Mechanistic processes influencing shock chemistry in powder mixtures of the Ti-Si, Ti-Al, and Ti-B systems
- Georgia Inst. of Tech., Atlanta, GA (United States). School of Materials Science and Engineering
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 diffraction (XRD) peak broadening analyses were performed on unreacted compacts to determine the configurational 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 demonstrate that the mechanistic processes leading to shock-induced reactions are dominated by differences 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 systems. 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.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 282227
- Journal Information:
- Metallurgical Transactions, A, Journal Name: Metallurgical Transactions, A Journal Issue: 7 Vol. 27; ISSN MTTABN; ISSN 0360-2133
- Country of Publication:
- United States
- Language:
- English
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