Abstract Metal additive manufacturing technologies, such as powder bed fusion process, directed energy deposition (DED) sheet lamination etc., are one of promising flexible technologies due to direct fabrication characteristics a metallic freeform with three-dimensional shape from computer aided design data. DED processes can create an arbitrary on even and uneven substrates through line-by-lin...

A hybrid modeling approach combining two-dimensional atomistic molecular dynamics simulations of vacancy formation with a continuum analysis of vacancy diffusion has been used to predict the vacancy content of vapor deposited nickel as a function of deposition rate/temperature and incident flux energy/angle. The hybrid approach uses a previously developed molecular dynamics technique to obtain ...

Abstract Directed energy deposition (DED) was used to produce niobium carbide (NbC)‐reinforced Ti6Al4V (Ti64) metal–matrix‐composite (MMC) structures. The objective improve upon Ti64's wear and oxidation resistance. characterization techniques consisted of scanning electron microscopy (SEM), backscattered (BSE) imaging, energy‐dispersive X‐ray spectroscopy (EDS), diffraction analysis (XRD), the...

Additive manufacturing is typically a flexible alternative to conventional processes. However, costs increase due the effort required experimentally determine optimum process parameters for customized products or small batches. Therefore, simulation models are needed in order reduce amount of necessary experimental testing. For this purpose, novel technological method directed energy deposition...

Damascene approaches are widely used for creating microelectronic interconnects. Successful implementation of the process is reliant upon the deposition of a refractory metal or metal nitride liner coating. It functions as a diffusion barrier layer to suppress transport of subsequently deposited interconnect metals into the surrounding dielectric. The development of vapor-phase processes for th...

The prevalence of colloid deposition at grain-to-grain contacts in two porous media (spherical glass beads and angular quartz sand, 710-850 microm) was examined using X-ray microtomography (XMT) under conditions where the colloid-grain surface interaction was solely attractive (lacking an energy barrier to deposition), and under fluid velocity conditions representative of engineered filtration ...

During the next century, atmospheric nitrogen (N) deposition is projected to more than double, potentially slowing litter decomposition by altering microbial community composition and function. If the flow of energy though detrital food webs is diminished by the slowing of decay under higher rates of atmospheric N deposition, this agent of global change could also negatively impact the abundanc...