Methods are provided for processing a powdery material with an electron beam system for additive manufacturing of components, which solve the problem of electrostatic powder expulsion and significantly reduce process times. This effect is achieved by using acceleration voltages of 90 kV or greater in the preheating step and/or in the melting step.

A superalloy powder mixture is provided for use with additive manufacturing or welding metal components or portions thereof that includes a high melt superalloy powder and a low melt superalloy powder. The superalloy powder mixture comprises by weight about 4% to about 23% chromium, about 4% to about 20% cobalt, 0% to about 8% titanium, about 1.5% to about 8% aluminum, 0% to about 11% tungsten, 0% to about 4% molybdenum, about 1% to about 13% tantalum, 0% to about 0.2% carbon, 0% to about 1% zirconium, 0% to about 4% hafnium, 0% to about 4% rhenium, 0% to about 0.1% yttrium and/or cerium, 0% to about 0.04% boron, 0% to about 2% niobium, greater than 40% nickel, greater than 4% in total of aluminum and optional titanium content. The high melt superalloy powder includes less than half the content by weight percent of tantalum compared to the content by weight percent of tantalum in the low melt superalloy powder.

A sterling silver chain and method of manufacturing a sterling silver chain comprising a plurality of chain links. Each of the chain links can comprise a sterling silver wire, the sterling silver wire comprising a first end and a second end. Each of the first end and the second end of each of the plurality of chain links can be joined together through a weld. Each of the plurality of chain links can comprise at least 92.5% by weight silver and at least 6.5% by weight tin.

The present disclosure provides a high-sensitivity terahertz sensor. The high-sensitivity terahertz sensor includes a substrate; a metal microstructure array, including a plurality of metal microstructure units, and covering the substrate to form a metasurface; and metal nanostructures, located at gaps of the metal microstructure array, where the metal microstructure array and the metal nanostructures are formed by etching a metal film on the substrate through pulsed laser direct writing. The present disclosure utilizes the metasurface and the metal nanostructures to cooperatively enhance the terahertz wave, promoting full interaction between the terahertz wave and the analyte and improving terahertz detection sensitivity.

Methodologies and manufacturing processes to manufacture components by electron beam melting additive manufacturing, particularly components of molybdenum or a molybdenum-based alloy and particularly of complex nuclear component geometries. Input parameters are provided for controlling electron beam melting additive manufacturing equipment, such as electron beam melting machines. The input parameters relate to various process steps, including build set-up, initial thermal treatment, initial layering of powder, pre-consolidation thermal treatment, consolidation, post-consolidation thermal treatment, indexing of layers, and post-build thermal treatment. The methodologies and manufacturing processes allow manufacture of components of molybdenum having a purity of 99.0% and a density of 99.75%. Metallographic cross-sections of the manufactured molybdenum components were porosity-free and crack-free.