Comparison of incipient plasticity in bcc and fcc metals studied using nanoindentation

Effect of the Spherical Indenter Tip Assumption on the Initial Plastic Yield Stress

“…4, there is no statistically significant effect of the load (and therefore stress) at yield due to indentation rate over the range tested. The experimentally observed results are similar to the results by Rajulapati et al (2010), Wang et al (2011), andVadalakonda et al (2006) in that the onset of plasticity is not significantly impacted by the loading rate for Ta (bcc), Mo (bcc), and Ni (fcc) single crystals, and polycrystalline W, Fe, and Ni. This suggests that the rate dependence observed by Mason et al (2006) and Schuh and Lund (2004) in Pt may imply there are multiple processes that control the onset of plastic deformation, and that loading rate may impact some, but not all, of these processes.…”

Synthesis, microstructure, and mechanical properties of YPd3B thin films

“…Fig. 6 compares the critical shear stresses for a variety of materials available in the literature (Cu [37][38][39], Al [37], Au [40,41], Ag [42], Ni [39,43,44], Ta [45], Fe/steel [44,46,47], Mo [43], W [36,44,48], Ir [49], Cr 3 Si [50], GaN [51], MgO [52], Al 2 O 3 [53], ZrN [54], ZrB 2 [55], SiC [56]) with those for the YPd 2.73 B 1.18 and Pd films in the present study. The corresponding shear moduli are obtained from the literature [7,14,[57][58][59][60][61][62][63][64][65].…”

Depinning-controlled plastic deformation during nanoindentation of BCC iron thin films and nanoparticles

“…Generally, one would expect that in a depinning-controlled deformation will be characterized by a larger number of strain burst events during the indentation. Indeed, Vadlakonda et al [41] found that the displacement bursts are more pronounced and also more frequent in case of iron as compared with nickel. In fact, tungsten was also found to have more pronounced and frequent strain burst, which leads us to suggest that the discussion here is not limited to iron but is general to BCC metals.…”