Details

Autor(en) / Beteiligte

• Sun, Honghong
• Wang, Man
• Xi, Xiaoli
• Nie, Zuoren

Titel

Effects of formation of complex oxide dispersions on mechanical properties and microstructure of multi-doped W alloys

Ist Teil von

• Materials science & engineering. A, Structural materials : properties, microstructure and processing, 2021-09, Vol.824, p.141806, Article 141806

Ort / Verlag

Lausanne: Elsevier B.V

Erscheinungsjahr

2021

Link zum Volltext

Quelle

ScienceDirect

Beschreibungen/Notizen

• W alloys prepared via oxide dispersion strengthening have shown enhanced mechanical performance. In this paper, W-1.10 vol% Zr-2.00 vol% Y2O3 (WZY) and W-1.10 vol% Zr-2.00 vol% Er2O3 (WZE) were fabricated to investigate the effects of formation of complex oxide dispersions on mechanical properties and microstructure of multi-doped W alloys. By controlling the atomic ratio of added ZrH2 and rare earth oxides through composition design, the goal of complete formation of complex oxide particles with pyrochlore structure (A2B2O7) was achieved. Electron probe microanalysis (EPMA) and transmission electron microscopy (TEM) results showed that these dispersion particles in WZY and WZE were Y2Zr2O7 and Er2Zr2O7, respectively. Moreover, microstructure analysis showed that Er2Zr2O7 exhibited smaller size, higher number density and more homogenous distribution compared to Y2Zr2O7, which led to finer grains of WZE (0.58±0.03 μm) compared to WZY (1.34±0.29 μm). Finer microstructure including smaller grains and dispersion particles of WZE contributed to its higher strength and better ductility. Furthermore, the formation mechanism of complex oxide dispersion particles was discussed in detail. •W–Zr–Er2O3 (WZE) and W–Zr–Y2O3 (WZY) were fabricated to investigate the effects of formation of complex oxide dispersions on W alloys.•By controlling the atomic ratio of Zr:Y/Er to be 1:1, the complete formation of complex oxide particles with pyrochlore structure A2B2O7 were achieved.•The formation of Er2Zr2O7 and Y2Zr2O7 can be explained by the mechanism of dissolution-reprecipitation.•Finer Er2Zr2O7 (44.37 nm) with a higher number density distributed more homogeneously in WZE compared to Y2Zr2O7 (92.65 nm), which made WZE have higher bending strength and better ductility performance compared to WZY.