Deformation characteristics in 6H-silicon carbide: effects of loading rate, length scale and irradiation

Silicon carbide (SiC) is a crystalline material and exhibits superior mechanical properties and excellent chemical inertness. Consequently, it has been used in various applications which require high durability and strength. Despite the extensive efforts made in investigating the mechanical behaviour of SiC, there are several research gaps which require continuous attention and further research effort. Particularly, the failure mechanism, impact-induced plasticity and deformation behaviour across length scales are not fully understood for SiC. In addition, SiC was proposed as a candidate structural material for nuclear fusion reactor core, and therefore it is of importance to study its resistance to high-dose irradiation damage. The aim of this research was to provide a systematic understanding of deformation characteristics of SiC using various experimental techniques and microscopy tools, with focus on the effects of loading rate, varying length scales and irradiation. Firstly, quasi-static compression tests were conducted to illustrate the basic failure mechanism and to obtain the mechanical properties such as elastic modulus and compressive strength of the material. [Continues.]