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Reactive Ni/Ti nanolaminates

J. Appl. Phys. 106, 093505 (2009); doi:10.1063/1.3253591

Published 6 November 2009

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D. P. Adams,1,2 M. A. Rodriguez,1 J. P. McDonald,1 M. M. Bai,1,2 E. Jones, Jr.,1 L. Brewer,1 and J. J. Moore2
1Sandia National Laboratories, Albuquerque, New Mexico, 87185, USA
2Colorado School of Mines, Golden, Colorado, 80401, USA
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 ~0.1 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 (Tig)~300–400 °C for nanolaminates. Ignition temperature was influenced by bilayer thickness with more coarse laminate designs exhibiting increased Tig. 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[prime] NiTi (martensite), hexagonal NiTi2, and B2 NiTi. Single-phase, cubic B2 NiTi generally formed when the initial bilayer thickness was made small. ©2009 American Institute of Physics
History: Received 18 May 2009; accepted 26 September 2009; published 6 November 2009
Permalink: http://link.aip.org/link/?JAPIAU/106/093505/1
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KEYWORDS and PACS

Keywords
PACS
  • 81.16.-c
    Methods of nanofabrication and processing
  • 61.46.-w
    Structure of nanoscale materials
  • 81.40.Gh
    Other heat and thermomechanical treatments
  • 68.65.Ac
    Multilayers (structure and nonelectronic properties)
  • 81.15.Cd
    Deposition by sputtering
  • 81.07.-b
    Nanoscale materials and structures: fabrication and characterization
  • YEAR: 2009

PUBLICATION DATA

ISSN:
0021-8979 (print)   1089-7550 (online)
Publisher:
AIP is a member of CrossRef AIP

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