Search

Soft X-ray Images of the Solar Corona with a Normal-Incidence Cassegrain Multilayer Telescope THE STUDY OF THE SOLAR ATMOSPHERE IS COMPLICATED IN that the sizes of the fundamental structures that [...]

It is known that the room-temperature plastic deformation of bulk metallic glasses is compromised by strain softening and shear localization, resulting in near-zero tensile ductility. The incorporation of metallic glasses into engineering materials, therefore, is often accompanied by complete brittleness or an apparent loss of useful tensile ductility. Here we report the observation of an exceptional tensile ductility in crystalline copper/copper-zirconium glass nanolaminates. These nanocrystalline-amorphous nanolaminates exhibit a high flow stress of 1.09 ± 0.02 GPa, a nearly elastic-perfectly plastic behavior without necking, and a tensile elongation to failure of 13.8 ± 1.7%, which is six to eight times higher than that typically observed in conventional crystalline- crystalline nanolaminates (<2%) and most other nanocrystalline materials. Transmission electron microscopy and atomistic simulations demonstrate that shear banding instability no longer afflicts the 5- to 10-nm-thick nanolaminate glassy layers during tensile deformation, which also act as high-capacity sinks for dislocations, enabling absorption of free volume and free energy transported by the dislocations; the amorphous-crystal interfaces exhibit unique inelastic shear (slip) transfer characteristics, fundamentally different from those of grain boundaries. Nanoscale metallic glass layers therefore may offer great benefits in engineering the plasticity of crystalline materials and opening new avenues for improving their strength and ductility. [ABSTRACT FROM AUTHOR]

The study of the transport of electrons, and the flow of energy into a solid target or dense plasma, is instrumental in the development of fast-ignition inertial confinement fusion. An extreme ultraviolet (XUV) imaging diagnostic at 256 and 68 eV provides information about heating and energy deposition within petawatt-laser-irradiated targets. The XUV images of several irradiated solid targets are presented. [ABSTRACT FROM AUTHOR]