October 4-9, 2015
The fracture strength of a W-Cr10-Ti2 alloy, manufactured through mechanical alloying and subsequent hot isostatic pressing, has been measured through means of micro-cantilever testing at the Culham Materials Research Facility. The material is a product of ongoing work into self-passivating Tungsten alloys at CEIT, Spain  and was chosen for this work due to its fine micro-structure (average grain size
Heavy ion implantations to a depth of 3.5µm and an average damage of 0.7 and 7dpa were conducted at RBI, Zagreb in order to assess the effects of nuclear fusion relevant irradiation damage on the fracture strength of the material. Nano-indentation with pile-up correction showed an increase in hardness of 10% and 15% respectively. Results from micro-cantilever testing showed an apparent increase in the elastic modulus with implantation. This is not yet fully understood but similar effects have been reported in work on pure Tungsten previously . A decrease in fracture strength by 10% was observed after implantation to 0.7dpa. For the 7dpa implanted material a slight increase in fracture strength was measured. This however changes to a decrease of 15% when normalized to the nano-indentation measured elastic modulus. Explanations for both the increase in the elastic modulus as well as the proportional effect on fracture strength measurements will be discussed.
 P. López-Ruiz, J. Nucl. Mater. 442 (2013) S219-S224.  J. Gibson, Phys. Scr. T159 (2014) 014056