Precipitation in nanostructured alloys: A brief review

Ma, Kun; Zheng, Yufeng; Dasari, Sriswaroop; Zhang, Dalong; Fraser, Hamish L.; Banerjee, Rajarshi

doi:10.1557/s43577-021-00066-8

Cited by 15 publications

(12 citation statements)

References 60 publications

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“…Thermal behaviors of those nanocomposites are unknown. Age-hardened Al alloys with nanoprecipitation often suffer from microstructural instability at temperatures below 200 °C [1,2], but a composition modification strategy may be promising to inhibit the nanoprecipitation coarsening [113].…”

Section: Wwwmrsorg/jmrmentioning

confidence: 99%

Achieving strong and stable nanocrystalline Al alloys through compositional design

Wang

et al. 2021

Journal of Materials Research

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Al alloys often suffer from low mechanical strength and lack high-temperature microstructural and mechanical robustness. A series of binary and ternary nanocrystalline (NC) Al transition metal alloys with supersaturated solid solution and columnar nanograins have been recently developed by using magnetron sputtering, manifesting a new realm of mechanical properties and thermal stability. Distinct solutes cause evident differences in the phase transformations and efficiencies for grain refinement and crystalline-to-amorphous transition. Certain sputtered Al-TM alloys have shown room-temperature mechanical strengths greater than 2 GPa and outstanding thermal stability up to 400 °C. In addition, the NC Al alloys show mechanical anisotropy and tension–compression asymmetry, revealed by micromechanical tests. Through the process encapsulating various compositionally distinct systems, we attempt to illuminate the solute effects on grain refinement and properties and more importantly, tentatively unravel the design criteria for high-strength and yet thermally stable NC Al alloys. Graphic Abstract

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Section: Wwwmrsorg/jmrmentioning

confidence: 99%

Achieving strong and stable nanocrystalline Al alloys through compositional design

Wang

et al. 2021

Journal of Materials Research

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“…In situ coherent nanocomposites (ISCNCs), − GP-zones, − and superalloys − are important classes of multiphase solid materials. Coherency between the phases in these materials is their most important feature ensuring their outstanding properties.…”

Section: Introductionmentioning

confidence: 99%

Interfacial Energy of Strained Coherent Interfaces and a New Design Rule To Select Phase Combinations for In Situ Coherent Nanocomposites

Kaptay

2023

Langmuir

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Nanocomposites show the best performance when their reinforcing phase precipitates in situ from a matrix upon heat treatment and when coherency between the matrix and the reinforcing phase is preserved even upon coarsening the precipitated particles. In this paper, first a new equation is derived for the interfacial energy of strained coherent interfaces. From here, a new design rule is derived in a form of a new dimensionless number to select phase combinations for in situ coherent nanocomposites (ISCNCs). This is calculated from the molar volume mismatch between the two phases, their elastic constants, and the modeled interfacial energy between them. When this dimensionless number is smaller than a critical value, ISCNCs are formed. The critical value of this dimensionless number is found here using experimental data for the Ni−Al/Ni 3 Al superalloy. The validity of the new design rule was confirmed on the Al−Li/Al 3 Li system. An algorithm is suggested to apply the new design rule. Our new design rule can be simplified to more easily available initial parameters: if the matrix and the precipitate have the same cubic crystal structure the precipitate is expected to form ISCNCs with that matrix if their standard molar volumes differ less than by about 2%.

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“…However, when the grain size is decreased below nano-level, the strengthening is usually accompanied by a drop in ductility; as the grain size decreases, the strength increases significantly, while the fracture elongation sharply decreases and even exhibits brittle behavior [ 7 , 8 , 9 , 10 ]. The reason is that dislocation accumulation becomes impossible in such small grains, and dislocations emit from one grain-boundary segment and then disappear at another, leading to an extremely low work-hardening rate [ 11 , 12 , 13 ]. Indeed, most nanostructured metals have been found to exhibit zero work hardening [ 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Nanostructured Metals with an Excellent Synergy of Strength and Ductility: A Review

Chen

2022

Materials

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Nanocrystalline metals developed based on fine grain strengthening always have an excellent strength, but are accompanied by a drop in ductility. In the past 20 years, substantial efforts have been dedicated to design new microstructures and develop the corresponding processing technologies in order to solve this problem. In this article, the novel nanostructures designed for simultaneously achieving high strength and high ductility developed in recent years, including bimodal grain size distribution nanostructure, nanotwinned structure, hierarchical nanotwinned structure, gradient nanostructure, and supra-nano-dual-phase nanostructure, are reviewed. Based on a comprehensive understanding of the simultaneously strengthening and toughening mechanisms, the microstructures and corresponding processing techniques are mainly discussed, and the related prospects that may be emphasized in the future are proposed.

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Precipitation in nanostructured alloys: A brief review

Cited by 15 publications

References 60 publications

Achieving strong and stable nanocrystalline Al alloys through compositional design

Achieving strong and stable nanocrystalline Al alloys through compositional design

Interfacial Energy of Strained Coherent Interfaces and a New Design Rule To Select Phase Combinations for In Situ Coherent Nanocomposites

Nanostructured Metals with an Excellent Synergy of Strength and Ductility: A Review

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