Deformation Behaviors in Single BCC‐Phase Refractory Multi‐Principal Element Alloys under Dynamic Conditions
Source abstract
Abstract
Abstract The mechanical behavior and microstructural evolution of a BCC‐phase NbTaTiV refractory multi‐principal element alloy (RMPEA) is studied over a wide range of strain rates (10 −3 to 10 3 s −1 ) and temperatures (room temperature to 850 °C). The mechanical property of present RMPEA shows less strain‐rate dependence and strong resistance to softening at high temperatures. Under high strain‐rate loading, the formation of thin type‐I twins is observed, which could lead to an increase in strain‐hardening rates. However, this hardening mechanism competes with adiabatic heating effects, resulting in the deterrence of strain‐hardening behaviors. In contrast, substantial strain‐hardening occurs at cryogenic temperatures due to the formation of twins, which act as stronger barriers to dislocation motion and interact with each other. To further understand the different strain‐hardening behaviors, density functional theory (DFT) calculations predict relatively low stacking fault energies and high twinning stress for the NbTaTiV RMPEA.
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Research context
OpenAlex topics: High Entropy Alloys Studies · Intermetallics and Advanced Alloy Properties · Titanium Alloys Microstructure and Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Materials Engineering Auburn University Auburn AL 36849 USA
Center for Integrated Nanotechnologies MPA Division Los Alamos National Laboratory Los Alamos NM 87545 USA
Department of Materials Science and Engineering The University of Tennessee Knoxville TN 37996‐2100 USA
Department of Electrophysics National Yang Ming Chiao Tung University Hsinchu 30010 Taiwan
Department of Mechanical and Aerospace Engineering University of California San Diego CA 92093 USA
Korea Institute for Rare Metals Korea Institute of Industrial Technology (KITECH) Incheon 21655 Republic of Korea
School of Aerospace and Mechanical Engineering University of Oklahoma Norman OK 73019‐1052 USA
Neutron Scattering Division Oak Ridge National Laboratory Oak Ridge TN 37831 USA
Division of Advanced Materials Engineering Kongju National University Cheonan Chungnam 330‐717 Republic of Korea
Funding
Army Research Office · National Science Foundation · Consejería de Economía y Hacienda · National Research Foundation of Korea · U.S. Department of Energy
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