期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2015.12.085
关键词
High-entropy alloy; High pressure torsion; Deformation twinning; Microhardness; Nanoindentation creep
类别
资金
- National Science Foundation of China [51271161/51171163/51121061]
- Specialized Research Fund for the Doctoral Program of Higher Education [20131333110019]
- U.S. Army Research Office project [W911NF-13-1-0438]
- National Science Foundation [CMMZ-1100080]
- Department of Energy, Office of Fossil Energy, National Energy Technology Laboratory [DE-FE-0008855, DE-FE-0011194, DE-FE-0024054]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1100080] Funding Source: National Science Foundation
High pressure torsion (HPT) under a pressure of 6 GPa through 1 and 2 revolutions have been used to follow the evolution of microstructures and properties in an Al0.1CoCrFeNi high-entropy alloy (HEA). The plastic-deformation mechanisms of the HEA include dislocation slip at low strains and twinning at high strains at room temperature. The planar dislocation slip on the normal face-centered-cubic slip system, {111)(110), and nanoscaled deformation twins with a thickness from several nanometers to 40 nm, accompanied with some secondary twins. The hardness of the Al0.1CoCrFeNi HEA increases from 135 Hv at hot-isostatic pressed (HIPed) state to about 482 Hv after HPT processing. The HEAs have a relatively high initial hardness and high work hardening, compared with traditional alloys. The creep resistance of the HEA processed by HPT was determined by a nanoindentation technique. The strain rate sensitivity, m, increases with the decreasing of grain size, for smaller activation volume and the dominant deformation mechanism changing from the dislocation slip to grain-boundary slide. The present results give the plastic-deformation mechanism and mechanical properties evolution of single-phase HEA processed by HPT at room temperature. (C) 2015 Elsevier B.V. All rights reserved.
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