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000874010 1001_ $$0P:(DE-Juel1)130066$$aKoslowski, Hans Rudolf$$b0$$eCorresponding author
000874010 245__ $$aSegregation and Preferential Sputtering of Cr in WCrY Smart Alloy
000874010 260__ $$aAmsterdam [u.a.]$$bElsevier$$c2020
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000874010 520__ $$aThe temperature driven segregation of Cr to the surface of the tungsten-based WCrY alloy is analysed with low energy ion scattering of He+ ions with an energy of 1 keV in the temperature range from room temperature to 1000 K. Due to the high surface sensitivity, these measurements probe only the composition of the outermost monolayer. The surface concentration of Cr increases slightly when the temperature of the sample is increased up to 700 K and exhibits a much stronger increase when the sample temperature is further raised. The segregation enthalpy for Cr is obtained from the Langmuir-McLean relation and amounts to 0.7 eV. The surface concentration of Y shows a similar behaviour to the Cr concentration. The temperature thresholds between slow and accelerated surface density increases for Cr and Y are nearly the same. At a temperature of 1000 K the low energy ion scattering detects almost no W on the surface. The modified surface composition due to the segregated species, i.e. the mixed Cr/Y layer, stays stable during cool-down of the sample. Preferential sputtering is investigated using ion bombardment of 250 eV D atoms, resulting in an increase of the W surface density at room temperature. This effect is counteracted at elevated temperatures where segregation replenishes the lighter elements on the surface and prevents the formation of an all-W surface layer. The flux of segregating Cr atoms towards the surface is evaluated from the equilibrium between sputter erosion and segregation.
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000874010 7001_ $$0P:(DE-Juel1)166256$$aSchmitz, Janina$$b1$$ufzj
000874010 7001_ $$0P:(DE-Juel1)157640$$aLinsmeier, Christian$$b2
000874010 773__ $$0PERI:(DE-600)2808888-8$$a10.1016/j.nme.2020.100736$$gp. 100736 -$$p100736 -$$tNuclear materials and energy$$v22$$x2352-1791$$y2020
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