High-Pressure Torsion Deformation Induced Phase Transformations and Formations: New Material Combinations and Advanced Properties

TL;DR

This paper reviews high-pressure torsion deformation as a method to create novel metastable materials and nanocomposites with tailored properties for advanced applications like hydrogen storage and radiation resistance.

Contribution

It introduces a new processing approach using HPT deformation to generate bulk metastable materials and nanocomposites with customizable properties.

Findings

HPT can produce microstructures similar to mechanical alloying.

Bulk samples of metastable materials are obtained directly during HPT.

Materials with specific tailored properties can be synthesized for various applications.

Abstract

Heavy plastic shear deformation at relatively low homologous temperatures is called high-pressure torsion (HPT) deformation, which is one method of severe plastic deformation (SPD). The aim of the paper is to give an overview of a new processing approach which permits the generation of innovative metastable materials and novel nanocomposites by HPT deformation. Starting materials can be either coarse-grained multi-phase alloys, a mixture of different elemental powders or any other combination of multiphase solid starting materials. After HPT processing, the achievable microstructures are similar to the ones generated by mechanical alloying. Nevertheless, one advantage of the HPT process is that bulk samples of the different types of metastable materials and nanocomposites are obtained directly during HPT deformation. It will be shown that different material combinations can be selected and materials with tailored properties, or in other words, materials designed for specific applications and the thus required properties, can be synthesized. Areas of application for these new materials range from hydrogen storage to materials resistant to harsh radiation environments.