@article{mahbooba_thorsson_unosson_skoglund_west_horn_rock_vogli_harrysson_2018, title={Additive manufacturing of an iron-based bulk metallic glass larger than the critical casting thickness}, volume={11}, ISSN={["2352-9407"]}, DOI={10.1016/j.apmt.2018.02.011}, abstractNote={Fe-based bulk metallic glasses (BMG) are of increasing research interest, driven in part by a unique combination of mechanical, magnetic and chemical properties. However, the maximum thickness and geometry of BMGs achievable in traditional manufacturing processes is limited. This work examines the capabilities of laser based powder bed additive manufacturing (AM) to produce relatively large Fe-based bulk metallic glass specimens. AM fabricated specimens exceed the critical casting thickness of the material by a factor of 15 or more in all dimensions. Resulting microstructural and mechanical properties are reported. Despite decreasing quench effect with increasing build thickness, X-ray diffraction analysis suggests that a fully amorphous structure was maintained throughout the build. However, a low concentration of sparsely distributed nano-grain clusters was discovered using a high-resolution electron backscatter diffraction scan. The results pave the way for novel applications of metallic glasses achievable through appropriate material design and optimization of existing additive manufacturing processes.}, journal={APPLIED MATERIALS TODAY}, author={Mahbooba, Zaynab and Thorsson, Lena and Unosson, Mattias and Skoglund, Peter and West, Harvey and Horn, Timothy and Rock, Christopher and Vogli, Evelina and Harrysson, Ola}, year={2018}, month={Jun}, pages={264–269} }
 @article{mahbooba_west_harrysson_wojcieszynski_dehoff_nandwana_horn_2017, title={Effect of Hypoeutectic Boron Additions on the Grain Size and Mechanical Properties of Ti-6Al-4V Manufactured with Powder Bed Electron Beam Additive Manufacturing}, volume={69}, ISSN={["1543-1851"]}, DOI={10.1007/s11837-016-2210-9}, abstractNote={In additive manufacturing, microstructural control is feasible via processing parameter alteration. However, the window for parameter variation for certain materials, such as Ti-6Al-4V, is limited, and alternative methods must be employed to customize microstructures. Grain refinement and homogenization in cast titanium alloys has been demonstrated through the addition of hypoeutectic concentrations of boron. This work explores the influence of 0.00 wt.%, 0.25 wt.%, 0.50 wt.%, and 1.0 wt.% boron additions on the microstructure and bulk mechanical properties of Ti-6Al-4V samples fabricated in an Arcam A2 electron beam melting (EBM) system with commercial processing parameters for Ti-6Al-4V. Analyses of EBM fabricated Ti-6Al-4V + B indicate that the addition of 0.25–1.0 wt.% boron progressively refines the grain structure, and it improves hardness and elastic modulus. Despite a reduction in size, the β grain structure remained columnar as a result of directional heat transfer during EBM fabrication.}, number={3}, journal={JOM}, author={Mahbooba, Zaynab and West, Harvey and Harrysson, Ola and Wojcieszynski, Andrzej and Dehoff, Ryan and Nandwana, Peeyush and Horn, Timothy}, year={2017}, month={Mar}, pages={472–478} }
 @article{manogharan_yelamanchi_aman_mahbooba_2016, title={Experimental Study of Disruption of Columnar Grains During Rapid Solidification in Additive Manufacturing}, volume={68}, ISSN={["1543-1851"]}, DOI={10.1007/s11837-015-1800-2}, number={3}, journal={JOM}, author={Manogharan, Guha and Yelamanchi, Bharat and Aman, Ronald and Mahbooba, Zaynab}, year={2016}, month={Mar}, pages={842–849} }
 @article{nunn_mahbooba_ivanov_ivanov_brenner_shenderova_2015, title={Tribological properties of polyalphaolefin oil modified with nanocarbon additives}, volume={54}, ISSN={["1879-0062"]}, DOI={10.1016/j.diamond.2014.09.003}, abstractNote={Enhancing the tribological properties and performance of lubricants with nanoparticle additives is an active area of research. Results of block-on-ring experiments examining tribological properties of polyalphaolefin (PAO) oil containing small amount of nanocarbon additives are reported in this study. Comparative analysis of coefficient of friction (COF) and wear was performed for PAO oil containing nanodiamond particles, onion-like carbon (OLC), single/multiwall carbon nanotubes (SWNT/MWNT) or nanographene platelets (NGPs). The performance of PAO oil samples containing nanodiamond additives was considerably different from those containing sp2 nanocarbon additives. The presence of sp2 nanocarbons reduced the COF of PAO by ~ 8–12 times. This effect on the COF was accompanied by a reduction in wear with the addition of carbon nanotubes and NGP; however, the wear was slightly increased in the presence of OLC. The presence of nanodiamond reduced the COF by ~ 70×, and the wear was significantly increased. The performance of nanocarbon particles in PAO in combination with molybdenum dialkyldithiophosphate (MoDDP) was also investigated. The combination of polishing capability of nanodiamonds with the protective action of MoDDP resulted in the reduction of both wear and COF as compared to pure PAO. In contrast, the combination of sp2 nanocarbons with MoDDP caused degradation of the PAO lubrication performance.}, journal={DIAMOND AND RELATED MATERIALS}, author={Nunn, N. and Mahbooba, Z. and Ivanov, M. G. and Ivanov, D. M. and Brenner, D. W. and Shenderova, O.}, year={2015}, month={Apr}, pages={97–102} }