Tungsten Alloy Development as Advanced Target Material for High-Power Proton Accelerator

Tungsten (W) is a principal candidate as target material because of its high density and extremely high melting point. W inherently has a critical disadvantage of its brittleness at around room temperature (low temperature brittleness), recrystallization embrittlement, and irradiation embrittlement. TFGR (Toughened, Fine Grained, Recrystallized) W-1.1%TiC has been considered as a realized solution to the embrittlement problems. We started to fabricate TFGR W-1.1%TiC in 2016 under collaboration between KEK and Metal Technology Co., LTD (MTC). The TFGR W-1.1%TiC samples were successfully fabricated in June, 2018. As a result, the specimen showed slight bend ductility and 2.6 GPa of fracture strength. The TFGR W-1.1%TiC was included in the HRMT-48 PROTAD experiment on September 28th, 2018. After cooling, the post-irradiation-examination will be conducted for the irradiated TFGR W-1.1%TiC.