@article{hankwitz_ledford_rock_o'dell_horn_2021, title={Electron Beam Melting of Niobium Alloys from Blended Powders}, volume={14}, ISSN={["1996-1944"]}, DOI={10.3390/ma14195536}, abstractNote={Niobium-based tungsten alloys are desirable for high-temperature structural applications yet are restricted in practice by limited room-temperature ductility and fabricability. Powder bed fusion additive manufacturing is one technology that could be leveraged to process alloys with limited ductility, without the need for pre-alloying. A custom electron beam powder bed fusion machine was used to demonstrate the processability of blended Nb-1Zr, Nb-10W-1Zr-0.1C, and Nb-20W-1Zr-0.1C powders, with resulting solid optical densities of 99+%. Ultimately, post-processing heat treatments were required to increase tungsten diffusion in niobium, as well as to attain satisfactory mechanical properties.}, number={19}, journal={MATERIALS}, author={Hankwitz, Jameson P. and Ledford, Christopher and Rock, Christopher and O'Dell, Scott and Horn, Timothy J.}, year={2021}, month={Oct} }
 @article{ellis_sprayberry_ledford_hankwitz_kirka_rock_horn_katoh_dehoff_2021, title={Processing of tungsten through electron beam melting *}, volume={555}, ISSN={["1873-4820"]}, DOI={10.1016/j.jnucmat.2021.153041}, abstractNote={Additive manufacturing (AM) presents a new design paradigm for the manufacture of engineering materials through the layer-by-layer approach combined with welding theory. In the instance of difficult to process materials such as tungsten and other refractory metals, AM offers an opportunity for radical redesign of critical components for next-generation energy technologies including fusion. In this work, electron beam powder bed fusion (EB-PBF) is applied to process pure tungsten to study the influence of process parameters on the defect density of the material. An in-situ image analysis algorithm is applied to pure tungsten for the first time, and is used to visualize the defect structure in AM tungsten. Finally, a cracking mechanism for AM tungsten is proposed, and suggestions for suppression of cracks in pure tungsten are offered.}, journal={JOURNAL OF NUCLEAR MATERIALS}, author={Ellis, Elizabeth A. I. and Sprayberry, Michael A. and Ledford, Christopher and Hankwitz, Jameson P. and Kirka, Michael M. and Rock, Chris D. and Horn, Timothy J. and Katoh, Yutai and Dehoff, Ryan R.}, year={2021}, month={Nov} }
 @article{roh_okello_golbasi_hankwitz_liu_tracy_velev_2019, title={3D-Printed Silicone Soft Architectures with Programmed Magneto-Capillary Reconfiguration}, volume={4}, ISSN={["2365-709X"]}, DOI={10.1002/admt.201800528}, abstractNote={Abstract}, number={4}, journal={ADVANCED MATERIALS TECHNOLOGIES}, publisher={Wiley}, author={Roh, Sangchul and Okello, Lilian B. and Golbasi, Nuran and Hankwitz, Jameson P. and Liu, Jessica A-C and Tracy, Joseph B. and Velev, Orlin D.}, year={2019}, month={Apr} }