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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20401 - Chemical engineering (plants, products)

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

POWDER TECHNOLOGY

ISSN

0032-5910

e-ISSN

1873-328X

Svazek periodika

—

Číslo periodika v rámci svazku

463

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

14

Strana od-do

1-14

Kód UT WoS článku

001506762800001

EID výsledku v databázi Scopus

2-s2.0-105006663274