“…Over the last fifty years numerous investigations have been carried out with the aim of improving the understanding of the fracture behaviour. Most studies relating to the ductility of tungsten materials were done in the fifties, sixties and few in the seventies [2][3][4][5][6][7]. GB impurities, which were thought to be one of the main causes of intergranular fracture, were investigated to determine the effect of particularly carbon (C), oxygen (O), potassium (K) and phosphorous (P) [8][9][10].…”