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The dynamic behaviour of thermally driven segregation of Cr to the surface ofWCrY smart alloy is studied with low energy ion scattering (LEIS). Sputteringthe WCrY sample with 500 eV D$_2^+$ ions at room temperature results inpreferential removal of the lighter alloy constituents and causes an almostpure W surface layer. At elevated temperatures above 700 K the segregation ofCr atoms towards the surface sets in and prevents the formation of a pure Wlayer. The simultaneous heating and sputtering of the sample leads to a surfacestate which reflects the balance between sputter removal and segregation flux,and deviates from the equilibrium due to thermally driven segregation. Stoppingthe sputter ion beam allows the system to relax and develop toward thesegregation equilibrium. The time constants for the temporal changes of W andCr surface coverage are obtained from a series of LEIS measurements. Thesegregation enthalpy is determined from the time constants obtained for varioussample temperatures.

Temporally resolved LEIS measurements of Cr segregation after preferential sputtering of WCrY alloy