Interstitial-driven local chemical order enables ultrastrong face-centered cubic multicomponent alloys

He, Zhufeng; Guo, Yanxin; Sun, Linhua; Yan, Haile; Guan, Xianjun; Jiang, Shuang; Shen, Y.F.; Chen, Huaican; Zhao, Xiaoli; Li, Zhi Ming; Jia, Nan

doi:10.1016/j.actamat.2022.118495

Cited by 32 publications

(2 citation statements)

References 81 publications

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“…Certain HEAs/MEAs strengthened with A 3 B-type Ni 3 Al L1 2 and AB-type NiAl B2 ordered nanoparticles exhibit excellent strengthductility combinations (10)(11)(12)(13)(14). However, most precipitates resulting from disorder-to-order transition, such as D0 22 , κ, and η, often lead to a substantial sacrifice of tensile ductility and, in some instances, brittleness (15)(16)(17)(18)(19). This is mainly attributed to the fact that long-range ordered (LRO) phases have lower crystal symmetry and stronger atomic bonding compared to their disordered counterparts.…”

Section: Introductionmentioning

confidence: 99%

Ultrastrong and ductile medium-entropy alloys via hierarchical ordering

Gu,

Zhao,

et al. 2024

Sci. Adv.

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Long-range ordered phases in most high-entropy and medium-entropy alloys (HEAs/MEAs) exhibit poor ductility, stemming from their brittle nature of complex crystal structure with specific bonding state. Here, we propose a design strategy to severalfold strengthen a single-phase face-centered cubic (fcc) Ni 2 CoFeV MEA by introducing trigonal κ and cubic L1 2 intermetallic phases via hierarchical ordering. The tri-phase MEA has an ultrahigh tensile strength exceeding 1.6 GPa and an outstanding ductility of 30% at room temperature, which surpasses the strength-ductility synergy of most reported HEAs/MEAs. The simultaneous activation of unusual dislocation multiple slip and stacking faults (SFs) in the κ phase, along with nano-SF networks, Lomer-Cottrell locks, and high-density dislocations in the coupled L1 2 and fcc phases, contributes to enhanced strain hardening and excellent ductility. This work offers a promising prototype to design super-strong and ductile structural materials by harnessing the hierarchical ordered phases.

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Section: Introductionmentioning

confidence: 99%

Ultrastrong and ductile medium-entropy alloys via hierarchical ordering

Gu,

Zhao,

et al. 2024

Sci. Adv.

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“…He et al achieved significant interstitial solid solution strengthening by employing heavy N-doping and reducing the content of expensive Ni and Co. The organization possesses profuse fine laths and a minor fraction of submicronsized recrystallized grains with nano nitrides [3]. Therefore, the development of nickelsaving austenitic stainless steel has the significance of resource saving, cost reduction, broadening application areas, and environmental friendliness, which are important for the stainless steel industry and sustainable development.…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous Microstructure and Tensile Properties of an Austenitic Stainless Steel

Chen,

Wang,

et al. 2024

Metals

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Stainless steel (SS) exhibits excellent ductility; however, its low strength hinders its practical applications. To achieve good synergy between strength and ductility, a heterogeneous structure was introduced into a newly developed nitrogen-alloyed low-nickel austenitic steel, QN1803. The received QN1803 was cold-rolled and annealed at 993 K for different durations, and the microstructural evolution and tensile mechanical properties were investigated. The yield strength (1130 MPa) of the QN1803 annealed at a temperature of 993 K for 15 min was approximately three times higher than that of the as-received sample (314 MPa). The short annealing time of 15 min yielded a heterogeneous structure with grain size distributions ranging from nanoscale to micron-scale. The annealed QN1803 exhibited typical dislocation cells and dislocation walls caused by slipping after cold rolling. During annealing, a step-like lamellar structure is formed. The high yield strength was obtained from the large number of twins and hard ultrafine grains. The good ductility is due to the large number of dislocations generated in the soft grains and the GNDs around the heterogeneous interfaces. Additionally, the lamella structure of the material also contributes to improved ductility to a certain degree. The aim of this paper is to develop new materials with both high yield strength and excellent toughness based on more economical materials cost.

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Strategies for Achieving Strength–Ductility Synergy in Face‐Centered Cubic High‐ and Medium‐Entropy Alloys

et al. 2023

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High‐ and medium‐entropy alloys (HEAs/MEAs), also called as multicomponent alloys, are a new class of materials that break through the traditional alloy design concept based on single principal element. However, they do not break away from the magic spell of strength–ductility trade‐off. Therefore, designing HEAs/MEAs with both high strength and high ductility still remains a great challenge nowadays. This article provides a review on the recent progress in mechanical properties of face‐centered cubic (FCC) HEAs/MEAs. First, several traditional strengthening strategies are briefly reviewed, focusing on the strengthening mechanisms and the optimized mechanical properties. Subsequently, various novel strategies for achieving strength–ductility synergy in HEAs/MEAs are summarized, which include lowering the stacking fault energy, regulating the short‐range order, promoting transformation‐induced plasticity, and constructing heterogeneous microstructures. The basic ideas and related underlying mechanisms from these strategies are discussed. Finally, the current challenges and the future outlooks are emphasized and addressed systematically. In brief, the present review is expected to provide a useful guide for the design of HEAs/MEAs with superior mechanical properties.

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Interstitial-driven local chemical order enables ultrastrong face-centered cubic multicomponent alloys

Cited by 32 publications

References 81 publications

Ultrastrong and ductile medium-entropy alloys via hierarchical ordering

Ultrastrong and ductile medium-entropy alloys via hierarchical ordering

Heterogeneous Microstructure and Tensile Properties of an Austenitic Stainless Steel

Strategies for Achieving Strength–Ductility Synergy in Face‐Centered Cubic High‐ and Medium‐Entropy Alloys

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