Atomic arrangement and mechanical properties of chemical vapor deposited amorphous boron

Conference Dates

September 29-October 4, 2019


Amorphous boron fiber has been widely used as a reinforcement filler in aerospace resin-matrix composites due to its high strength and high elastic modulus. However, its mechanical properties have not been measured accurately due to intrinsic issues during fabrication. Amorphous boron is most commonly produced in singlefilament reactors by chemical vapor deposition of boron on tungsten wire, and the final product is a core-shell wire with a tungsten boride core and amorphous boron shell. Traditionally, wire tension tests of the composite fiber or hollow amorphous boron fiber have been conducted but this method would underestimate the strength due to the greater probability of defects along the long wire. Micropillar compression and tension testing enable us to determine mechanical properties of small materials accurately. In addition, the local atomic arrangement in amorphous boron has not been clearly understood because of the complexity in its amorphous structure. Therefore, it is necessary to conduct advanced transmission electron microscopy (TEM) to analyze the local structure at atomic resolution.

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