Vreeland, T., Jr. and Montilla, K. L. and Mutz, A. H. (1997) Shock wave initiation of the Ti5Si3 reaction in elemental powders. Journal of Applied Physics, 82 (6). pp. 2840-2844. ISSN 0021-8979 http://resolver.caltech.edu/CaltechAUTHORS:VREjap97
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Elemental powder mixes were subjected to plane wave shock processing which reduced the initial porosity to essentially zero. Two powder mixes in a 5:3 Ti:Si atomic ratio were used: -325 mesh Ti and Si (<45 mu m), and -100 mesh Ti and Si (<150 mu m) with shock pressures up to 7.3 GPa and shock energies up to 671 J/g. Shock pressures were calculated using hugoniot parameters for porous elemental powder mixtures and shock energies were taken to be the work done by the shock (P Delta V/2). Shock energy thresholds for complete reaction of the elemental powders were found which depend upon powder particle size and the initial porosity of the powder. The threshold energy for the larger powder mix was found to be similar to 8O% larger than that for the smaller powder. A decrease in initial porosity from 0.49 to 0.40 caused an increase in threshold shock energy of about 75% for both powders. At shock energies slightly below the threshold energy, evidence for the reaction of solid Ti and liquid Si was observed in small isolated regions. These regions contained spherical micronodules with the composition of TiSi2 in Si. The results are compared to those of previous studies reported in the literature, and mechanisms for reaction initiation and the observed threshold values are proposed.
|Additional Information:||Copyright © 1997 American Institute of Physics. Received 17 February 1997; accepted 5 June 1997. The authors would like to acknowledge the support for this research provided by the National Science Foundation through Grant No. DMR-9396132.|
|Subject Keywords:||titanium alloys; silicon alloys; powder metallurgy; shock wave effects; porosity|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||16 May 2006|
|Last Modified:||26 Dec 2012 08:52|
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