Effect of Ta addition on the fuzz formation of additively manufactured W-based materials

Abstract

As a divertor plasma-facing material, W will experience high -flux plasma irradiation. In particular, severe surface morphology change like fuzz formation can be induced by He plasma irradiation. In this study, fuzz formation on additively manufactured W and W-Ta was investigated. Rolled W, laser -powder -bed -fused (LPBFed) W and W-Ta were exposed to high flux (∼10 23 m −2 s −1 ) He plasma in the linear plasma generator Magnum-PSI with ion energy 12-13 eV at 1273 K. The mean thickness of the fuzz at grain interiors of rolled W, LPBFed W and W-Ta was measured as 0.37 µm, 0.71 µm and 0.23 µm, respectively. The fuzz suppression in LPBFed W-Ta can be attributed to the synergetic effect of solid-solution, dislocation, and secondary -phase nanoparticles. Abnormally grown fuzz was observed near the pre-existing cracks of LPBFed W, while no such structure was found in LPBFed W-Ta. It is found that dislocations play a crucial role in inhibiting fuzz growth. This is confirmed by the difference in fuzz structure in rolled W and LPBFed W, where rolled W has a much greater dislocation density compared to LPBFed W. This work suggests that the fuzz growth kinetics may be tuned by tailoring the microstructures using the LPBF technique.

Effect of octa(epoxycyclohexyl) POSS on thermal, rheology property, and foaming behavior of PLA composites

“…As for foaming materials, the cellular morphology plays a significant role in final use. It has been studied by many researchers to investigate the relationship between cellular structure and foams performances, such as the mechanic properties and thermal conductivity . The cellular morphology and the cellular structure parameters as a function of POSS content is shown in Figure and Table , respectively.…”

Effect of stereocomplex crystal on foaming behavior and sintering of poly(lactic acid) bead foams

“…For foaming materials, cellular morphology plays a significant role in final use. It has been studied by many researchers to investigate the relationship between cellular structure and foam performances, such as mechanical properties and thermal conductivity . Figure presents SEM images and Table summarizes cellular structure parameters of PLLA foams blended with various PDLA contents.…”

Laser Powder Bed Fusion of Unalloyed Tungsten: A Review of Process, Structure, and Properties Relationships

“…The addition of such phases has been widely used in powder metallurgy as a method for grain size refinement, oxidation restraining, and dislocation mobility improvement. Attempts to add small amounts (<6%wt) of tantalum and titanium as well as nano ZrC and Y 2 O 3 have shown promising results in terms of crack suppression and grain refinement in tungsten produced by LPBF [33,[80][81][82][83][84]. The underlying mechanisms by which such additions can change the produced microstructure/properties are however out of the scope of this review and have been discussed in a review by Li et al [23].…”