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Microstructure and microhardness evolution in pure molybdenum processed by high-pressure torsion.

Wang, X., Li, P., Huang, Y., Gao, N. and Langdon, T.G., 2020. Microstructure and microhardness evolution in pure molybdenum processed by high-pressure torsion. Advanced Engineering Materials, 1901022. (In Press)

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DOI: 10.1002/adem.201901022

Abstract

Molybdenum, a refractory metal with a body-centred cubic lattice, was processed by high-pressure torsion (HPT) at room temperature under an applied pressure of 6.0 GPa and torsional straining from 1/2 to 10 turns. The microstructures were characterized by electron back-scatter diffraction (EBSD) and transmission electron microscopy (TEM) and measurements were taken of the Vickers microhardness. The results show a gradual evolution of homogeneity in grain size and microhardness with increasing numbers of HPT turns with an average grain size of ~690 nm at the sample edge after 5 turns and a saturation microhardness of ~660 Hv. The grain size after 10 turns showed a slight decrease at the centre and the microhardness was slightly lower than after 5 turns due to the occurrence of limited dynamic recovery.

Item Type:Article
ISSN:1438-1656
Additional Information:Funding Information National Natural Science Foundation of China. Grant Numbers: 51705118, 51675154 Fundamental Research Funds for the Central Universities. Grant Numbers: JZ2019HGTA0048, JZ2019HGBZ0173 European Research Council. Grant Number: 267464-SPDMETALS
Uncontrolled Keywords:High-pressure torsion; microhardness; microstructural evolution; molybdenum; ultrafine grains
Group:Faculty of Science & Technology
ID Code:33021
Deposited By: Unnamed user with email symplectic@symplectic
Deposited On:11 Nov 2019 10:13
Last Modified:18 Dec 2019 13:17

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