Relaxation and crystallization studied by observing the surface morphology evolution of atomically flat Pt57.5Cu14.7Ni53P22.5 upon annealing

SCRIPTA MATERIALIA

卷:182

Article

Chen, Zheng¹  Datye, Amit¹  Ketkaew, Jittisa¹  Sohn, Sungwoo¹  Zhou, Chao¹  Dagdeviren, Omur E.¹  Schroers, Jan¹  Schwarz, Udo D.^1,2 

[1] Yale Univ, Dept Mech Engn & Mat Sci, New Haven, CT 06511 USA

[2] Yale Univ, Dept Chem & Environm Engn, New Haven, CT 06511 USA

关键词: Bulk metallic glass;    Relaxation;    Crystallization;    Atomic force microscopy;    Annealing;   

DOI  :  10.1016/j.scriptamat.2020.02.035

来源: Elsevier

【 摘 要 】

The evolution of the surface morphology of Pt57.5Cu14.7Ni53P22.5 bulk metallic glasses thermoplastically formed by replication of SrTiO3 single crystals during heat treatments is investigated by atomic force microscopy. Due to the unique imprinting process, the surface of the bulk metallic glass features a terraced structure with sub-angstrom surface roughness. Upon heating over the material's glass transition temperature, the surface rearranges and relaxes towards a more stable, denser packed glass by smoothening out steps and increasing on-terrace surface roughness. With further increasing annealing temperatures, substantial surface alterations are observed because of increased arrangement kinetics and the onset of crystallization. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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