The role of minor alloying in the plasticity of bulk metallic glasses

SCRIPTA MATERIALIA

卷:188

Article

Hilke, Sven¹  Roesner, Harald¹  Wilde, Gerhard¹ 

[1] Westfalische Wilhelms Univ Munster, Inst Mat Phys, Wilhelm Klemm Str 10, D-48149 Munster, Germany

关键词: Bulk metallic glass;    Micro-alloying;    Fluctuation electron microscopy;    Diffraction;    Amorphous;    Deformation;   

DOI  :  10.1016/j.scriptamat.2020.06.070

来源: Elsevier

【 摘 要 】

Micro- or minor alloying of metallic glasses is of technological interest. An originally ductile Pd-based monolithic bulk metallic glass (Pd40Ni40P20) was selectively manipulated by additions of Fe or Co. The alloying effects were extreme, showing either exceptional ductility upon Co addition or immediate catastrophic failure upon Fe addition when tested under uniaxial compression or 3-point bending. The amorphous structure was characterized prior to deformation with respect to its medium-range order (MRO) using variable resolution fluctuation electron microscopy (VR-FEM). We observe striking differences in the MRO between the ductile and brittle metallic glasses, with the ductile glasses exhibiting a rich structural diversity and MRO correlation lengths up to 6 nm. The MRO diversity seems to enable easier shear banding and hence enhance the deformability. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free