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Synthesis of Hybrid Nanocrystalline Alloys by Mechanical Bonding through High‐Pressure Torsion
Author(s) -
Han Jae-Kyung,
Herndon Taylor,
Jang Jae-il,
Langdon Terence G.,
Kawasaki Megumi
Publication year - 2020
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201901289
Subject(s) - materials science , nanocrystalline material , microscale chemistry , intermetallic , nucleation , severe plastic deformation , amorphous solid , torsion (gastropod) , metastability , nanocomposite , amorphous metal , plasticity , alloy , nanoscopic scale , metallurgy , composite material , nanotechnology , crystallography , thermodynamics , medicine , chemistry , mathematics education , mathematics , physics , surgery , quantum mechanics
An overview of the mechanical bonding of dissimilar bulk engineering metals through high‐pressure torsion (HPT) processing at room temperature is described in this Review. A recently developed procedure of mechanical bonding involves the application of conventional HPT processing to alternately stacked two or more disks of dissimilar metals. A macroscale microstructural evolution involves the concept of making tribomaterials and, for some dissimilar metal combinations, microscale microstructural changes demonstrate the synthesis of metal matrix nanocomposites (MMNCs) through the nucleation of nanoscale intermetallic compounds within the nanostructured metal matrix. Further straining by HPT during mechanical bonding provides an opportunity to introduce limited amorphous phases and a bulk metastable state. The mechanically bonded nanostructured hybrid alloys exhibit an exceptionally high specific strength and an enhanced plasticity. These experimental findings suggest a potential for using mechanical bonding for simply and expeditiously fabricating a wide range of new alloy systems by HPT processing.