Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1573675 | Materials Science and Engineering: A | 2016 | 10 Pages |
Abstract
Commercial purity vanadium with an initial grain size of ~27 μm and a Vickers microhardness of Hvâ85 was processed by high-pressure torsion (HPT) under a pressure of 6.0 GPa at room temperature through 1/2 to 10 turns. After processing through 10 turns, some samples were immediately subjected to a short-term annealing (15 min) at different temperatures from 773 to 1173 K. The microstructures developed in HPT and in HPT plus post-HPT annealing were characterized by electron backscatter diffraction (EBSD). Processing by HPT for 10 turns gave a refined grain size of ~410 nm and an increased hardness of Hvâ240. Post-HPT annealing demonstrated that the ultrafine grained vanadium has good thermal stability up to at least 873 K. Tensile testing at room temperature gave an ultimate tensile strength of ~920 MPa after 10 turns of HPT with an elongation of ~29%. These results show HPT processing produces superior mechanical properties in vanadium by comparison with processing by ECAP or ECAP plus cryorolling.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Yi Huang, Mathilde Lemang, Nian Xian Zhang, Pedro Henrique R. Pereira, Terence G. Langdon,