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Xe Plasma FIB


Figure 3 : Zirconium-based bulk metallic glass. (a) SEM image of a single PFIB-prepared slice of the Zr-based BMG showing the dendrites. Two interlocked red and yellow grains are highlighted in outline. (b) 3D rendering showing the interlocking of two dendrites of which (a) shows only a section through.


Figure 2 : Stress corrosion cracking in a 7000 series aluminum alloy. (a) SEM image of the PFIB-prepared block for serial sectioning showing a part of the stress corrosion crack in the aluminum alloy. (b) Magnifi ed region of a slice showing the detailed microstructure of the aluminum grain structure captured with an 18 nm pixel size. (c) 3D rendering showing precipitates, predominantly along grain boundaries taken from a sub region of (b) and presented at a non-orthogonal angle. Arrows indicate the registration of (b) and (c).


Materials and Methods Operating conditions . All experiments were conducted using an FEI Helios PFIB operated at 30 kV. For the serial sectioning studies, a current of 59 nA was used within the automated procedure whilst higher currents were employed for the initial shaping of the block for serial sectioning. T e FEI Auto Slice and View TM (ASNV) soſt ware was used to manage the slicing and imaging process with integrated rocking milling. T is method has been developed to


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minimize curtaining that may arise during unidirectional FIB milling. It uses a stage move to create each alternate slice with the incident ion beam coming from +/- 5° with respect to vertical top-down 0° milling. Details of the setup can be found in [ 13 ]. T e Nanoscale X-ray CT measurements were made using a Zeiss Xradia Ultra 810 operating at 5.5 kV. All 3D data were aligned, post-processed, and visualized using FEI Avizo 9.0.0 soſt ware. Stress corrosion crack . A stress corrosion crack in a 7000 series aluminum alloy is presented to show the ability to target site-specifi c locations using the PFIB-SEM. It is only possible to look at a part of this large crack, but it is of suffi cient volume to appreciate the morphology at the 100 μ m scale and relate it to the complete crack. A 50 nm slice thickness and a pixel size of 16 nm was used in the ASNV soſt ware, which was suffi cient to observe many of the precipitates in the material and the particles decorating the grain boundaries. T is made it possible to look for evidence of an interaction of the crack with these particles as it propagated along the grain boundaries. Zirconium-based bulk metallic glass . T e bulk metallic glass (BMG) sample was analyzed with a 100 nm slice thickness and a pixel size of 24 nm. T is is a novel new material with a composition Zr 58.5 Ti 14.3 Nb 5.2 Cu 6.1 Ni 4.9 Be 11.0 consisting of a bulk metallic glass matrix within which crystalline dendrites have grown. T is material is being investigated as a high-strength, high-ductility


www.microscopy-today.com • 2016 May


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