Abstract
Shock-recovery experiments were performed on Ti-Si, Ti-Al, and Ti-B powder mixtures to produce compacts of reacted and unreacted states to characterize the reaction product microstructure as well as the shock-compressed configuration of unreacted constituents. Microstructural and X-ray diffrac-tion (XRD) peak broadening analyses were performed on unreacted compacts to determine the con-figurational changes occurring during shock compression of powders and to quantify the differences in the deformation response of the reactants in each system. The results of the present work dem-onstrate that the mechanistic processes leading to shock-induced reactions are dominated bydiffer-ences in the shock-compression response of the powder mixture reactants. It was established that the propensity for initiation of shock-induced chemical reaction decreases from Ti-Si to Ti-B to Ti-Al powder mixtures, irrespective of the differences in the thermodynamic characteristics of these sys-tems. The differences in the mechanical properties of the reactants influence the shock-compression response (deformation or fracture and flow behavior) and mixing of reactants, and therefore, the configuration changes prior to initiation of shock-induced chemical reactions.
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T.E. ROYAL formerly Graduate Research Assistant, School of Materials Science and Engineering, Georgia Institute of Technology.
This article is based on a presentation made in the symposium “Dynamic Behavior of Materials,” presented at the 1994 Fall Meeting of TMS/ASM in Rosemont, Illinois, October 3-5, 1994, under the auspices of the TMS-SMD Mechanical Metallurgy Committee and the ASM-MSD Flow and Fracture Committee.
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Royal, T.E., Namjoshi, S. & Thadhani, N.N. Mechanistic processes influencing shock chemistry in powder mixtures of the Ti-Si, Ti-Al, and Ti-B systems. Metall Mater Trans A 27, 1761–1771 (1996). https://doi.org/10.1007/BF02651925
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DOI: https://doi.org/10.1007/BF02651925