Precipitate Structure Changes during Overaging in an Al-Mg-Si Alloy
Starting from a super saturated solid solution and two different conditions with
β′′ precipitates (T6) an Al-Mg-Si alloy was heat treated at 200◦C and investigated by
hardness measurements. One of the T6 conditions was investigated with transmission
electron microscopy (TEM). The phase transformation to post-β′′ was studied
with TEM and there was found that post-β′′ phases nucleated on the β′′ particles.
After longer overaging times the growths were larger. A simple model was proposed
, and it suggested that the growth of post- β′′ phases was the first steps in the
transformation of β′′, and that the final result was a microstructure consisting only
of post- β′′ particles
Place, publisher, year, edition, pages
Institutt for fysikk , 2012. , 89 p.
ntnudaim:8165, MTFYMA fysikk og matematikk, Teknisk fysikk
IdentifiersURN: urn:nbn:no:ntnu:diva-18908Local ID: ntnudaim:8165OAI: oai:DiVA.org:ntnu-18908DiVA: diva2:566364
Holmestad, Randi, Professor