Explanipedia

Inhomogeneities in directed energy deposition of refractory metals with widely different melting temperatures and mass densities Open

A. J. Stair, Alexander J. Myers, Jonathan A. Malen, Bryan A. Webler, Jack Beuth , et al. · 2025

A reversible solvent segregation transition at grain boundaries in gold-platinum alloys Open

Sebastián Calderón, Wenyu Chen, Md. Shariful Islam, Sai S. Tripathy, Maarten P. Boer , et al. · 2025

Anisotropic reactive ion etching of 2.5 micrometer thick alpha phase tantalum films for surface micromachining Open

Md Shariful Islam, Longchang Ni, Maarten P. Boer · 2025

An etch parameter study is conducted with the objective of achieving high anisotropy for tantalum (Ta) thin films of more than 1 μm in thickness. The gases explored are Argon (Ar), carbon tetrafluoride (CF4) and oxygen. The effects of comp…

Constraint Active Search in Process Window Optimization for Powder Feed Directed Energy Deposition Open

Xiaoxiao Wang, Jose A. Loli, Zachary W. Ulissi, Maarten P. Boer, Bryan A. Webler , et al. · 2025

Optimizing process parameters for directed energy deposition is crucial to achieve high-quality printed parts. However, this optimization process often entails significant time and cost investments. An initial investigation into the proces…

Optimization Study of Rare Earth-Free Metal Amorphous Nanocomposite Axial Flux-Switching Permanent Magnet Motor Open

Kyle Schneider, S. Simizu, Michael E. McHenry, Maarten P. Boer · 2025

Metal amorphous nanocomposite (MANC) soft magnetic materials exhibit remarkably low iron loss and high saturation magnetization. However, they have not been widely used in electric motors largely due to a lack of demonstrated manufacturing…

A Reversible Solvent Segregation Transition at Grain Boundaries in Gold-Platinum Alloys Open

Sebastián Calderón, Wenyu Chen, Md Shariful Islam, S. Tripathy, Maarten P. Boer , et al. · 2025

Anisotropic Reactive Ion Etching of 2.5 Μm Thick Α-Ta Films for Surface Micromachining Open

Md Shariful Islam, Longchang Ni, Maarten P. Boer · 2025

Anisotropic Reactive Ion Etching of 2.5 Micrometer Thick Alpha Phase Tantalum Films for Surface Micromachining Open

Md Shariful Islam, Longchang Ni, Maarten P. Boer · 2025

Oxygen diffusion in freestanding body centered cubic tantalum structural thin films in air and in high vacuum Open

Ryan M. Pocratsky, Md. Shariful Islam, Longchang Ni, E Fox, Maarten P. Boer · 2024

Demonstration and Analysis of Conditions to Obtain a High Strength Inconel 625 to Stainless Steel 304L Interface by Directed Energy Deposition Open

A. J. Stair, Bryan A. Webler, Jack Beuth, Maarten P. Boer · 2024

Functional grading (FG) is often used to bond dissimilar metals. However, that approach is complicated from a manufacturing perspective, and the associated challenges can outweigh the benefits of FG. Here, we investigate a directly bonded …

Low voltage cold and hot switching in nanoswitches cleaned by <i>in situ</i> oxygen plasma can achieve low stable contact resistance Open

Deepak Kumar, Casey M. Walker, Maarten P. Boer · 2024

Reliable nanoswitch operation requires low contact voltages and stable electrical contact resistance (ECR). Surface cleanliness is crucial to prevent nanomechanical switch failure, which can occur due to the presence of insulating adventit…

Investigation of metal amorphous nanocomposite soft magnetic alloys in the (FexNiyCo100−x-y)80B14Nb4Si2 system Open

Kyle Schneider, Y. Krimer, S. Simizu, Maarten P. Boer, Michael E. McHenry · 2023

Following reports of attractive soft magnetic performance of an (Fe₇₀Ni₃₀)₈₀B₁₄Nb₄Si₂ alloy [1]–[3], improvement to this alloy is sought through substitution of small percen…

Strength distributions of laminated FeNi-based metal amorphous nanocomposite ribbons Open

Kyle Schneider, Michael E. McHenry, Maarten P. Boer · 2023

Metal Amorphous Nanocomposite (MANC) materials offer low losses at high magnetic switching frequency, enabling high power density motors with increased rotational speed. While MANCs have high strength, they are brittle. The use of motor co…

Die singulation method and package formed thereby Open

Robert C. Anderson, Randy J Shul, Peggy J Clews, Michael S. Baker, Maarten P. Boer · 2023

A method is disclosed for singulating die from a substrate having a sacrificial layer and one or more device layers, with a retainer being formed in the device layer(s) and anchored to the substrate. Deep Reactive Ion Etching (DRIE) etchin…

Electrostatic apparatus for measurement of microfracture strength Open

Maarten P. Boer, Fernando Bitsie, Brian D. Jensen · 2023

A new class of materials testing apparatus has been invented. Particularly suited to the measurement of fracture and fatigue properties in the extremely strong materials encountered in microelectromechanical systems, material strains well …

Long working distance incoherent interference microscope Open

Michael B. Sinclair, Maarten P. Boer · 2023

A full-field imaging, long working distance, incoherent interference microscope suitable for three-dimensional imaging and metrology of MEMS devices and test structures on a standard microelectronics probe station. A long working distance …

Experimental insights into adhesion and friction between nominally dry rough surfaces Open

Bart Weber, Julien Scheibert, Maarten P. Boer, Ali Dhinojwala · 2022

Adhesion and friction between solids in ambient air control applications such as precision positioning and traction of tires. For all practical surfaces, the interfaces between solids are rough. Contact occurs at nano- or micro-contact jun…

Investigation of Metal Amorphous Nanocomposite Soft Magnetic Alloys in the (Fexniyco100-X-Y)80b14nb4si2 System Open

Kyle Schneider, Y. Krimer, S. Simizu, Maarten P. Boer, Michael E. McHenry · 2022

Modeling and Measuring the Stress Distribution in Soft Magnetic Cores due to Epoxy Impregnation and Curing Open

Kyle Schneider, Michael E. McHenry, Maarten P. Boer · 2021

Understanding the effects of viscoelastic relaxation of stresses is critical in electric motor and inductor applications, where the magnetic material is fully or partially comprised of an amorphous phase and impregnated in an epoxy. Magnet…

Ribbon Wrinkling Origin and Its Effect on Tape-Wound Core Shape Open

Walter Robinson, Michael E. McHenry, Maarten P. Boer · 2021

Improved understanding of advanced manufacturing techniques is needed to fabricate next- generation soft magnetic tape-wound cores. These utilize metal amorphous nano-composites (MANCs) in the form of long thin ribbons. MANCs exhibit attra…

Demonstration of tantalum as a structural material for MEMS thermal actuators Open

Longchang Ni, Ryan M. Pocratsky, Maarten P. Boer · 2021

This work demonstrates the processing, modeling, and characterization of nanocrystalline refractory metal tantalum (Ta) as a new structural material for microelectromechanical system (MEMS) thermal actuators (TAs). Nanocrystalline Ta films…

Creep of a thermally stable nanocrystalline nickel tungsten alloy as measured by high temperature nanoindentation Open

Prince S. Singh, Zhiyuan Liang, George M. Pharr, Maarten P. Boer · 2020

The creep behavior of pure nanocrystalline (nc) fcc metals has not been studied above 200 °C because the nanoscale grains tend to grow at temperatures moderately above ambient. In this work, we study the creep of nanocrystalline Ni–W (nc N…

Origins of thin film delamination induced by electrodeposition and processing methods to overcome it Open

Longchang Ni, Ryan M. Pocratsky, Maarten P. Boer · 2020

Electrodeposition is widely used to deposit films in technological applications, but when the current efficiency is low, injected hydrogen can strongly affect the materials properties of an underlying film including its residual stress, ad…

Preparing and Mounting Polymer Nanofibers onto Microscale Test Platforms Open

Ramesh Shrestha, Sheng Shen, Maarten P. Boer · 2018

Because they can achieve a high degree of molecular chain alignment in comparison with their bulk counterparts, the mechanical and thermal properties of polymer nanofibers are of great interest. However, due to their nanometer-scale size, …

Crystalline polymer nanofibers with ultra-high strength and thermal conductivity Open

Ramesh Shrestha, Pengfei Li, Bikramjit Chatterjee, Teng Biao Zheng, Xufei Wu , et al. · 2018

Micro- and Nanoscale Mechanical Testing. Open

Maarten P. Boer · 2016

Testing of Pt- and Ru-coated thermally actuated microrelays in an ultra-high purity environment. Open

Maarten P. Boer · 2016

Van der Waals and Capillary Adhesion of Microelectromechanical Systems. Open

Maarten P. Boer, Leslie M. Phinney, Christopher Jay Bourdon, Frank W. DelRio‬, Martin L. Dunn · 2016

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