Synthesis of Amorphous/Crystalline Laminated Metals via Accumulative Roll Bonding
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Bulk metallic glasses (BMG) are best known for their high strength and hardness; however, due to their limited tensile plasticity, they are undesirable for many structural applications. Nano-laminated amorphous/crystalline metals fabricated via deposition techniques have been shown to deform homogeneously while demonstrating extraordinary mechanical properties, including high strength and ductility; however, their fabrication is limited in size and scalability potential. Here, accumulative roll bonding has been demonstrated as a scalable fabrication technique for the processing of nanolaminated Zr-based BMG/Ni composites. The rolling was performed at elevated temperatures, utilizing the thermoplastic formability of the BMG in its supercooled liquid region. Microhardness measurements were utilized to investigate the thermo-mechanical history of the BMG phase. Refined BMG layers with thicknesses as small as 34 nm have been characterized using transmission electron microscopy techniques. The resulting amorphous/crystalline interface has been demonstrated to have an effective interface width of 3–4 nm.
Prof. Irene Beyerlein of UC Santa Barbara is acknowledged for useful conversations on roll-bonding of the investigated materials. This work was supported in part by the University of California, Riverside and NSF CMMI Grant 1550986. Douglas Hofmann acknowledges support from the Presidential Early Career Award. Part of this research was done at the Jet Propulsion Laboratory, California Institute of Technology, under contract with NASA. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not constitute or imply its endorsements by the United States Government or the Jet Propulsion Laboratory, California Institute of Technology. Electron microscopy and FIB was performed on FEI NNS450 SEM, FEI Titan Themis 300 STEM and FEI Quanta 3D 200i FIB/SEM in CFAMM at UC Riverside.
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