Reactive Ni/Ti nanolaminates

Journal Article · Sun Nov 01 04:00:00 EST 2009 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3253591· OSTI ID:21361903

Adams, D P; Bai, M M ^[1]; Rodriguez, M A; McDonald, J P; Jones, E Jr; Brewer, L ^[1]; Moore, J J ^[2]

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1. Sandia National Laboratories, Albuquerque, New Mexico, 87185 (United States)
2. Colorado School of Mines, Golden, Colorado, 80401 (United States)

Nickel/titanium nanolaminates fabricated by sputter deposition exhibited rapid, high-temperature synthesis. When heated locally, self-sustained reactions were produced in freestanding Ni/Ti multilayer foils characterized by average propagation speeds between approx0.1 and 1.4 m/s. The speed of a propagating reaction front was affected by total foil thickness and bilayer thickness (layer periodicity). In contrast to previous work with compacted Ni-Ti powders, no preheating of Ni/Ti foils was required to maintain self-propagating reactions. High-temperature synthesis was also stimulated by rapid global heating demonstrating low ignition temperatures (T{sub ig})approx300-400 deg. C for nanolaminates. Ignition temperature was influenced by bilayer thickness with more coarse laminate designs exhibiting increased T{sub ig}. Foils reacted in a vacuum apparatus developed either as single-phase B2 cubic NiTi (austenite) or as a mixed-phase structure that was composed of monoclinic B19{sup '} NiTi (martensite), hexagonal NiTi{sub 2}, and B2 NiTi. Single-phase, cubic B2 NiTi generally formed when the initial bilayer thickness was made small.

• OSTI ID: 21361903
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 9 Vol. 106; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
ALLOYS
AUSTENITE
CARBON ADDITIONS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DEPOSITION
DIMENSIONS
ELEMENTS
FOILS
HEAT TREATMENTS
IGNITION
IRON ALLOYS
LAYERS
MARTENSITE
METALS
MONOCLINIC LATTICES
NANOSTRUCTURES
NICKEL
PERIODICITY
POWDERS
SPUTTERING
SYNTHESIS
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
THICKNESS
TITANIUM
TRANSITION ELEMENT ALLOYS
TRANSITION ELEMENTS
VARIATIONS