Synthesis of hybrid nanocrystalline alloys by mechanical bonding through high-pressure torsion

Abstract

This review provides an overview of the mechanical bonding of dissimilar bulk engineering metals through high-pressure torsion (HPT) processing at room temperature. 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 macro-scale microstructural evolution involves the concept of making tribomaterials and, for some dissimilar metal combinations, micro-scale microstructural changes demonstrate the synthesis of metal matrix nanocomposites (MMNCs) through the nucleation of nano-scale intermetallic compounds within the nanostructured metal matrix. Further straining by HPT during the mechanical bonding provides an opportunity to introduce limited amorphous phases and a bulk metastable state. The mechanically-bonded nanostructured hybrid alloys exhibit 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.

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ORCID for Terence G. Langdon: orcid.org/0000-0003-3541-9250

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