EMNL's research featured by Brookhaven National Laboratory.
Broohaven National Laboratory shared an article on EMNL's reserach "Designing New Metal Alloys Using Engineered Nanostructures" focusing on aspects of the work conducted at the Center for Functional Nanomaterials to design and stabilize nanostructures in advanced alloys. Further information can be found HERE.
Prof. Trelewicz presents a contributed talk at the 2017 Fall MRS Meeting in Boston,
Jason's presentation "Grain Boundary Segregation Strengthening in Nanocrystalline Alloys" discussed our simulation results on the deformation mechanisms responsible for strengthening in nanocrystalline alloys containing grain boundary segregation.
EMNL's research featured in MRS Bulletin.
The article "Alloys of Nanocrystalline Tungsten Developed for Extreme Environment Applications" highlights our work on designing nanocrystalline tungsten alloy films with enhanced thermal stability to meet the demanding performance requirements of fusion reactors. Further information can be found HERE.
Prof. Trelewicz receives DOE Early Career Award on “Enhancing the Performance of Plasma-facing
Materials Through Solute-stabilized Nanostructured Tungsten Alloys”
Plasma-facing materials in future fusion devices will be exposed to demanding operating conditions involving high heat fluxes, aggressive particle and neutron fluxes, and high stresses. Although tungsten has emerged as a promising candidate, there are a number of outstanding issues yet to be resolved, including high temperature stability, mechanical performance, and radiation tolerance. The aim of this research is to address these limitations in tandem by precisely tailoring the volume fraction, chemistry, and structural state of grain boundaries in tungsten. Further information can be found HERE .
Yangs's paper "Stress-assisted Grain Growth in Nanocrystalline Metals: Grain Boundary
Mediated Mechanisms and Stabilization Through Alloying" published in Acta Materialia
This paper describes our work exploring t he mechanisms of stress-assisted grain growth in nanocrystalline Ni and Ni-1 at.% P as a function of grain size and deformation temperature using molecular dynamics simulations of nanoindentation . Grain orientation and atomic displacement vector mapping demonstrated that coalescence transpires through grain rotation and grain boundary migration, which were manifested in the grain interior and grain boundary components of the average microrotation. By adding solute to the grain boundaries, the temperature-dependent deformation behavior observed in both the lattice and grain boundaries inverted, indicating that the individual processes of dislocation and grain boundary plasticity will exhibit different activity based on boundary chemistry and deformation temperature.
Wenbo's paper with Prof. Timothy Rupert's group at UCI "
Nanocrystalline Al-Mg with Extreme Strength due to Grain Boundary Doping" published
in Materials Science and Engineering A
In this paper, n anocrystalline Al-Mg alloys were used to isolate the effect of grain boundary doping on the strength of nanostructured metals. Mg is added during mechanical milling, followed by low homologous temperature heat treatments to induce segregation without grain growth. Nanocrystalline Al -7 at% annealed for 1 h at 200 °C was the strongest alloy fabricated, with a compressive yield strength of 865 MPa (specific strength of 329 kN m/kg), making this one of the strongest lightweight metals reported to date.
Prof. Trelewicz presents invited talk at Los Alamos National Laboratory in Albuquerque,
Jason’s talk on “Stability and Self-ion Irradiation Damage in Nanocrystalline Tungsten Alloys” discussed our in situ TEM experiments on tungsten and tungsten alloy thin films including stability against grain growth, participate formation, and ion irradiation damage.
Prof. Trelewicz presents invited talk at
Sandia National Laboratories in Albuquerque, NM.
Jason’s presentation “Exploring the Mechanisms Underpinning Instabilities in Nanocrystalline Metals using Coupled Atomistic Simulations and In Situ TEM Experiments” addressed various mechanisms responsible for thermal, mechanical, and irradiation instabilities in nanocrystalline metals.
Olivia and Bin present contributed talks at the 2017 Spring MRS Meeting in Phoenix,
Olivia's presentation "Microstructural Evolution and Ion Damage in Nanocrystalline Alloys" discussed her work on probing the mechanisms of grain growth, stability, and irradiation damage in nanocrystalline tungsten using electron microscopy techniques. Bin's presentation "Mechanics Driven Design of Crystalline-Amorphous Nanolaminate Composites" focused on building microstructurally-indexed deformation mechanism maps and Ashby plots for crystalline-amorphous nanolaminates from atomistic simulations.
Olivia's paper "Impurity Stabilization of Nanocrystalline Grains in Pulsed Laser Deposited
Tantalum" published in the Journal of Materials Research
This paper describes our work exploring thermal stability in pulsed laser deposited (PLD) nanocrystalline tantalum using in situ transmission electron microscopy (TEM) annealing over a temperature range of 800–1200 °C. The evolution of the nanostructure was characterized using grain size distributions collectively with electron diffraction analysis and electron energy loss spectroscopy (EELS). Grain growth dynamics were further explored through molecular dynamics (MD) simulations of columnar tantalum nanostructures.
Prof. Trelewicz presents two invited and one contributed talk at the 2017 TMS Annual
Meeting in San Diego, CA.
Jason’s invited talks highlighted EMNL’s work on stress-assisted grain growth in nanocrystalline metals and self-ion damage in solute stabilized nanocrystalline tungsten alloys. The contributed talk reviewed thermodynamically stable nanocrystalline alloys with an emphasis on the application of various modeling formalisms for predicting stable alloy configurations.