An analysis of heterophase structures of Ti3Al and TiAl intermetallics synthesized by the method of the spherical shock wave action

Шорохов, Е. В.; Greenberg, B. A.; Сударева, С. В.; Антонова, О. В.; Boyarshinova, T. S.; Романов, Е. П.

doi:10.1016/s0921-5093(97)00653-9

Cited by 5 publications

(6 citation statements)

References 5 publications

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“…43 For example, extreme conditions have been known to alter the equilibrium physical structure of single-component materials, resulting in pressure-induced phase transformations in metals (α-ε transition in iron), ceramics (α-quartz to coesite/stishovite transition in silica), and molecular liquids (crystallization of water). 1,7,44,45 This task becomes markedly more difficult for multi-component mixtures, the constituents of which may be susceptible to formation of high-pressure allotropic phases (e.g., Si in silicide forming intermetallic systems).…”

Section: Identifying Reaction Productsmentioning

confidence: 99%

“…The rugged design permits recovery of the powder compacts for post-shock characterization (from Song et al 97 ). Shorokhov and coworkers 43 reported on the synthesis of intermetallics in the Ti+Al system under the action of spherical, converging shock waves. Micrometre-scale (< 63 µm) powders were mixed at Ti:Al atomic ratios of 3:1 (48% TMD) and 1:1 (59% TMD), and loaded into a thin-walled spherical steel capsule, 18 mm in diameter, itself encased within a thick (~3 mm) brass shell.…”

Section: Shock-recovery Experiments and Analysesmentioning

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: Identifying Reaction Productsmentioning

confidence: 99%

Section: Shock-recovery Experiments and Analysesmentioning

confidence: 99%

Shock compression of reactive powder mixtures

Eakins

Thadhani

2009

International Materials Reviews

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“…Microstructural examination 18 revealed that the powder particles had bonded by interparticle melting and resolidification, with the high cooling rates resulting in amorphous regions. Shorokhov et al 19,20 also investigated shock synthesis of titanium aluminides, through the action of a spherical shock. In the TiAl based alloy, they noted the presence of three phases in the shocked material, these being ␥-TiAl, Ti 3 Al, and a third unidentified phase, containing iron from the steel encapsulation.…”

Section: Introductionmentioning

confidence: 99%

The shock Hugoniot of the intermetallic alloy Ti–46.5Al–2Nb–2Cr

Millett

Gray

Bourne

2000

Journal of Applied Physics

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Temperature dependent reflectivity and anisotropic magnetization reversal in magnetically doped quasi-twodimensional charge density wave alloys A 0.01 Nb Se 2 ( A = Cr , Mn , Fe ) J. Appl. Phys. 103, 07D306 (2008); 10.1063/1.2856509Shear strength measurements in the TiAl-based alloy Ti-48Al-2Nb-2Cr-1B during shock loadingPlate impact experiments were conducted on a ␥-titanium aluminide ͑TiAl͒ based ordered intermetallic alloy. Stress measurements were recorded using manganin stress gauges supported on the back of TiAl targets using polymethylmethacrylate windows. The Hugoniot in stress-particle velocity space for this TiAl alloy was deduced using impedance matching techniques. The results in this study are compared to the known Hugoniot data of the common alpha-beta engineering Ti-based alloy Ti-6Al-4V. The results of the current study on the intermetallic alloy TiAl support that TiAl possesses a significantly higher stress for a given particle velocity than the two-phase Ti-6Al-4V alloy.

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“…2 and 23͒ showed that such a change in the slope is associated with ␣phase transition. Although new phases ͑that do not exist in the ordinary phase diagram͒ were observed in postshocked titanium aluminide alloys in the work of Shorokhov et al, 7 no correlations were made to features in the shock wave profiles since no free-surface particle velocity measurements were made. However, in our present experiments, we do not believe that this change in slope is due to phase transitions since the level of shock compression used in the present experiments is much lower than that employed in experiments on Ti-6Al-4V and titanium aluminide alloys.…”

Section: -5mentioning

confidence: 99%

“…In the past, as far as Ti-based aerospace materials are concerned, considerable work has been conducted on understanding the shock response of commercially pure Ti and Ti-6Al-4V alloys. [1][2][3][4][5] Ferreira et al 6 and Shorokov et al 7 studied the dynamic compaction of titanium aluminides by explosively generated shock waves. Gray III ͑Ref.…”

Section: Introductionmentioning

confidence: 99%

Shock response of a gamma titanium aluminide

Shazly

Prakash

2008

Journal of Applied Physics

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TiAl alloys in aerospace and other structural applications require knowledge of their impact behavior for better evaluation and modeling. In the present study plate impact experiments are conducted using a single-stage gas gun to better understand the shock behavior of the recently developed class of gamma titanium aluminide alloys-the Gamma-Met PX. The Gamma-Met PX showed superior shock properties when compared to the conventional titanium aluminide alloys. The spall strength of Gamma-Met PX is 1.8Ϯ 0.09 GPa, which is four to six times higher than those reported for other gamma titanium aluminide alloys. Moreover, it has a Hugoniot elastic limit of 1.88 GPa at a target thickness of 3.86 mm, which drops to 1.15 GPa at target thickness of 15.8 mm. The decay in the elastic precursor is continuous without showing an asymptote to a constant level within the range of target thicknesses studied.

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An analysis of heterophase structures of Ti3Al and TiAl intermetallics synthesized by the method of the spherical shock wave action

Cited by 5 publications

References 5 publications

Shock compression of reactive powder mixtures

Shock compression of reactive powder mixtures

The shock Hugoniot of the intermetallic alloy Ti–46.5Al–2Nb–2Cr

Shock response of a gamma titanium aluminide

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