NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
studies of the crystallization process of aluminum-silicon alloys using a high temperature microscopeIt is shown that primary silicon crystals grow polyhedral in super-eutectic AlSi melts and that phosphorus additives to the melt confirm the strong seeding capacity. Primary silicon exhibits strong dendritic seeding effects in eutectic silicon phases of various silicon alloys, whereas primary aluminum does not possess this capacity. Sodium addition also produces a dendritic silicon network growth in the interior of the sample that is attributed to the slower silicon diffusion velocity during cooling.
Document ID
19850026959
Document Type
Thesis/Dissertation
Authors
Justi, S.
(NASA Headquarters Washington, DC United States)
Date Acquired
September 5, 2013
Publication Date
September 1, 1985
Subject Category
METALLIC MATERIALS
Report/Patent Number
NAS 1.15:77869
NASA-TM-77869
Funding Number(s)
CONTRACT_GRANT: NASW-4004
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Available Downloads

NameType 19850026959.pdf STI