Ductilizing Mo alloys via nanoparticle-stabilized microstructural hierarchy

Figures & data

Figure 1. Representative EBSD IPF coloring maps of Mo-0.6LaO alloy (a–c), Mo-0.3LaO alloy (d–f), and pure Mo (g–h) annealed at T_a = 1050°C (a,d,g), 1200°C (b, e, h), and 1400°C (c,f), respectively. Statistical results of the T_a -dependent average grain size are shown in (i).

Figure 2. Magnified EBSD IPF coloring maps of pure Mo (a, b), Mo-0.3LaO (c), and Mo-0.6LaO (d) annealed at T_a = 1050°C (a,c,d) and 1200°C (b), respectively, to clearly show the LAGBs (white lines within the grain interior). Statistical results on the boundary misorietation distribution in pure Mo (e), Mo-0.3LaO alloy (f), and Mo-0.6LaO alloy (g) annealed at different temperatures. (h) Statistical results of the P_LAGB evolving with the annealing temperature and La₂O₃ addition.

Figure 3. Representative SEM (a) and TEM (b) images to show the coarse La₂O₃ particles and nanosized La₂O₃ particles in the Mo-0.6LaO alloy, respectively. Both particles are respectively indicated by red arrows. Statistical results on the average size (d_c or d_n) and volume fraction (f_c or f_n) of the two types of particles (c: coarse La₂O₃, d: nanosized La₂O₃ particles).

Figure 4. (a)Tensile stress vs strain curves of the pure Mo, Mo-0.3LaO alloy, and Mo-0.6LaO alloy annealed at different temperatures. Variation of yield strength (b) and tensile elongation (c) with La₂O₃ addition at different annealing temperatures. (d) Calculations of normalized elongation evolving with La₂O₃ addition at different d_c, in comparison with the experimental results at T_a = 1050°C.

Figure 5. Representative SEM images to compare the fracture surface of pure Mo annealed at 1200°C (a,d), Mo-0.3LaO (b,e), and 0.6 LaO (c f) at 1400°C.