27:T538,

This study provides key insights into the critical role of nanoparticle distribution in oxide dispersion-strengthened (ODS) powders for laser powder bed fusion (PBF-LB/M). A comparative analysis of mechanical (ball milling, BM) and liquid-based (dielectrophoretic deposition, DD) additivation methods was conducted to produce ODS feedstocks by integrating 1 vol.-% yttria (Y₂O₃) nanoparticles into Fe20Cr metal powder. ODS materials enhance high-temperature strength and creep resistance by dispersing fine, stable oxide particles within a metal matrix. This makes the precise size and distribution of nanoparticles crucial in the final bulk material. Powder characterisation shows that while both methods produce powders suitable for high-density parts, the DD method achieves higher uniform nanoparticle distribution, with smaller average particle sizes (74 nm) and interparticle distances (826 nm). In contrast, longer milling durations resulted in slightly larger particle sizes (77 nm) and distances (790 nm), while shorter milling times produced even larger nanoparticles (108 nm) with greater interparticle distances (1114 nm). These results suggest that DD offers advantages in optimising the distribution of oxide nanoparticles to enhance the strengthening effects in high-temperature applications.

28:T514,

The WC-10Co cemented carbides containing (ZrHfNbTaTiMo)C high-entropy carbide with satisfactory comprehensive mechanical properties were successfully manufactured by conventional vacuum sintering. The influences of (ZrHfNbTaTiMo)C contents (0, 0.5, 1, 5, 10 wt.%) on the densification degree, microstructure, grain size and mechanical properties were investigated. The results showed that the addition of (ZrHfNbTaTiMo)C deteriorated the wettability between Co and WC, leading to a decline in relative density. (ZrHfNbTaTiMo)C inhibited the growth of WC grains, and the average grain size of WC continued to decrease with the increase of (ZrHfNbTaTiMo)C content. After adding (ZrHfNbTaTiMo)C, the hardness and toughness rose first and then descended. When the content of (ZrHfNbTaTiMo)C was 1 wt.%, the hardness and toughness reached the maximum value of 16.77 GPa and 10.45 MPa·m^1/2, respectively. Moreover, the structure was a dual-grain structure, with many high-aspect-ratio rectangular grains in the sintered samples added by 0.5 wt.% and 1 wt.% (ZrHfNbTaTiMo)C. This special structure not only enhanced the hardness, but also compensated the loss of toughness. After doping 0.5 wt.% CeO₂, the hardness decreased slightly, while the toughness increased to 12.42%.

29:T64a,