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Figure 9. Mechanical properties of tungsten wire and the relationship between the strengthening of tungsten wire. CeO-wire: CeO-added tungsten wire, SP-wire: single phase tungsten wire without CeO addition: (A) Engineering stress-strain curves of tungsten wire with different strains (0, 1.77, 3.04, 4.00, 4.6, and 4.87); (B) Corresponding tensile strength and yield strength and fracture of tungsten wire at ε = 4.87 after tension, error bars denote standard deviation from measurements of no less than 3 specimens per group; (C) the grain retaining rate versus the drawing strain. (D) The relationship between the yield strength of tungsten wire and the boundary spacing D-1/2. TEM micrographs and corresponding NBD diffraction patterns of (E) CeO-added tungsten wire and (F) single phase tungsten wire at
