Microstructural evolution of AA7075 powder as feedstock material for cold spray deposition
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F26%3A0199864" target="_blank" >RIV/00216305:26210/26:0199864 - isvavai.cz</a>
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0032591025005571" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0032591025005571</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.powtec.2025.121162" target="_blank" >10.1016/j.powtec.2025.121162</a>
Alternative languages
Result language
angličtina
Original language name
Microstructural evolution of AA7075 powder as feedstock material for cold spray deposition
Original language description
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.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20401 - Chemical engineering (plants, products)
Result continuities
Project
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Continuities
S - Specificky vyzkum na vysokych skolach
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
POWDER TECHNOLOGY
ISSN
0032-5910
e-ISSN
1873-328X
Volume of the periodical
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Issue of the periodical within the volume
463
Country of publishing house
CH - SWITZERLAND
Number of pages
14
Pages from-to
1-14
UT code for WoS article
001506762800001
EID of the result in the Scopus database
2-s2.0-105006663274