A5071751534- Advanced Materials Characterization Techniques
- Microstructure and mechanical properties
- Metal and Thin Film Mechanics
- Ion-surface interactions and analysis
- Microstructure and Mechanical Properties of Steels
- High-Temperature Coating Behaviors
- Hydrogen embrittlement and corrosion behaviors in metals
- Analytical chemistry methods development
- High Temperature Alloys and Creep
- Electron and X-Ray Spectroscopy Techniques
- Metal Alloys Wear and Properties
- High Entropy Alloys Studies
- Aluminum Alloy Microstructure Properties
- Advanced Electron Microscopy Techniques and Applications
- Aluminum Alloys Composites Properties
- Magnesium Alloys: Properties and Applications
- Advanced materials and composites
- Electronic and Structural Properties of Oxides
- Diamond and Carbon-based Materials Research
- Metallurgical Processes and Thermodynamics
- Advancements in Battery Materials
- Extraction and Separation Processes
- Copper Interconnects and Reliability
- Image and Signal Denoising Methods
- Composite Material Mechanics
Max-Planck-Institut für Nachhaltige Materialien
2019-2025
University of Alabama
2016-2024
Max Planck Society
2020-2021
Nanjing Tech University
2019
Guangxi Normal University
2014-2015
Dalian University of Technology
2012-2014
Hainan University
2014
Hunan Institute of Science and Technology
2014
Jinggangshan University
2009-2010
East China Jiaotong University
2010
The lack of strength and damage tolerance can limit the applications conventional soft magnetic materials (SMMs), particularly in mechanically loaded functional devices. Therefore, strengthening toughening SMMs is critically important. However, concepts usually significantly deteriorate properties, due to Bloch wall interactions with defects used for hardening. Here a novel concept overcome this dilemma proposed, by developing bulk excellent mechanical attractive properties through coherent...
Abstract Multiprincipal‐element alloys (MPEAs), including high‐entropy alloys, are a new class of materials whose thermodynamical properties mainly driven by configuration entropy, rather than enthalpy in the traditional especially at high temperatures. Herein, design novel soft‐magnetic nonequiatomic, quaternary MPEA is described, via tuning its chemical composition to deliberately manipulate microstructure, such that it contains ultrafine ferromagnetic body‐centered‐cubic (BCC) coherent...
A cross-correlative precession electron diffraction - atom probe tomography investigation of Cr segregation in a Fe(Cr) nanocrystalline alloy was undertaken. Solute found to be dependent on grain boundary type. The results which were compared hybrid Molecular Dynamics and Monte Carlo simulation that predicted the for special character, low angle, high angle boundaries, as well inclination boundary. It highest concentration boundaries is explained terms clustering driven by onset phase...
Abstract Since its first emergence in 2004, the high‐entropy alloy (HEA) concept has aimed at stabilizing single‐ or dual‐phase multi‐element solid solutions through high mixing entropy. Here, this strategy is changed and renders such massive metastable, to trigger spinodal decomposition for improving alloys’ magnetic properties. The motivation starting from a HEA approach provide chemical degrees of freedom required tailor behavior using multiple components. key idea form Fe‐Co enriched...
The selectivity of hydrogenation furfural can be tuned to furfuryl alcohol, cyclopentanone, and cyclopentanol by tuning the reaction conditions with a Cu catalyst. Catalyzed Cu0.4Mg5.6Al2, hydrogenated dehydrated smoothly in high yields, respectively. At 110 °C under 2.0 MPa H2 pressure, alcohol obtained 99.5% yield. Moreover, Cu0.4Mg5.6Al2 catalyzed water gave 98.6% Additionally, cyclopentanone also 98.1% catalyst reused several times only slightly deactivation. well excellent yield...
Hydrogen embrittlement (HE) affects all major high-strength structural materials and as such is a impediment to lightweighting e.g. vehicles help reduce carbon-emissions reach net-zero. The 7xxx series aluminium alloys can fulfil the need for light, high strength materials, are already extensively used in aerospace weight reduction purposes. However, depending on thermomechanical loading state, these be sensitive stress-corrosion cracking (SCC) through anodic dissolution hydrogen...
The worldwide development of electric vehicles as well large-scale or grid-scale energy storage to compensate for the intermittent nature renewable generation has led a surge interest in battery technology. Understanding factors controlling capacity and, critically, their degradation mechanisms ensure long-term, sustainable and safe operation requires detailed knowledge microstructure chemistry, evolution under operating conditions, on nanoscale. Atom probe tomography (APT) provides...
Chemical short-range order (CSRO) refers to atoms of specific elements self-organising within a disordered crystalline matrix form particular atomic neighbourhoods. CSRO is typically characterized indirectly, using volume-averaged or through projection microscopy techniques that fail capture the three-dimensional atomistic architectures. Here, we present machine-learning enhanced approach break inherent resolution limits atom probe tomography enabling imaging multiple CSROs. We showcase our...
The early stages of corrosion occurring at liquid-solid interfaces control the evolution material's degradation process, yet due to their transient state, analysis remains a formidable challenge. Here tests are performed on MgCa alloy, candidate material for biodegradable implants using pure water as model system. reaction is suspended by plunge freezing into liquid nitrogen. early-stage process nanoscale correlating cryo-atom probe tomography (APT) with transmission-electron microscopy...
Abstract Synthesizing distinct phases and controlling crystalline defects are key concepts in materials design. These approaches often decoupled, with the former grounded equilibrium thermodynamics latter nonequilibrium kinetics. By unifying them through defect phase diagrams, we can apply models to thermodynamically evaluate defects—including dislocations, grain boundaries, boundaries—establishing a theoretical framework linking material imperfections properties. Using scanning transmission...
Bi2 Te3 -based alloys have great market demand in miniaturized thermoelectric (TE) devices for solid-state refrigeration and power generation. However, their poor mechanical properties increase the fabrication cost decrease service durability. Here, this work reports on strengthened robustness due to thermodynamic Gibbs adsorption kinetic Zener pinning at grain boundaries enabled by MgB2 decomposition. These effects result much-refined size twofold enhancement of compressive strength Vickers...
Grain boundaries, the two-dimensional defects between differently oriented crystals, tend to preferentially attract solutes for segregation. Solute segregation has a significant effect on mechanical and transport properties of materials. At atomic level, however, interplay structure composition grain boundaries remains elusive, especially with respect light interstitial like B C. Here, we use Fe alloyed C exploit strong interdependence interface chemistry via charge-density imaging atom...
Combined atomic-scale characterization and simulation reveal the complexity diversity of chemical nature dislocations.
The local variation of grain boundary atomic structure and chemistry caused by segregation impurities influences the macroscopic properties poylcrystalline materials. Here, effect co-segregation carbon boron on depletion aluminum at a $\Sigma 5\,(3\,1\,0\,) [0\,0\,1]$ tilt in $\alpha-$Fe-$4~at.~\%$Al bicrystal was studied combining resolution scanning transmission electron microscopy, atom probe tomography density functional theory calculations. structural units mostly resemble kite-type...
Abstract The embrittlement of metallic alloys by liquid metals leads to catastrophic material failure and severely impacts their structural integrity. weakening grain boundaries (GBs) the ingress metal preceding segregation in solid are thought promote early fracture. However, potential balancing between cohesion‐enhancing interstitial solutes embrittling elements inducing GB de‐cohesion is not understood. Here, mechanisms how boron mitigates detrimental effects prime embrittler, zinc, a Σ5...
Brittle topologically close-packed precipitates form in many advanced alloys. Due to their complex structures, little is known about plasticity. Here, a strategy presented understand and tailor the deformability of these phases by considering Nb-Co µ-phase as an archetypal material. The plasticity controlled Laves phase building block that forms parts its unit cell. It found between bulk C15-NbCo2 µ-phases, interplanar spacing local stiffness change, leading strong reduction hardness...
Experimental results reveal that the apparent activation-energy for grain-growth in an fcc-based AlxCoCrFeNi high entropy alloy (HEA) system increases from 179 to 486 kJ/mol when Al content x = 0.1 0.3. These unexpectedly values can be potentially attributed solute clustering within fcc solid-solution phase develops with increasing this HEA. Detailed microstructural analysis using atom-probe tomography and density functional theory (DFT) calculations strongly indicate presence of such...