Figure 1

SEM observation results for fractographies of two BMGs under three-point bending fracture (A, B, and C represent notch position, mirror zone, and river pattern zone). (a) Fractography of the Dy-based BMG. (b) Detail morphology near the notch corresponding to point I in (a). (c) Detail morphology of the mirror zone corresponding to point II in (a). (d) Fractography of the Mg-based BMG. (e) Detail morphology near the notch corresponding to point I in (d). (f) Detail morphology of the mirror zone corresponding to point II in (d). [Arrows in (a) and (d) indicate the crack propagation direction].Reuse & Permissions

Figure 2

AFM results for the mirror zone on the fracture surface of two BMGs. Cracks propagate along the $X$ direction. The corrugation height was measured by Nanoscope III software.) (a) 3D image for the Dy-based BMG. (b) Section shape of the corrugation being along a dashed line in (a), i.e., the crack propagation direction. (c) Section shape of the corrugation being along a solid line in (a), i.e., perpendicular to the crack propagation direction. (d) 3D image for the Mg-based BMG. (e) Section shape of the corrugation being along a dashed line in (d), i.e., the crack propagation direction. (f) Section shape of the corrugation being along a solid line in (d), i.e., perpendicular to the crack propagation direction.Reuse & Permissions

Figure 3

(a),(b) A comparison of left and right surfaces of the Mg-based BMG observed by AFM. (Arrows indicate the crack propagation direction. Triangles point out the reference points that indicate the peak-to-peak match.) (c),(d) The comparison of left and right surfaces of the Mg-based BMG by SEM (arrows are guidelines for peak-to-peak matching). (e),(f) Section shapes of the corrugations being along dotted lines in (a) and (b). (The arrow indicates the crack propagation direction.) Dash-dotted lines clearly indicate the peak-to-peak match.Reuse & Permissions

Figure 4

(a) Sketch illustrating the crack tip opening mechanism (crack propagates along the $X$ direction). Crack extension by the peak-to-peak separation of the corrugation on the $X\mathrm{\text{−}}Y$ plane and the infinitesimal perturbation on the crack front on the $X\mathrm{\text{−}}Z$ plane ($\lambda$ is the wavelength of the initial perturbation). (b) The microvoid formation mechanism in the plastic zone.Reuse & Permissions