In-situ study of phase transformations during homogenization of 6060 and 6063 Al alloys

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F19%3A10405887" target="_blank" >RIV/00216208:11320/19:10405887 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=JohuE8ys.M" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=JohuE8ys.M</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jpcs.2018.11.013" target="_blank" >10.1016/j.jpcs.2018.11.013</a>

Jazyk výsledku

angličtina

Název v původním jazyce

In-situ study of phase transformations during homogenization of 6060 and 6063 Al alloys

Popis výsledku v původním jazyce

In as-cast 6xxx aluminium billets beta-Al5FeSi intermetallic phase and coarse Mg2Si particles have negative effects on subsequent processes such as extrusion. To achieve extruded products with a high surface quality the billets are heat-treated by a so-called homogenization before extrusion. During the heat treatment undesired intermetallic particles, i.e. beta-AlFeSi platelets, are transformed to rounded alpha-Al(FeMn)Si intermetallic particles. The transformations occurring during homogenization have up until now only been studied by interrupted experiments giving some insight into the process, but a complete picture of how these phase transformations are coupled to the geometrical changes has not evolved. In the present study transformations in 6060 and 6063 alloys have been observed in-situ by TEM, and several nucleation and growth modes have been identified. Boundary layer diffusion was found to be important for the understanding of how the transformations proceed, and also diffusion on the free surface contributed to higher transformation rates compared to industrial processes due to thin characteristics of TEM samples. Together with an earlier study of 6005 and 6082 alloys the homogenization process for all important industrial 6xxx alloys is now characterised in detail by in-situ monitoring.

Název v anglickém jazyce

In-situ study of phase transformations during homogenization of 6060 and 6063 Al alloys

Popis výsledku anglicky

In as-cast 6xxx aluminium billets beta-Al5FeSi intermetallic phase and coarse Mg2Si particles have negative effects on subsequent processes such as extrusion. To achieve extruded products with a high surface quality the billets are heat-treated by a so-called homogenization before extrusion. During the heat treatment undesired intermetallic particles, i.e. beta-AlFeSi platelets, are transformed to rounded alpha-Al(FeMn)Si intermetallic particles. The transformations occurring during homogenization have up until now only been studied by interrupted experiments giving some insight into the process, but a complete picture of how these phase transformations are coupled to the geometrical changes has not evolved. In the present study transformations in 6060 and 6063 alloys have been observed in-situ by TEM, and several nucleation and growth modes have been identified. Boundary layer diffusion was found to be important for the understanding of how the transformations proceed, and also diffusion on the free surface contributed to higher transformation rates compared to industrial processes due to thin characteristics of TEM samples. Together with an earlier study of 6005 and 6082 alloys the homogenization process for all important industrial 6xxx alloys is now characterised in detail by in-situ monitoring.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Journal of Physics and Chemistry of Solids

ISSN

0022-3697

e-ISSN

—

Svazek periodika

130

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

7

Strana od-do

165-171

Kód UT WoS článku

000467669100020

EID výsledku v databázi Scopus

2-s2.0-85062641742