Journal
ACTA MATERIALIA
Volume 102, Issue -, Pages 187-196Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2015.08.076
Keywords
High-entropy alloys; Precipitation hardening; Strengthening mechanisms; Mechanical properties; 3 dimensional atom probe tomography
Funding
- National Natural Science Foundation of China [51531001, 51422101, 51271212, 51371003]
- 111 Project [B07003]
- International S&T Cooperation Program of China [2015DFG52600]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT_14R05]
- US National Science Foundation [DMR-1408722]
- Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy
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Recent studies indicated that high-entropy alloys (HEAs) possess unusual structural and thermal features, which could greatly affect dislocation motion and contribute to the mechanical performance, however, a HEA matrix alone is insufficiently strong for engineering applications and other strengthening mechanisms are urgently needed to be incorporated. In this work, we demonstrate the possibility to precipitate nanosized coherent reinforcing phase, i.e., L1(2)-Ni-3(TLA1), in a fcc-FeCoNiCr HEA matrix using minor additions of Ti and Al. Through thermomechanical processing and microstructure controlling, extraordinary balanced tensile properties at room temperature were achieved, which is due to a well combination of various hardening mechanisms, particularly precipitation hardening. The applicability and validity of the conventional strengthening theories are also discussed. The current work is a successful demonstration of using integrated strengthening approaches to manipulate the properties of fcc-HEA systems, and the resulting findings are important not only for understanding the strengthening mechanisms of metallic materials in general, but also for the future development of high-performance HEAs for industrial applications. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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