Oxidation behaviors and mechanical properties of L12-strengthened high-entropy alloys at 700 ℃

Shaofei Liu; Wu Kai; Jinxiong Hou; Yilu Zhao; Qian Li; Chin-hua Yang; Tao Yang; Ji-jung Kai

doi:10.1016/j.corsci.2022.110499

Oxidation behaviors and mechanical properties of L1₂-strengthened high-entropy alloys at 700 ℃

Shaofei Liu, Wu Kai^*, Jinxiong Hou, Yilu Zhao, Qian Li, Chin-hua Yang, Tao Yang^*, Ji-jung Kai^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

36 Citations (Scopus)

Abstract

Oxidation behavior and mechanical properties of two L1₂-strengthened high-entropy superalloys (HESAs), i.e., (Ni₂Co₂FeCr)₉₂Ti₄Al₄ and (Ni₂Co₂FeCr)₉₂Nb₄Al₄, were systematically investigated at 700 ℃. Our results reveal that the oxidation resistance was significantly improved by the replacement of Ti with Nb with slightly optimized mechanical performance. The substitution of Ti by Nb promotes the formation of continuous Cr₂O₃, AlNbO₄, and Al₂O₃ layers, and causes a remarkable improvement in oxidation resistance, thus highlighting the greater potential of Nb-bearing HESAs to function as the elevated-temperature structural materials. The underlying mechanisms for the superior mechanical properties and oxidation resistance of the Nb-bearing HESA were carefully discussed.

Original language	English
Article number	110499
Journal	Corrosion Science
Volume	206
Online published	16 Jul 2022
DOIs	https://doi.org/10.1016/j.corsci.2022.110499
Publication status	Published - Sept 2022

Funding

This research was financially supported by Hong Kong Research Grant Council (RGC) [Grant Nos. CityU 11214820, CityU 11209021, CityU 21205621 and C1017–21G] and the National Natural Science Foundation of China (No. 52101162).

Research Keywords

L1 2-strengthened high -entropy alloy
Oxidation behavior
Mechanical properties
Titanium
Niobium
HIGH-TEMPERATURE OXIDATION
DELTA-PHASE PRECIPITATION
TENSILE PROPERTIES
AIR-OXIDATION
EMBRITTLEMENT
DEFORMATION
NB

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RGC-funded

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10.1016/j.corsci.2022.110499

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title = "Oxidation behaviors and mechanical properties of L12-strengthened high-entropy alloys at 700 ℃",

abstract = "Oxidation behavior and mechanical properties of two L12-strengthened high-entropy superalloys (HESAs), i.e., (Ni2Co2FeCr)92Ti4Al4 and (Ni2Co2FeCr)92Nb4Al4, were systematically investigated at 700 ℃. Our results reveal that the oxidation resistance was significantly improved by the replacement of Ti with Nb with slightly optimized mechanical performance. The substitution of Ti by Nb promotes the formation of continuous Cr2O3, AlNbO4, and Al2O3 layers, and causes a remarkable improvement in oxidation resistance, thus highlighting the greater potential of Nb-bearing HESAs to function as the elevated-temperature structural materials. The underlying mechanisms for the superior mechanical properties and oxidation resistance of the Nb-bearing HESA were carefully discussed.",

keywords = "L1 2-strengthened high -entropy alloy, Oxidation behavior, Mechanical properties, Titanium, Niobium, HIGH-TEMPERATURE OXIDATION, DELTA-PHASE PRECIPITATION, TENSILE PROPERTIES, AIR-OXIDATION, EMBRITTLEMENT, DEFORMATION, NB",

author = "Shaofei Liu and Wu Kai and Jinxiong Hou and Yilu Zhao and Qian Li and Chin-hua Yang and Tao Yang and Ji-jung Kai",

year = "2022",

month = sep,

doi = "10.1016/j.corsci.2022.110499",

language = "English",

volume = "206",

journal = "Corrosion Science",

issn = "0010-938X",

publisher = "Elsevier Ltd.",

}

TY - JOUR

T1 - Oxidation behaviors and mechanical properties of L12-strengthened high-entropy alloys at 700 ℃

AU - Liu, Shaofei

AU - Kai, Wu

AU - Hou, Jinxiong

AU - Zhao, Yilu

AU - Li, Qian

AU - Yang, Chin-hua

AU - Yang, Tao

AU - Kai, Ji-jung

PY - 2022/9

Y1 - 2022/9

N2 - Oxidation behavior and mechanical properties of two L12-strengthened high-entropy superalloys (HESAs), i.e., (Ni2Co2FeCr)92Ti4Al4 and (Ni2Co2FeCr)92Nb4Al4, were systematically investigated at 700 ℃. Our results reveal that the oxidation resistance was significantly improved by the replacement of Ti with Nb with slightly optimized mechanical performance. The substitution of Ti by Nb promotes the formation of continuous Cr2O3, AlNbO4, and Al2O3 layers, and causes a remarkable improvement in oxidation resistance, thus highlighting the greater potential of Nb-bearing HESAs to function as the elevated-temperature structural materials. The underlying mechanisms for the superior mechanical properties and oxidation resistance of the Nb-bearing HESA were carefully discussed.

AB - Oxidation behavior and mechanical properties of two L12-strengthened high-entropy superalloys (HESAs), i.e., (Ni2Co2FeCr)92Ti4Al4 and (Ni2Co2FeCr)92Nb4Al4, were systematically investigated at 700 ℃. Our results reveal that the oxidation resistance was significantly improved by the replacement of Ti with Nb with slightly optimized mechanical performance. The substitution of Ti by Nb promotes the formation of continuous Cr2O3, AlNbO4, and Al2O3 layers, and causes a remarkable improvement in oxidation resistance, thus highlighting the greater potential of Nb-bearing HESAs to function as the elevated-temperature structural materials. The underlying mechanisms for the superior mechanical properties and oxidation resistance of the Nb-bearing HESA were carefully discussed.

KW - L1 2-strengthened high -entropy alloy

KW - Oxidation behavior

KW - Mechanical properties

KW - Titanium

KW - Niobium

KW - HIGH-TEMPERATURE OXIDATION

KW - DELTA-PHASE PRECIPITATION

KW - TENSILE PROPERTIES

KW - AIR-OXIDATION

KW - EMBRITTLEMENT

KW - DEFORMATION

KW - NB

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U2 - 10.1016/j.corsci.2022.110499

DO - 10.1016/j.corsci.2022.110499

M3 - RGC 21 - Publication in refereed journal

SN - 0010-938X

VL - 206

JO - Corrosion Science

JF - Corrosion Science

M1 - 110499

ER -

Oxidation behaviors and mechanical properties of L1₂-strengthened high-entropy alloys at 700 ℃

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Research Keywords

RGC Funding Information

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CRF: Designing Self-healing High Entropy Alloys for Advanced Nuclear Applications

GRF: Enhancing Irradiation Resistance of High Entropy Alloys Through FCC-BCC Eutectic Structure

ECS: Grain-Boundary Toughening Mechanisms and Thermal Resistance of Novel Nanoparticles-Strengthened High-Entropy Alloys with Hetero-Lamellar Grain Structures at Intermediate Temperatures

Cite this

Oxidation behaviors and mechanical properties of L12-strengthened high-entropy alloys at 700 ℃

Abstract

Funding

Research Keywords

RGC Funding Information

Access Output

Other Access Options

Permanent Link

Other Files and Links

Fingerprint

Projects

CRF: Designing Self-healing High Entropy Alloys for Advanced Nuclear Applications

GRF: Enhancing Irradiation Resistance of High Entropy Alloys Through FCC-BCC Eutectic Structure

ECS: Grain-Boundary Toughening Mechanisms and Thermal Resistance of Novel Nanoparticles-Strengthened High-Entropy Alloys with Hetero-Lamellar Grain Structures at Intermediate Temperatures

Cite this

Oxidation behaviors and mechanical properties of L1₂-strengthened high-entropy alloys at 700 ℃