Shock-Wave Synthesis of Titanium Aluminides

Horie, Y.; Hoy, D.E.P.; Simonsen, I.; Graham, R. A.; Morosin, B.

doi:10.1007/978-1-4613-2207-8_109

Cited by 6 publications

(4 citation statements)

References 2 publications

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“…Nearly identical experiments were performed on mixtures of TizAl (micrometre scale powders, 7 : 3 volumetric ratio, 60%TMD), with shock pressures and bulk temperatures ranging within 5-27 GPa and 150-800uC respectively. 92 Once again, reaction products were localised at the periphery of the recovered compact, identified by microanalysis to be a mixture of Ti 3 Al, Ti 2 Al and TiAl (Fig. 9).…”

Section: Experimental Evidence Of Chemical Reactions Under Shock Load...mentioning

confidence: 97%

“…92 Once again, reaction products were localised at the periphery of the recovered compact, identified by microanalysis to be a mixture of Ti 3 Al, Ti 2 Al, and TiAl (Fig. 9).…”

Section: Shock-recovery Experiments and Analysesmentioning

confidence: 98%

“…33,36,38,39,87,100 On the other hand, those systems that remain inert, NizAl, MozSi and TizAl (shown centre crossed), are far removed from the origin, and are associated with large differences in intrinsic properties. 85,92,103,132 From the distribution of data, it appears that shock induced reaction will be suppressed above impedance and strength differences of y175 and y200% respectively. Based on these limits, a reaction zone can be prescribed through the difference space, indicating where the differences in impedance and strength satisfy the proposed conditions for shock induced reaction at modest pressures, in the regime of the crush strength of the powder mixture systems.…”

Section: Design and Control Of Shock Induced Reactionsmentioning

confidence: 99%

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Shock compression of reactive powder mixtures

Eakins

Thadhani

2009

International Materials Reviews

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The shock-compression of reactive powder mixtures can yield varied chemical behaviour with occurrence of mechanochemical reactions in the time-scale of the high-pressure state, or thermochemical reactions in the time-scale of temperature equilibration, or simply the creation of densepacked highly reactive state of material. The principal challenge has been to understand the processes that distinguish between mechanochemical (shock-induced) and thermochemical (shock-assisted) reactions, which has broad implications for the synthesis of novel metastable or non-equilibrium materials, or the design of highly configurable next-generation energetic materials. In this paper, the process of shock-compression in reactive powder mixtures and the associated role of various intrinsic and extrinsic characteristics of reactants in the triggering of ultra-fast "shock-induced" chemical reactions are discussed. Experimental techniques employing time-resolved diagnostics, and results, that identify the occurrence of shock-induced reactions are reviewed. Conceptual and numerical models used to describe the heterogeneous nature of such reactions through mesoscopic details of shock-compression are presented. Finally, a discussion of the application of recent results for the design of reactive material systems with controlled reaction initiation and energy release characteristics is provided.

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Section: Experimental Evidence Of Chemical Reactions Under Shock Load...mentioning

confidence: 97%

“…92 Once again, reaction products were localised at the periphery of the recovered compact, identified by microanalysis to be a mixture of Ti 3 Al, Ti 2 Al, and TiAl (Fig. 9).…”

Section: Shock-recovery Experiments and Analysesmentioning

confidence: 98%

Section: Design and Control Of Shock Induced Reactionsmentioning

confidence: 99%

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Shock compression of reactive powder mixtures

Eakins

Thadhani

2009

International Materials Reviews

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“…Attempts at conducting shock synthesis of TiAl in flat capsules using coarse powders of the components at a pressure of 5-27 GPa have shown that the reaction proceeds in a small central part of the capsule and the product is a mixture of phases containing primarily TiAl 3 and Ti and an insignificant amount of Ti 3 Al, Ti 2 Al, and the γ-phase of TiAl [9]. In the same setup of shock experiments, a mixture of γ-TiAl and Ti 3 Al is formed in narrow zones of intense plastic flows [10].…”

Section: Introductionmentioning

confidence: 99%

Shock synthesis and microstructure of Ti-Al alloy

Gur'ev

Gordopolov

Zaripov

et al. 2009

Combust Explos Shock Waves

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High-temperature solid-state synthesis was for the first time performed with the use of explosion energy combined with shock compression. The composition and structure of the alloy obtained by synthesis of the stoichiometric Ti + Al mixture using this method are studied. The microstructure of the double-phase (γ + α 2 ) intermetallic alloy differs from the structure of the alloys produced by hot explosive pressing at close temperatures of preheating and shock pressure and from the structures produced by powder metallurgy methods. A considerable increase in the yield of the γ phase is obtained.

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