Behaviour of tungsten alloy with iron and nickel under repeated high temperature plasma pulses

•Resistance to powerful deuterium plasma pulses of dual phase W alloy with 3–5% Ni/Fe mixture is investigated.•Ni/Fe alloy between W grains leads to the decreased development of a mesh cracks on the surface of material as the whole.•Ni/Fe alloy’s behaviour as an absorber between the W grains leads to decrease of the depth of cracks.