Reactive Ni/Ti nanolaminates

被引:49
作者
Adams, D. P. [1 ,2 ]
Rodriguez, M. A. [1 ]
McDonald, J. P. [1 ]
Bai, M. M. [1 ,2 ]
Jones, E., Jr. [1 ]
Brewer, L. [1 ]
Moore, J. J. [2 ]
机构
[1] Sandia Natl Labs, Albuquerque, NM 87185 USA
[2] Colorado Sch Mines, Golden, CO 80401 USA
基金
美国能源部;
关键词
SELF-PROPAGATING REACTIONS; HIGH-TEMPERATURE SYNTHESIS; THERMAL-EXPLOSION MODE; COMBUSTION SYNTHESIS; MULTILAYER FOILS; POROUS NITI; MECHANISM; ALLOYS; CRYSTALLIZATION; PRESSURE;
D O I
10.1063/1.3253591
中图分类号
O59 [应用物理学];
学科分类号
摘要
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 similar to 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 (T-Ig) similar to 300-400 degrees C for nanolaminates. Ignition temperature was influenced by bilayer thickness with more coarse laminate designs exhibiting increased T-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' NiTi (martensite), hexagonal NiTi2, and B2 NiTi. Single-phase, cubic B2 NiTi generally formed when the initial bilayer thickness was made small. (C) 2009 American Institute of Physics. [doi:10.1063/1.3253591]
引用
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页数:8
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