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Highlights-Mechanical properties of amorphous SiOC were investigated by insitu SEM compression.-Irradiation increases both strength and plasticity by improving film quality.-Microstructural homogeneous amorphous SiOC are intrinsically strong and deformable. digitalcommons.unl.edu

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Boron carbide has a nominal stoichiometry of B 4 C and is comprised of 12-atom boron-rich icosahedra (located at the vertices of a rhombohedral unit cell of trigonal symmetry) that are connected by three-atom chains of carbon and/or boron along the [1 1 1] rhombohedral axis. Alternatively, the crystal structure can be described by a non-primitive hexagonal unit cell with the [0 0 0 1] hexagonal axis coinciding with the [1 1 1] rhombohedral direction. 1 The extended network of icosahedral units and strong covalent bonds give boron carbide a low density