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Article Dans Une Revue Nature Materials Année : 2023

Highly stable coherent nanoprecipitates via diffusion-dominated solute uptake and interstitial ordering

Hang Xue
Chong Yang
Peng Zhang
  • Fonction : Auteur
Bin Chen
  • Fonction : Auteur
Fuzhu Liu
  • Fonction : Auteur
Jianjun Bian
  • Fonction : Auteur
Gang Liu
Jun Sun

Résumé

Lightweight design strategies and advanced energy applications call for highstrength Al alloys that can serve at 300-400 °C temperature range. However, the present commercial high-strength Al alloys are limited to low-temperature applications < ~150 °C, because the antagonism between high thermal stability (preferentially associated with slowdiffusing solutes) and large volume fraction (mostly derived from high-solubility and fastdiffusing solutes) innate to coherent nanoprecipitates remains unsolved. Here we demonstrate an interstitial solute stabilizing strategy to produce highly-stable coherent nanoprecipitates (termed V phase) in Sc-added Al-Cu-Mg-Ag alloys that have a strong coarsening-resistance up to ~ 400 ºC and simultaneously a volume fraction of ~ 1.8 vol.%. The assembling of slowdiffusing Sc and fast-diffusing Cu atoms into coherent V is triggered by a coherent ledgeaided in-situ phase transformation from early-formed Cu-rich  nanoprecipitates, with diffusion-dominated Sc uptake and self-organization into interstitially ordering. Stable V nanoprecipitates, with an inherited high density, enable the Al alloys to reach an unprecedent creep resistance as well as exceptional tensile strength (~ 100 MPa) at 400 ºC. We envisage that the ledge-mediated interaction between slow-and fast-diffusing atoms may pave the way for the stabilization of coherent nanoprecipitates toward advanced 400 ºC-level light alloys, which could be readily adapted to large-scale industrial production.
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Dates et versions

hal-04246192 , version 1 (17-10-2023)

Identifiants

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Hang Xue, Chong Yang, Frédéric De Geuser, Peng Zhang, Jinyu Zhang, et al.. Highly stable coherent nanoprecipitates via diffusion-dominated solute uptake and interstitial ordering. Nature Materials, 2023, 22 (4), pp.434-441. ⟨10.1038/s41563-022-01420-0⟩. ⟨hal-04246192⟩
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