Nanomechanical properties of Al-Tb marginal metallic glass

Date

2023-11-17

Author

Okuyucu, Can
Ulucan, Tolga Han
Abboud, Mohammad
Motallebzadeh, Amir
Özerinç, Sezer
Kalay, İlkay
Kalay, Yunus Eren

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Al-Rare Earth (RE) metallic glasses provide an effective model system to study the effect of nanocrystallites in an amorphous matrix on nanomechanical behavior. In this work, we achieved a series of Al-Tb metallic glass-crystalline composites with systematically varying crystalline content through annealing. The nanomechanical properties were characterized using micropillar compression tests and nanoindentation for as-quenched amorphous and annealed amorphous/nanocrystalline composite specimens. The promising hardness increases after annealing from 3.0 GPa to 4.6 GPa and elastic modulus increment from 68 GPa to 92 GPa were discussed in detail, considering the structural features of Al-RE marginal metallic glass formers. The increase in elastic modulus is associated with the nucleated fcc-Al nanocrystals that divide the amorphous matrix, leading to the branching of the shear bands. The correlation between the fcc-Al nanocrystals and the behavior of shear bands was discussed in detail.

Subject Keywords

Aluminum alloys, Amorphous materials, Metallic glasses, Micropillar compression, Nanocrystalline materials

URI

https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85174609697&origin=inward
https://hdl.handle.net/11511/106248

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Department of Metallurgical and Materials Engineering, Article