Orientation-dependence of incipient plasticity in a coarse-grained Mg revealed by nanoindentation pop-ins by Moein Imani Foumani, Syed Taha Khursheed, Yushun Liu, Guo-zhen Zhu

“…The estimated activation volume of the first pop-in was approximately 27–40 ų (involving about ∼2 atoms), aligning with reported atomistic simulations of the surface dislocation semi-loop nucleation. While indented near the ⟨c⟩-axis, grains exhibit higher first pop-in loads and successive pop-ins, implying the possibility of a cross-slip nucleation mechanism to accommodate ⟨c⟩-axis deformation.…”
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