Regensburg 2022 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 30: Liquid and Amorphous Metals
MM 30.7: Talk
Thursday, September 8, 2022, 12:00–12:15, H46
Coupling deformation mechanisms in metallic glass-high entropy alloy nanolaminates — •Qi Xu1, Daniel Şopu1, and Jürgen Eckert1,2 — 1Erich Schmid Institute of Materials Science, Leoben, Austria — 2Montanuniversity leoben, Leoben, Austria
The uniaxial tensile deformation behavior of metallic glass (MG) - high entropy alloy (HEA) nanolaminates is explored through molecular dynamics simulations. The combination of glassy and crystalline nanolayers results in misfit stresses at the interface that drive the partial crystallization of amorphous phase and the nucleation of short dislocations. Upon loading, the further stress-induced crystallization facilitates the nucleation and growth of dislocations along the interfacial regions and across the HEA plate, which advances the yielding of MG-HEA nanolaminate. The dislocations are absorbed into the amorphous plate via slip transfer across glass-crystalline interface that in turn triggers the activation of homogeneously distributed STZs. The co-deformation mechanism suppresses the formation of critical shear bands and increases the resistance to dislocation motion that, consequently, promotes enhanced ductility in MG-HEA nanolaminate. The strength combination of HEA and MGs and the complex deformation behavior may overcome the typical strength-ductility trade-off and make MG-HEA laminates promising candidates for a variety of structural and functional applications.