Impact of pulsed deuterium plasma irradiation on dual-phase tungsten alloys

•Tungsten heavy alloys (W-HA) behavior under powerful fusion related plasma streams were studied.•The use of Fe-Ni alloy as the binder phase has decreased the development of cracks.•The layer of decreased microhardness of W-HA is decreased in comparison to pure tungsten. The morphological and structural changes of two different dual-phase tungsten alloy (either 3% or 5% of an added mixture of Fe and Ni) are investigated after deuterium plasma irradiation. Heat flux factor of deuterium plasma pulses is comparable to transient events in ITER. This study compares the changes in tungsten alloy materials between two different regimes with a different number of plasma pulses. Fe and Ni as a binder play an essential role in absorbing plasma shocks to decrease the morphological and structural changes. These results are compared to changes of pure single and double forged tungsten irradiated in similar conditions.