Thermal change of microstructure and mechanical properties of dispersion strengthened tungsten

Abstract

Using a Mechanical Alloying (MA)-Hot Isostatic Pressing (HIP) method, new dispersion strengthened tungsten (DS-W) alloys containing TiO2 particles on grain boundaries have been developed for improvement of Plasma Facing Materials (PFM) for divertor components of fusion reactors. In this study, effects of the dispersion strengthening on the thermal change of microstructure and the thermal conductivity at high temperature were investigated. Within contrast to Pure Tungsten, the DS-W did not show significant microstructural change or a drastic decrease of the bending strength after annealing at high temperature.

Effect of Ball Diameter on Mechanical Alloying Process for the Production of Dispersion Strengthened Tungsten

“…For the solution of the problem, the suppression of embrittlement by the increase of recrystallization temperature have been tried in studies of (1) and (4). On the other hand, there is a materials design which can avoid embrittlement even after recrystallization on DS-W (5) including the effects of grains pinning [7] or grain boundary strengthening [8,9]. Regarding the previous studies about DS-W author's e-mail: noto.hiroyuki@nifs.ac.jp strengthening nano-particles in matrix, the DS-W can be classified in term of kind of the nano-particle in matrix as follows, W-lanthanum (La) compound [10], W-yttrium (Y) compound [11], Y-titanium (Ti) composite compound [12], TiO 2 applied REDOX (oxidation-reduction reaction) effect between TiC and impurity in our previous study [13], TiC [14].…”