Influence of topological structure and chemical segregation on the thermal and mechanical properties of Pd–Si nanoglasses

Mechanical Properties of Glassy Nanopillars: A Comparative, Computational Study of Size Effects in Nanoglasses and Homogeneous Bulk Glasses

“…Structural relaxation due to the high compaction rate used in simulation during the preparation of the NG may change the deformation mode. Indeed, a recent study on the compression test of Pd-Si NG nanopillar with a diameter of 36 nm showed a change in the deformation mode from homogeneous deformation to shear banding when the nanopillar is cut from an annealed NG (Nandam et al, 2020). The effect of annealing on the change of the deformation mode was also reported in a recent experiment and simulation study on Zr-Ni-Al nanosized metallic glasses (Liontas et al, 2016).…”

Nanoindentation of Nanoglasses Tested by Molecular Dynamics Simulations: Influence of Structural Relaxation and Chemical Segregation on the Mechanical Response

“…As it comes to the yielding mechanism, shear bands were observed in uniaxial microcompression tests and nanoindentation of Pd 80 Si 20 nanoglasses (Nandam et al, 2020;Sharma et al, 2021), while similar experimental tests of Sc 75 Fe 25 , Cu 50 Zr 50 , and Cu 60 Zr 40 nanoglasses revealed that these nanoglasses deform homogeneously (Fang et al, 2012;Wang et al, 2015;Nandam et al, 2017;Sharma et al, 2021).…”

“…The lower stiffness of the nanoglasses were attributed to sample porosity by Arnold et al (2020). Nanoindentation of Sc 75 Fe 25 and Cu 50 Zr 50 , in contrast, revealed that Young's moduli and hardness values of these nanoglasses are higher than those of the metallic glasses with identical chemical composition (Franke et al, 2014;Nandam et al, 2017Nandam et al, , 2020. This was explained by segregation effects and the resulting different chemical bonding in the interfaces (Nandam et al, 2020).…”

“…The microstructure of nanoglasses consists of glassy grains connected by glass-glass interfaces (Ritter et al, 2011;Ivanisenko et al, 2018). These interfacial regions are characterized by an excess volume (Jing et al, 1989;¸Sopu et al, 2009), a defective short-range order (SRO) (Ritter et al, 2011), and a different composition as compared to the grain interiors Albe, 2016, 2018;Wang C. et al, 2016;Nandam et al, 2017Nandam et al, , 2020.…”

“…In order to see whether nanoglasses have superior mechanical properties over their metallic glass counterparts, several experimental studies of Fe-Sc, Cu-Zr, and Pd-Si nanoglasses were conducted in the past (Franke et al, 2014;Nandam et al, 2017Nandam et al, , 2020Arnold et al, 2020;Sharma et al, 2021). Ultrasonic measurements of Fe 86 Sc 14 , Fe 90 Sc 10 , Cu 58 Zr 42 , and Cu 60 Zr 40 nanoglasses showed that their Young's moduli are lower than those of the homogenous metallic glass counterparts (Arnold et al, 2020), which is in line with results obtained by nanoindentation of Fe 90 Fe 10 and Pd 80 Si 20 nanoglasses (Franke et al, 2014;Nandam et al, 2017Nandam et al, , 2020. The lower stiffness of the nanoglasses were attributed to sample porosity by Arnold et al (2020).…”