Pressure-assisted reactive synthesis of titanium aluminides from dense 50Al-50Ti elemental powder blends

Paransky, E.; Gutmanas, E.Y.; Готман, И.; Koczak, M. J.

doi:10.1007/bf02651868

Cited by 27 publications

(11 citation statements)

References 17 publications

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“…In this method, a non‐dense reactant compact is placed in a rigid constrained die and thermally exploded under a moderate pressure of 50–200 MPa. TE can be ignited either 1) by using hot die and punches (preheated to 800–1250 °C) or 2) by passing a high density electric current through the cold compact (Figure ).…”

Section: Reactive Forging − Pressure Assisted Thermal Explosion Mode mentioning

confidence: 99%

“…In our earlier papers, dense compacts were prepared employing cold sintering (high pressure consolidation at ambient temperature) to avoid oxidation of compact during heating to ignition temperature. At the same time our experiments with non‐dense (70–80% TD) compacts showed that for both heating regimes the heating rate is so high that practically no oxidation takes place.…”

Section: Reactive Forging − Pressure Assisted Thermal Explosion Mode mentioning

confidence: 99%

“…In many systems, pressure assisted TE in rigid dies can be combined with short distance reactive infiltration (SDI) . The developed SDI approach is based on the presence of a low melting phase (e.g., Al, Mg, Ni–Si, Ni–B, Ti–Ni eutectic) in the reactant blend.…”

Section: Reactive Forging − Pressure Assisted Thermal Explosion Mode mentioning

confidence: 99%

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Reactive Forging − Pressure Assisted Thermal Explosion Mode of SHS for Processing Dense In Situ Composites and Structural Parts: A Review

Готман

Gutmanas

2018

Adv Eng Mater

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Over the last decades, there has been a decisive shift from basic science to applied research that brought about the development of a number of unconventional combustion processes that allow for simultaneous synthesis and consolidation of otherwise difficult-to-process high temperature materials. External pressure application during thermal explosion (TE) mode of self-propagating high-temperature synthesis (SHS) can produce dense products provided the combination temperature and pressure are sufficient for consolidation. In the developed TE-based reactive forging (RF) method, a self-sustained reaction is ignited by rapid heat transfer from press die and rams, and a moderate consolidation pressure is applied when the combustion product still contains a sufficient amount of liquid or very soft phase. Plastic flow of the product results in filling the shape of the die thus producing a near-net-shape part. Reactive forging (RF) is especially efficient in combination with the developed short distance infiltration (SDI) approach based on the presence of a low melting phase component (e.g., Al, Mg, Ti-Ni eutectics) in the non-dense reactant blend that is squeezed into the pores under the applied pressure thereby increasing the interparticle contact area and enhancing exothermic heat release rate. Compared to traditional reactive melt infiltration, SDI has the advantage of the considerably shorter infiltration distances (μm vs. mm-cm). Close temperature monitoring during RF and RF/SDI processing provides a deeper insight into the SHS reaction mechanisms. The "heat sink" action of the pressure die after TE results in rapid cooling of the consolidated products and correspondingly fine microstructures and high mechanical properties. Examples of successful application of the RF/SDI processing of homogeneous and functionally graded in situ composites based on binary (Al 2 O 3 , TiB 2 , TiC, TiN) and ternary (MgAl 2 O 4 , Ti 3 SiC 2 , Ti 3 AlC 2 ) ceramics, as well as intermetallic-ceramic and metal-ceramic interpenetrating phase composites are described. Nanostructuring of reactant blends results in lower SHS ignition temperatures, and thus can be utilized for two-stage ignition of multi-component composite materials and structures with tunable ignition delay. Pressure assisted SHS is a "green," cost-effective, and thus perspective manufacturing route of nearnet-shape structural parts. Examples of successful application of RF and RF-SDI approach to fabrication of ceramic matrix-diamond grinding wheels, light armor tiles and high melting temperature nozzles are presented.

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Section: Reactive Forging − Pressure Assisted Thermal Explosion Mode mentioning

confidence: 99%

Section: Reactive Forging − Pressure Assisted Thermal Explosion Mode mentioning

confidence: 99%

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Reactive Forging − Pressure Assisted Thermal Explosion Mode of SHS for Processing Dense In Situ Composites and Structural Parts: A Review

Готман

Gutmanas

2018

Adv Eng Mater

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“…blended powders of elemental Ti and Al particles (Paransky et al, 1996;Rawers & Wrzesinski, 1992;Yang & Weatherly, 1996;Fang et al, 2005). For instance, hot pressing of a Ti-50Al (atomic %) blended powder at 973 K yielded all the apparent intermetallic phases including Ti 3 Al, TiAl, TiAl 2 and TiAl 3 and with the presence of a large amount of unreacted Ti (Paransky et al, 1996), i.e. the microstructure was highly nonequilibrium.…”

Section: Figurementioning

confidence: 99%

In situsynchrotron high-energy X-ray diffraction analysis on phase transformations in Ti–Al alloys processed by equal-channel angular pressing

Liss

Whitfield

et al. 2009

J Synchrotron Radiat

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Mixtures of 47-Al and 53-Ti powders (atomic %) have been consolidated using back pressure equal-channel angular pressing starting with both raw and ball-milled powders. In situ synchrotron high-energy X-ray diffraction studies are presented with continuous Rietveld analysis obtained upon a heating ramp from 300 K to 1075 K performed after the consolidation process. Initial phase distributions contain all intermetallic compounds of this system except Al, with distribution maxima in the outer regions of the concentrations (alpha-Ti, TiAl(3)). Upon annealing, the phase evolution and lattice parameter changes owing to chemical segregation, which is in favour for the more equilibrated phases such as gamma-TiAl, alpha(2)-Ti(3)Al and TiAl(2), were followed unprecedentedly in detail. An initial delta-TiH(2) content with a phase transition at about 625 K upon heating created an intermediate beta-Ti phase which played an important role in the reaction chain and gradually transformed into the final products.

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“…However, the reaction can be difficult to control and loss of shape can occur due to melting and swelling, resulting in high levels of porosity. Often aluminides formed in this way undergo additional or simultaneous processing steps, for example, by the simultaneous application of pressure [14] to reduce the porosity to acceptable levels. These processes are carried out at moderately high temperatures (800-1200 • C) and result in considerable expense, both due to the applied heat and the costs of the tooling materials.…”

Section: Introductionmentioning

confidence: 99%

Hot extrusion reaction synthesis of nickel, titanium and iron aluminides

Minay

Rawlings

McShane

2004

Journal of Materials Processing Technology

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Pressure-assisted reactive synthesis of titanium aluminides from dense 50Al-50Ti elemental powder blends

Cited by 27 publications

References 17 publications

Reactive Forging − Pressure Assisted Thermal Explosion Mode of SHS for Processing Dense In Situ Composites and Structural Parts: A Review

Reactive Forging − Pressure Assisted Thermal Explosion Mode of SHS for Processing Dense In Situ Composites and Structural Parts: A Review

In situsynchrotron high-energy X-ray diffraction analysis on phase transformations in Ti–Al alloys processed by equal-channel angular pressing

Hot extrusion reaction synthesis of nickel, titanium and iron aluminides

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