Tilmann Hickel, Markus Stricker   +5 more
wiley   +1 more source

Effect of pre-existing immobile dislocations on the evolution of geometrically necessary dislocations during fatigue

Modelling and Simulation in Materials Science and Engineering, 2017
The role of pre-existing mobile and immobile dislocation densities on the evolution of geometrical necessary dislocation densities (GNDs) during cyclic fatigue in shear is studied using a continuum dislocation-based model incorporated in a crystal plasticity finite element scheme.
Irastorza-Landa, A., Grilli, N., Van Swygenhoven, H.   +2 more
openaire   +2 more sources