Simultaneous enhancement of strength and ductility with nano dispersoids in nano and ultrafine grain metals: a brief review

Hu, Yusheng; Yu, Ziyun; Fan, Genlian; Tan, Zhanqiu; Zhou, Jianda; Zhang, Hao; Li, Zhiqiang; Zhang, Di

doi:10.1515/rams-2020-0028

Cited by 19 publications

(5 citation statements)

References 76 publications

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“…Grain-refining strengthening [56] is to improve strength by reducing grain size. Because the external force can be dispersed in more grains when the fine-grained copper is deformed under force, the plastic deformation is relatively uniform and the stress concentration is lower.…”

Section: Ultrafine Grained Copper and Copper Alloysmentioning

confidence: 99%

In-Situ Fabrication, Microstructure and Mechanical Performance of Nano Iron-Rich Precipitate Reinforced Cu and Cu Alloys

Chen

et al. 2022

Metals

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In this paper, the research progress on the strengthening of copper and copper alloy is reviewed. The research shows that traditional strengthening methods are often accompanied by the decrease of plasticity, and there are limitations in size, cost, and other aspects in the process. The in-situ nanoparticle strengthening and plasticizing technology proposed in recent years can avoid the above problems. In this paper, the idea of in-situ nanoparticle strengthening is introduced to realize the simultaneous enhancement of strength and ductility of as-cast pure copper and tin bronze alloys. The effects of in-situ precipitation of iron-rich nanoparticles on the microstructure, and mechanical properties of different copper alloy systems, are systematically elucidated based on the former characterization and mechanical testing results. The results show that the in-situ introduction of iron-rich nanoparticles in the copper systems induces the formation of a nano precipitate-fine grain (NPFG) structure, which greatly improves the strength and ductility of copper alloys. The evolution of size, distribution, number density, morphology evolution in iron-rich nanoparticles, and the formation mechanism of NPFG structure, as well as the mechanism of NPFG strengthening and toughening, are summarized. An industrial-applicable casting process is proposed to prepare bulk NPFG structured copper alloys with complex shape, high strength, and high ductility.

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Section: Ultrafine Grained Copper and Copper Alloysmentioning

confidence: 99%

In-Situ Fabrication, Microstructure and Mechanical Performance of Nano Iron-Rich Precipitate Reinforced Cu and Cu Alloys

Chen

et al. 2022

Metals

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“…This approach is mentioned in this review solely to create the integrity of the review. Despite the fact that this approach has been successfully used to increase plasticity in NC Cu [61] and steel [62], it cannot be applied to UFG and NC aluminum and its alloys due to the high stacking fault energy in aluminum lattice [63]. However, it should be noted that there are few studies where the authors claim to have observed twin structures in some UFG and NC Al-alloys of the Al-Mg system [64,65,66].…”

Section: Introduction Of Nanotwinsmentioning

confidence: 99%

Enhanced Ductility of High-Strength Ultrafine-Grained Aluminum Alloys at Ambient Temperature (Review)

Sadykov¹,

Mavlyutov²,

Orlova³

2022

Rev. Adv. Mater. Technol.

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Bulk nanostructured, or ultrafine-grained metals and alloys structured by severe plastic deformation (SPD) methods usually demonstrate high strength and reduced ductility. The poor ductility is a critical issue which limits their practical applications. Significant efforts were made to improve tensile ductility of the SPD-processed metallic materials while keeping sufficiently high strength. In this paper we present a short overview of the developed approaches for simultaneous improvement of the strength and ductility of Al-based alloys with an emphasis on the recent finding and physical reasons of the plasticity enhancement. The main attention is paid to achieving increased ductility of high strength aluminum alloy at room temperature.

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“…In recent decades, both the ex-situ and in-situ methods have been developed to homogeneously introduce the desirable second-phase dispersoids into different metal matrixes 13 – 15 . The nano dispersoids or nanoprecipitates introduced via the in-situ method are mainly synthesized through thermo-mechanical treatment or chemical reaction 15 . Thus, they generally exhibit good thermodynamic stability, fine size, and uniform distribution in metal matrix 13 .…”

Section: Introductionmentioning

confidence: 99%

Achieving high strength and ductility in ODS-W alloy by employing oxide@W core-shell nanopowder as precursor

Dong

et al. 2021

Nat Commun

134

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With excellent creep resistance, good high-temperature microstructural stability and good irradiation resistance, oxide dispersion strengthened (ODS) alloys are a class of important alloys that are promising for high-temperature applications. However, plagued by a nerve-wracking fact that the oxide particles tend to aggregate at grain boundary of metal matrix, their improvement effect on the mechanical properties of metal matrix tends to be limited. In this work, we employ a unique in-house synthesized oxide@W core-shell nanopowder as precursor to prepare W-based ODS alloy. After low-temperature sintering and high-energy-rate forging, high-density oxide nanoparticles are dispersed homogeneously within W grains in the prepared alloy, accompanying with the intergranular oxide particles completely disappearing. As a result, our prepared alloy achieves a great enhancement of strength and ductility at room temperature. Our strategy using core-shell powder as precursor to prepare high-performance ODS alloy has potential to be applied to other dispersion-strengthened alloy systems.

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Simultaneous enhancement of strength and ductility with nano dispersoids in nano and ultrafine grain metals: a brief review

Cited by 19 publications

References 76 publications

In-Situ Fabrication, Microstructure and Mechanical Performance of Nano Iron-Rich Precipitate Reinforced Cu and Cu Alloys

In-Situ Fabrication, Microstructure and Mechanical Performance of Nano Iron-Rich Precipitate Reinforced Cu and Cu Alloys

Enhanced Ductility of High-Strength Ultrafine-Grained Aluminum Alloys at Ambient Temperature (Review)

Achieving high strength and ductility in ODS-W alloy by employing oxide@W core-shell nanopowder as precursor

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