Effect of Mn and cooling rates on α-, β- and δ-Al–Fe–Si intermetallic phase formation in a secondary Al–Si alloy
Journal article, Peer reviewed
Accepted version
![Thumbnail](/ntnu-xmlui/bitstream/handle/11250/2642966/Effect%2bof%2bMn%2band%2bcooling%2brates%2bon%2b%25CE%25B1-%252C%2b%25CE%25B2-%2band%2b%25CE%25B4-Al%25E2%2580%2593Fe%25E2%2580%2593Si%2bintermetallic%2bphase%2bformation%2bin%2ba%2bsecondary%2bAl%25E2%2580%2593Si%2balloy.pdf.jpg?sequence=6&isAllowed=y)
Åpne
Permanent lenke
http://hdl.handle.net/11250/2642966Utgivelsesdato
2019Metadata
Vis full innførselSamlinger
- Institutt for fysikk [2698]
- Institutt for materialteknologi [2549]
- Publikasjoner fra CRIStin - NTNU [38294]
Sammendrag
Secondary Al–Si alloys Al7.1Si(1.5-xMn)Fe(xMn)Mn with xMn = 0, 0.3, 0.375, 0.6, 0.75 at.% have been solidified with different cooling rates: 0.05 K/s, 1.4 K/s, 11.4 K/s and 200 K/s. In the ternary alloy with xMn = 0 at.%, formation of the primary αh phase is suppressed upon higher cooling rates at the cost of formation of plate-shaped β and δ phase particles. In the quaternary alloys, with increasing Mn content, αc-phase particles with Chinese-script morphology form and replace the plate-shaped intermetallic particles. While the αc phase forms at intermediate cooling rates only, plate-shaped particles additionally form at low and high cooling rates. The β phase dominates after solidification with lower cooling rates and the δ phase dominates upon higher cooling rates in the plate-shaped particles. The kinetic effect in terms of solidification rate and the chemical composition effect on the phase selection of Fe-containing intermetallic particles in the alloys along the solidification path have been discussed.