Measurement of precipitate nucleation times in molten metals by pulsed surface melting

Conference · Sat Jan 01 04:00:00 EST 1983

OSTI ID:5581983

Follstaedt, D M; Picraux, S T; Peercy, P S; Knapp, J A; Wampler, W R

The short melt duration resulting from pulsed laser and electron beam surface melting of ion-implanted metals has been used to measure precipitate nucleation times of compounds within the melt. We have examined the phases present in several alloy systems with TEM and used calculated thermal histories to place limits on the time required for nucleation of the following compounds: AlSb (5 to 25 ns), Al/sub 3/Ni (greater than or equal to 750 ns), Al/sub 3/Ni/sub 2/ (greater than or equal to 950 ns) and AlNi (< 1000 ns), all in molten Al, and TiC (less than or equal to 100 ns) in molten Fe. The compounds observed after our rapid solidification have relatively simple, cubic structures and melt congruently, while those predicted but not observed have more complex structures and decompose peritectically.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5581983
• Report Number(s): SAND-83-1254C; CONF-831174-5; ON: DE84002383
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals &amp; Alloys-- Structure &amp; Phase Studies
ALLOYS
ALUMINIUM
BEAMS
CARBIDES
CARBON COMPOUNDS
ELECTRON BEAMS
ELEMENTS
FLUIDS
INTERMETALLIC COMPOUNDS
ION IMPLANTATION
IRON
IRRADIATION
LEPTON BEAMS
LIQUID METALS
LIQUIDS
MELTING
METALS
NUCLEATION
PARTICLE BEAMS
PHASE TRANSFORMATIONS
PRECIPITATION
PULSED IRRADIATION
SEPARATION PROCESSES
SOLIDIFICATION
TITANIUM CARBIDES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS