TY - JOUR
T1 - A precipitation-hardened high-entropy alloy with outstanding tensile properties
AU - He, J. Y.
AU - Wang, H.
AU - Huang, H. L.
AU - Xu, X. D.
AU - Chen, M. W.
AU - Wu, Y.
AU - Liu, X. J.
AU - Nieh, T. G.
AU - An, K.
AU - Lu, Z. P.
N1 - Funding Information:
This research was supported by National Natural Science Foundation of China ( 51531001 , 51422101 and 51271212 , 51371003 ), 111 Project (B07003), International S&T Cooperation Program of China ( 2015DFG52600 ) and Program for Changjiang Scholars and Innovative Research Team in University ( IRT_14R05 ). TGN acknowledges the support of US National Science Foundation under Contract DMR-1408722 . The portion of this research at ORNL's Spallation Neutron Source was sponsored by the Scientific User Facilities Division , Office of Basic Energy Sciences, US Department of Energy .
Publisher Copyright:
© 2015 Acta Materialia Inc.All rights reserved.
PY - 2016/1/1
Y1 - 2016/1/1
N2 - 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., L12-Ni3(Ti,Al), 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.
AB - 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., L12-Ni3(Ti,Al), 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.
KW - 3 dimensional atom probe tomography
KW - High-entropy alloys
KW - Mechanical properties
KW - Precipitation hardening
KW - Strengthening mechanisms
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U2 - 10.1016/j.actamat.2015.08.076
DO - 10.1016/j.actamat.2015.08.076
M3 - Article
AN - SCOPUS:84942636708
VL - 102
SP - 187
EP - 196
JO - Acta Materialia
JF - Acta Materialia
SN - 1359-6454
ER -