Fatigue pre-cracking and toughness of the Zr55Cu30Al10Ni5 bulk metallic glass for two oxygen levels
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Cited by (27)
Influence of as-cast spherulites on the fracture toughness of a Zr<inf>55</inf>Cu<inf>30</inf>Al<inf>10</inf>Ni<inf>5</inf> bulk metallic glass
2019, Materials Science and Engineering: ACitation Excerpt :It suggests that spherulites guide the crack along the notch plane during its initiation and the first part of its propagation. The same observation was previously reported for a similar BMG containing dendrites by Keryvin et al. [33]. Fig. 6 provides views of some spherulites from batches MI and MII observed in the mode I zone with a higher magnification.
A quantitative connection between shear band mediated plasticity and fracture initiation toughness of metallic glasses
2018, Acta MaterialiaCitation Excerpt :i) Only studies that reported the mode I fracture toughness of notched specimens were considered.3 KIc data obtained from fatigue pre-cracked specimens were not considered as the pre-cracking procedure introduces mixed mode conditions in the crack tip field (as the curved SBs emanate at ∼45° to the notch plane) and also can affect the internal state of the material [31,32]. ( ii) Only those data, where the thickness requirements for a valid plane strain toughness measurement were met, was utilized.
Test sample geometry for fracture toughness measurements of bulk metallic glasses
2018, Acta MaterialiaEffect of the stress ratio on the fatigue behavior of Zr<inf>55</inf>Al<inf>10</inf>Ni<inf>5</inf>Cu<inf>30</inf> bulk metallic glass part I — Analysis of the fatigue resistance
2018, IntermetallicsCitation Excerpt :Interestingly, the correlation between fatigue resistance and the fracture toughness of BMGs remains not fully understood, since Zr60Cu30Al10 (KIc = 110 MPa m1/2) has been reported to be more sensitive to fatigue failure than a less tough Zr50Cu40Al10 (KIc = 51 MPa m1/2) [20]. Besides, unlike conventional crystalline metals, the fracture toughness of BMGs depends strongly on the loading rate [13,15] and the content of oxygen [21], inducing an experimental difficulty to assess the actual toughness value of the specimen under fatigue loading. In order to get an overview of the fatigue properties of BMGs, numerous studies have been performed to better grasp the effect of several parameters on the fatigue properties and crack propagation behavior, such as effect of loading mode [22], effect of loading rate [23,24], size effect [25], effect of the environment [26–29] or effect of free volume and residual stress [15].