Heterostructure-enabled creep resistance and deformation mechanisms in a new Ni-Co-based high-entropy alloy

A novel Ni-Co-based high-entropy alloy (HEA) featuring a stable FCC + L12 dual-phase structure was developed to address creep embrittlement at intermediate temperature. By creating heterostructures in the present HEA, the yield strength of Ni-Co-based HEA was significantly improved from 1100 MPa to...

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Bibliographic Details
Published in:Materials Research Letters
Main Authors: Jinxiong Hou, Lijun Jing, Boxuan Cao, Yilu Zhao, Zhongkai Ren, Tao Wang, Zhihua Wang, Hyoung Seop Kim, Tao Yang
Format: Article
Language:English
Published: Taylor & Francis Group 2025-10-01
Subjects:
High-entropy alloy
Precipitation strengthening
Heterostructure
Creep
Online Access:https://www.tandfonline.com/doi/10.1080/21663831.2025.2576487
Description
Summary:A novel Ni-Co-based high-entropy alloy (HEA) featuring a stable FCC + L12 dual-phase structure was developed to address creep embrittlement at intermediate temperature. By creating heterostructures in the present HEA, the yield strength of Ni-Co-based HEA was significantly improved from 1100 MPa to 1500 MPa with an acceptable tensile elongation of 10%. Simultaneously, the creep embrittlement can be defeated in their heterogeneous counterparts with a superior low steady creep rate of 0.00044%/h at 725 °C and 630 MPa. Transmission electron microscopy evidence suggests that the anti-phase boundaries (APBs) and superlattice intrinsic stacking faults (SISFs) shear the precipitates during the deformation.
ISSN:2166-3831

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