Research Highlights

Characterizing Performance of Nanostructured Alloys for Extreme Environments

In situ neutron diffraction characterization of strains in nanostructured materials reveals, for the first time, a large temperature-sensitive elastic anisotropy and a deformation crossover upon extensive straining. The novel approach utilized to determine single-crystal...

Mapping solute excesses and curvature of grain boundaries

A novel characterization method has been developed that enables complete characteriza­tions of grain boundaries by atom probe tomography (APT) in terms of the orientation relationship of the adjacent grains, local variations of the habit plane, surface curvature, and the solute...

Metallic Glasses: Different Deformation Properties Underpinned by the Same Trigger

A novel simulation approach demonstrates that a universal deformation trigger exists in metallic glasses and that the spatial organization of these triggers is closely related to the dynamics and stabilities of the system. This work demonstrates that a universal trigger initiates...

Electronic Excitations Transform Structure of Ceramics

Ab initio molecular dynamics calculations reveal that electronic excitations induce a structural instability that transforms Y2Ti2O7, Gd2Ti2O7 and Sm2Ti2O7 with the pyrochlore...

Rig designed to study effect of vibration on spent nuclear fuel

Researchers have developed an innovative system, called Cyclic Integrated Reversible-bending Fatigue Tester (CIRFT), to test and evaluate the mechanical behavior of spent nuclear fuel (SNF) under normal transportation conditions. The SNF fatigue data generated by CIRFT technology are...

ORNL's Plasma-arc lamp tests instrument for NASA solar probe

To test a key instrument of a spacecraft that will fly closer to the sun than any before, engineers at Oak Ridge National Laboratory and the University of California–Berkeley used ORNL’s powerful plasma-arc lamp as a solar heat flux simulator. They tested the Fields instrument, which...

Compositional Complexity Effectively Modifies Defect Migration Barriers

Compared to pure nickel, tuning chemical composition in binary alloys has altered migration barriers of defects, and significantly affected  Cross-sectional transmission electron microscopy images of Ni, NiCo and NiFe showing irradiation-induced damage is much deeper in Ni...