The Effect of Twins on the Mechanical Behavior of Boron Carbide

Report No. ARL-RP-368
Authors: Tomoko Sano; Charles L. Randow
Date/Pages: May 2012; 10 pages
Abstract: The microstructure and mechanical properties of boron carbide (B4C) samples processed by slip casting were compared with those processed by the conventional hot-pressing technique. Although the quasi-static and dynamic mechanical experiments showed comparable results between the slip-cast and hot-pressed B4C, scanning electron microscopy and electron back-scattered diraction of the B4C samples revealed signicant dierences in the microstructure. A notable dierence was the numerous growth twins in the slip-cast samples. The twin planes were determined to be {1011} and consisted of 35 pct of the boundary population in the slip-cast B4C but only 1 pct of the boundary population in the hot-pressed B4C. It was hypothesized that the presence of twins will cause a dierent failure mechanism. The eect of the twins on the stress state was examined by nite-element simulations and will also be discussed.
Distribution: Approved for public release
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Last Update / Reviewed: May 1, 2012