TY - JOUR

T1 - Strengthening mechanisms in high-entropy alloys

T2 - Perspectives for alloy design

AU - Rivera-Díaz-Del-Castillo, P.E.J.

AU - Fu, H.

PY - 2018/10/14

Y1 - 2018/10/14

N2 - High-entropy alloys (HEAs), originally introduced to the literature due to their ability to stabilize a single phase across large temperature ranges, have recently demonstrated to display multiphase systems undergoing a variety of strengthening mechanisms. Previous reports have focused on solid solution strengthening and precipitation hardening; however, other hardening mechanisms such as twinning and martensite formation have been reported to play a key role in controlling their mechanical behavior. Such deformation mechanisms display significant variations with temperature and strain rate. The present contribution provides an outline of the various hardening mechanisms reported in the literature for HEAs. For each mechanism, a modeling strategy is proposed to describe the associated mechanical behavior. The mechanisms are combined into a single framework to discover new HEAs of improved mechanical behavior. A strategy for HEA design is presented, and the advantages of adopting additive layer manufacturing to improve mechanical behavior are discussed. Copyright © Materials Research Society 2018.

AB - High-entropy alloys (HEAs), originally introduced to the literature due to their ability to stabilize a single phase across large temperature ranges, have recently demonstrated to display multiphase systems undergoing a variety of strengthening mechanisms. Previous reports have focused on solid solution strengthening and precipitation hardening; however, other hardening mechanisms such as twinning and martensite formation have been reported to play a key role in controlling their mechanical behavior. Such deformation mechanisms display significant variations with temperature and strain rate. The present contribution provides an outline of the various hardening mechanisms reported in the literature for HEAs. For each mechanism, a modeling strategy is proposed to describe the associated mechanical behavior. The mechanisms are combined into a single framework to discover new HEAs of improved mechanical behavior. A strategy for HEA design is presented, and the advantages of adopting additive layer manufacturing to improve mechanical behavior are discussed. Copyright © Materials Research Society 2018.

KW - microstructure

KW - salloy

KW - strength

KW - Age hardening

KW - Alloying

KW - Entropy

KW - Hardening

KW - Microstructure

KW - Strain rate

KW - Additive layer manufacturing

KW - Deformation mechanism

KW - Hardening mechanism

KW - Martensite Formation

KW - Multi phase systems

KW - Solid solution strengthening

KW - Strengthening mechanisms

KW - Mechanisms

U2 - 10.1557/jmr.2018.328

DO - 10.1557/jmr.2018.328

M3 - Journal article

VL - 33

SP - 2970

EP - 2982

JO - Journal of Materials Research

JF - Journal of Materials Research

SN - 0884-2914

IS - 19

ER -