Abstract
In-situ composites of thermodynamically compatible phases have been the subject of recent investigations and in particular, those comprising 2-phase Nb/Nb5Si3 structures. Chemical reactions initiated by high velocity shock waves can be extremely rapid and (unlike more conventional techniques) are capable of forming composite compounds with carefully controlled, fine-scale microstructures. The current investigation involves the use of SEM, TEM and EDX to fully characterize the microstructure of niobium silicide specimens (of initial bulk compositions Si 40 at.% Nb and Nb 33 at.% Si) formed by shock-synthesis of nominally 5 μm size particles in a powder gas gun at an impact velocity of 1.3 km/s.Recovered specimens were in the form of 34 mm diameter × 7 mm thick disks. Metallographic sectioning and examination by SEM in the backscattered imaging mode showed that both disks had undergone a chemical reaction with the exception of the peripheral regions which were merely compacted. Examination was also performed using a Philips CM30 analytical TEM at 300 keV in addition to EDX with a Link Systems ultrathin window detector.
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Schedule a callMore From: Proceedings, annual meeting, Electron Microscopy Society of America
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