Mechanical performance of metallic glasses during nanoscratch tests

Investigating the Wear Behavior of Fe-Based Amorphous Coatings under Nanoscratch Tests

“…The coatings have a greater hardness and higher H/E value than does 304. As an important index of wear resistance, penetration depth depends strongly on hardness and H/E, which is to say that a greater hardness or higher H/E value leads to a lower penetration depth of the coatings, which agrees with other publications [20,22,31]. The difference between D during and D post reflects the elastic recovery of the material.…”

“…They found that the wear resistance of the investigated amorphous alloys does not follow the classical Archard equation, that is, the wear resistance is not linearly proportional to hardness. As a relatively newly developed technique, the nanoscratch test has been used in the investigation of several other bulk amorphous alloys [21][22][23], such as Ce-based, Ti-based, etc. However, the nanoscratch behavior of amorphous coating has not been yet reported.…”

Nanoindentation analysis of time-dependent deformation in as-cast and annealed Cu–Zr bulk metallic glass

“…Interestingly, these stress exponent values are similar to that for the dislocationecreepdominant mechanism in a crystalline material. Very limited studies on indentation creep [12,23] have reported the strong rate dependency of the stress exponent. In the studies, the trend of the stress exponent change with rate is controversial; for example, Huang et al [12] suggested that the exponent of Fe-based BMG decreases with indentation rate, which is opposite to the present result.…”

“…Also, Castellero et al [10] analyzed the room-temperature creep of two MgeCueY metallic glasses. Very recently, Huang et al [11,12] attempted to extend the room-temperature creep analysis to Fe-and Ti-based BMGs whose T g is not so low. Nevertheless, the influence of structural state on the room-temperature indentation creep of BMG is not yet fully understood.…”

Tensile Creep Characterization and Prediction of Zr-Based Metallic Glass at High Temperatures

“…The atomic diffusion perpendicular to the loading force constantly fills the new free volume, causing a high creep strain and high steady state creep rate, as shown in Figure 2. Here, it should be mentioned that the mechanical properties of metallic glass are strongly dependent on the sample size and the stiffness of the testing machine [54][55][56][57][58]. Han et al [54] suggested that catastrophic failure is dominated by a shear-band instability index which is proportional to the sample size and inversely proportional to the machine stiffness.…”