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Fatigue testing of bended metallic glass on stretching and curve


Characteristic features of growth of fatigue cracks on the basis of cobalt and nanocrystalline alloys iron are established. It is shown that in tensile tests in the region of fracture initiation, viscous destruction takes place with the formation of dense microtights. The characteristic size of such coils is ~0.5-1.5 μm. Holders of crack growth, similar to chipping appear. In the transition zone, classes of formation of larger deformation structures and cells are also observed. The main zone of growth of the fatigue crack develops like a cleave with the formation of a “vintage pattern”. It is determined that during the bend tests the nucleation of cracks is fragile. Near the edges of the sample, the crack can pass into parallel planes, whereas in the center of the sample its growth occurs along a single plane. The crack originates from the side of the surface with tensile stresses in several planes. By the nature of the formation of deformation relief and destruction, it is possible to assume the origin of intrusions and extrusions. It is established that the cracks propagate in several planes. The initiation of a crack occurs on the intrusion. Along the trajectory of crack growth there are shifts-extrusions. Branching of cracks and shifts on the crack edges during bend tests was not observed. There is also no “vein pattern” on the surfaces of the crack. It is noted that the number of cycles leading to failure in bending tests at equal stresses is significantly higher than the number of cycles leading to failure during tensile tests.


deformation; fatigue; crack; stretching; bending; intrusion; extrusion

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