Off-stoichiometry-guided design of high-strength chemically complex intermetallic-based alloys with outstanding ductility

Bo Xiao; Jixun Zhang; Shaofei Liu; Yilu Zhao; Lianyong Xu; C.T. Liu; Tao Yang

doi:10.1016/j.jmst.2023.02.033

Off-stoichiometry-guided design of high-strength chemically complex intermetallic-based alloys with outstanding ductility

Bo Xiao
, Jixun Zhang
, Shaofei Liu
, Yilu Zhao
, Lianyong Xu
, C.T. Liu
, Tao Yang^*

^*Corresponding author for this work

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

24 Citations (Scopus)

Abstract

Chemically complex intermetallic alloys (CCIMAs) have gained particular interest because of their attractive physical and mechanical properties. However, the CCIMAs based on the strict alloying stoichiometry often show serious brittleness with very low ductility at ambient temperature, which seriously hinders their practical use in engineering applications. Here we demonstrate an off-stoichiometry strategy to achieve large tensile plasticity (-30%) together with an ultrahigh tensile strength (-1.4 GPa) in a novel Co_39.3Ni_39.6Al_13.8Ti_3.1Ta_2.8Nb_1.4 (at.%) CCIMA system. Such an ultrahigh strength is primarily ascribed to the high anti-phase boundary energy via multiple alloying additions (i.e., Ti, Ta, and Nb). Simultaneously, the nanoscale disordered phases at grain boundaries (GBs) can efficiently enhance dislocation mobilities and plastic deformation compatibility, thus resulting in a large ductility. The off-stoichiometry strategy provides an effective avenue for the innovation of ultra-strong yet ductile multicomponent intermetallic-based alloys.

© 2023 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

Original language	English
Pages (from-to)	28-33
Number of pages	6
Journal	Journal of Materials Science and Technology
Volume	160
Online published	6 Apr 2023
DOIs	https://doi.org/10.1016/j.jmst.2023.02.033
Publication status	Published - 10 Oct 2023

Funding

The authors from the City University of Hong Kong acknowledge the financial support from the National Natural Science Foundation of China (Grant Nos. 52101151 and 52222112), the Hong Kong Research Grant Council (RGC) (Grant Nos. CityU 21205621, 11214820, 11209021, and C1017–21 G), and the Guangdong Basic and Applied Basic Research Foundation (Grant No. 2020A1515110647). Y.L.Z. is grateful for financial support from the National Natural Science Foundation of China (No. 52101135) and the Shenzhen Science and Technology Program (Grant No. RCBS20210609103202012).

Research Keywords

Anti-phase boundary energy
Chemically complex intermetallic alloys
Mechanical behavior
Microstructure
Nanoscale disordered phase
Off-stoichiometry

RGC Funding Information

RGC-funded

Access Output

10.1016/j.jmst.2023.02.033

Other Access Options

Check CityUHK Library

Permanent Link

Right click to copy link

Cite this

@article{66ed74d8ec524ee3a7f5ce695e2f1b96,

title = "Off-stoichiometry-guided design of high-strength chemically complex intermetallic-based alloys with outstanding ductility",

abstract = "Chemically complex intermetallic alloys (CCIMAs) have gained particular interest because of their attractive physical and mechanical properties. However, the CCIMAs based on the strict alloying stoichiometry often show serious brittleness with very low ductility at ambient temperature, which seriously hinders their practical use in engineering applications. Here we demonstrate an off-stoichiometry strategy to achieve large tensile plasticity (-30\%) together with an ultrahigh tensile strength (-1.4 GPa) in a novel Co39.3Ni39.6Al13.8Ti3.1Ta2.8Nb1.4 (at.\%) CCIMA system. Such an ultrahigh strength is primarily ascribed to the high anti-phase boundary energy via multiple alloying additions (i.e., Ti, Ta, and Nb). Simultaneously, the nanoscale disordered phases at grain boundaries (GBs) can efficiently enhance dislocation mobilities and plastic deformation compatibility, thus resulting in a large ductility. The off-stoichiometry strategy provides an effective avenue for the innovation of ultra-strong yet ductile multicomponent intermetallic-based alloys. {\textcopyright} 2023 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science \& Technology.",

keywords = "Anti-phase boundary energy, Chemically complex intermetallic alloys, Mechanical behavior, Microstructure, Nanoscale disordered phase, Off-stoichiometry",

author = "Bo Xiao and Jixun Zhang and Shaofei Liu and Yilu Zhao and Lianyong Xu and C.T. Liu and Tao Yang",

year = "2023",

month = oct,

day = "10",

doi = "10.1016/j.jmst.2023.02.033",

language = "English",

volume = "160",

pages = "28--33",

journal = "Journal of Materials Science and Technology",

issn = "1005-0302",

publisher = "Elsevier Ltd.",

}

TY - JOUR

T1 - Off-stoichiometry-guided design of high-strength chemically complex intermetallic-based alloys with outstanding ductility

AU - Xiao, Bo

AU - Zhang, Jixun

AU - Liu, Shaofei

AU - Zhao, Yilu

AU - Xu, Lianyong

AU - Liu, C.T.

AU - Yang, Tao

PY - 2023/10/10

Y1 - 2023/10/10

N2 - Chemically complex intermetallic alloys (CCIMAs) have gained particular interest because of their attractive physical and mechanical properties. However, the CCIMAs based on the strict alloying stoichiometry often show serious brittleness with very low ductility at ambient temperature, which seriously hinders their practical use in engineering applications. Here we demonstrate an off-stoichiometry strategy to achieve large tensile plasticity (-30%) together with an ultrahigh tensile strength (-1.4 GPa) in a novel Co39.3Ni39.6Al13.8Ti3.1Ta2.8Nb1.4 (at.%) CCIMA system. Such an ultrahigh strength is primarily ascribed to the high anti-phase boundary energy via multiple alloying additions (i.e., Ti, Ta, and Nb). Simultaneously, the nanoscale disordered phases at grain boundaries (GBs) can efficiently enhance dislocation mobilities and plastic deformation compatibility, thus resulting in a large ductility. The off-stoichiometry strategy provides an effective avenue for the innovation of ultra-strong yet ductile multicomponent intermetallic-based alloys. © 2023 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

AB - Chemically complex intermetallic alloys (CCIMAs) have gained particular interest because of their attractive physical and mechanical properties. However, the CCIMAs based on the strict alloying stoichiometry often show serious brittleness with very low ductility at ambient temperature, which seriously hinders their practical use in engineering applications. Here we demonstrate an off-stoichiometry strategy to achieve large tensile plasticity (-30%) together with an ultrahigh tensile strength (-1.4 GPa) in a novel Co39.3Ni39.6Al13.8Ti3.1Ta2.8Nb1.4 (at.%) CCIMA system. Such an ultrahigh strength is primarily ascribed to the high anti-phase boundary energy via multiple alloying additions (i.e., Ti, Ta, and Nb). Simultaneously, the nanoscale disordered phases at grain boundaries (GBs) can efficiently enhance dislocation mobilities and plastic deformation compatibility, thus resulting in a large ductility. The off-stoichiometry strategy provides an effective avenue for the innovation of ultra-strong yet ductile multicomponent intermetallic-based alloys. © 2023 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

KW - Anti-phase boundary energy

KW - Chemically complex intermetallic alloys

KW - Mechanical behavior

KW - Microstructure

KW - Nanoscale disordered phase

KW - Off-stoichiometry

UR - https://www.scopus.com/pages/publications/85153210105

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85153210105&origin=recordpage

U2 - 10.1016/j.jmst.2023.02.033

DO - 10.1016/j.jmst.2023.02.033

M3 - RGC 21 - Publication in refereed journal

SN - 1005-0302

VL - 160

SP - 28

EP - 33

JO - Journal of Materials Science and Technology

JF - Journal of Materials Science and Technology

ER -

Off-stoichiometry-guided design of high-strength chemically complex intermetallic-based alloys with outstanding ductility

Abstract

Funding

Research Keywords

RGC Funding Information

Access Output

Other Access Options

Permanent Link

Other Files and Links

Fingerprint

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

Off-stoichiometry-guided design of high-strength chemically complex intermetallic-based alloys with outstanding ductility

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