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CoCrFeNi alloy is an exemplary stable base for high entropy alloys (HEAs), but its phase stability is still suspicious. Here, the CoCrFeNi HEA was firstly identified to be thermally metastable at 750°C. Composition decomposition occurred after annealed at 750°C for 800h. The minor addition of Al accelerated the composition decomposition and a second fcc phase with a different lattice constant occurred...
Unlike crystalline metals, which have a well-understood periodical structure, the amorphous structure of metallic glasses (MGs) is still poorly understood, particularly when such a structure rearranges itself at the nanoscale under external agitations. In this article, we provide compelling evidence obtained from a recently developed high-resolution atomic force microscopy (HRAFM) technique that reveals...
A new higher chromium variant of mechanically alloyed (MA) oxide dispersion strengthened (ODS) ferritic alloy, designated 14YWT, has been developed. The microstructures of this alloy have been characterized in the local electrode atom probe from the initial ball milled flakes through the extruded material that was heat treated at up to 1380degC. No nanoclusters were found in the ball milled flakes...
Surface-channel PMOSFET's have been realized using a dopant-drive-out technique with WSi/sub x/ polycide gate. The advantages of this technique include (1) excellent thermal stability, (2) superior electrical device characteristics suitable for deep sub-half micron technology, (3) 10 Omega / Square Operator sheet resistance for a thin gate stack (<or=200 nm), (4) less severe gate topography, and...
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