Detail publikačního výsledku

Microstructural evolution of AA7075 powder as feedstock material for cold spray deposition

JUDAS, J.; TEBIB, M.; SENNOUR, M.; DELLORO, F.; ZAPLETAL, J.

Originální název

Microstructural evolution of AA7075 powder as feedstock material for cold spray deposition

Anglický název

Microstructural evolution of AA7075 powder as feedstock material for cold spray deposition

Druh

Článek WoS

Originální abstrakt

In this investigation, the effects of three different heat treatments on the microstructural evolution of gasatomized AA7075 powder were carefully studied. Advanced electron microscopy techniques, in combination with differential scanning calorimetry (DSC) and X-ray diffraction (XRD), were employed to identify crystallographic features and precipitates under each heat treatment condition. The as-atomized powder exhibited a dendritic-cellular structure with pronounced microsegregation along cell boundaries, indicating a highly nonequilibrium solidification state. High-resolution TEM (HRTEM) revealed the presence of metastable precipitates (GP zones) within the alloy matrix, which is responsible for the elevated hardness of the as-received powder. Strengthening precipitates were formed due to both rapid cooling during atomization and prolonged natural aging during powder storage. Annealing treatments led to transformations of metastable precipitates into coarse phases and promoted dissolution of the cellular network, resulting in substantial powder softening. Additionally, the precipitation of thermally stable Cr-rich phases was found to inhibit grain coarsening at higher temperatures through grain boundary pinning. The present work suggests that the microstructure and mechanical properties of AA7075 powder can be effectively tailored via suitable heat treatment strategies, which may enhance powder deformability and improve its performance as a possible feedstock material for Cold Spray technology.

Anglický abstrakt

In this investigation, the effects of three different heat treatments on the microstructural evolution of gasatomized AA7075 powder were carefully studied. Advanced electron microscopy techniques, in combination with differential scanning calorimetry (DSC) and X-ray diffraction (XRD), were employed to identify crystallographic features and precipitates under each heat treatment condition. The as-atomized powder exhibited a dendritic-cellular structure with pronounced microsegregation along cell boundaries, indicating a highly nonequilibrium solidification state. High-resolution TEM (HRTEM) revealed the presence of metastable precipitates (GP zones) within the alloy matrix, which is responsible for the elevated hardness of the as-received powder. Strengthening precipitates were formed due to both rapid cooling during atomization and prolonged natural aging during powder storage. Annealing treatments led to transformations of metastable precipitates into coarse phases and promoted dissolution of the cellular network, resulting in substantial powder softening. Additionally, the precipitation of thermally stable Cr-rich phases was found to inhibit grain coarsening at higher temperatures through grain boundary pinning. The present work suggests that the microstructure and mechanical properties of AA7075 powder can be effectively tailored via suitable heat treatment strategies, which may enhance powder deformability and improve its performance as a possible feedstock material for Cold Spray technology.

Klíčová slova

Aluminum alloy 7075, Heat treatment, Powder metallurgy, Precipitates, Cold spray

Klíčová slova v angličtině

Aluminum alloy 7075, Heat treatment, Powder metallurgy, Precipitates, Cold spray

Autoři

JUDAS, J.; TEBIB, M.; SENNOUR, M.; DELLORO, F.; ZAPLETAL, J.

Rok RIV

2026

Vydáno

01.09.2025

Periodikum

POWDER TECHNOLOGY

Číslo

463

Stát

Švýcarská konfederace

Strany od

1

Strany do

14

Strany počet

14

URL

https://www.sciencedirect.com/science/article/pii/S0032591025005571

BibTex

@article{BUT199864,
  author="Jakub {Judas} and  {} and  {} and  {} and Josef {Zapletal}",
  title="Microstructural evolution of AA7075 powder as feedstock material for cold spray deposition",
  journal="POWDER TECHNOLOGY",
  year="2025",
  number="463",
  pages="1--14",
  doi="10.1016/j.powtec.2025.121162",
  issn="0032-5910",
  url="https://www.sciencedirect.com/science/article/pii/S0032591025005571"
}