PHASE FORMATION IN TI–AL–C SYSTEM DURING SHS
https://doi.org/10.17073/1997-308X-2017-4-11-18
Abstract
The phase formation of Ti–Al–C powder mixtures with compositions close to the composition of the MAX phases in self-propagating high-temperature synthesis (SHS) was investigated using time resolved X-ray diffraction. It is found that material formation during combustion in air under low heat removal rates is a staged process. At the first stage, the dominant is the reaction of titanium carbide formation providing major heat release and combustion front propagation. As a result, TiC crystals surrounded by the Ti–Al melt are formed. Behind the combustion front titanium carbide dissolves in the surrounding melt and then the Ti2AlC ternary compound is crystallized. TiC formation is not observed with the synthesis in helium providing high heat removal rates. The first phase emerging on the diffraction field is Ti2AlC. The TiC life cycle of 5–10 s for air-synthesized mixtures is significantly reduced for helium processes and does not exceed 1 s. SHS reaction in helium yielded a Ti2AlC-based composite containing less than 20 wt.% of TiAl, and 2 wt.% of TiC. The material structure is characterized by laminated Ti2AlC grains surrounded by the TiAl matrix. The microhardness of synthesized materials was 4,0–4,5 GPa that corresponds to that of the Ti2AlC phase. Ti2AlC grains synthesized in helium are smaller than in air. Laminated MAX-phase grain sizes grow up to 8–15 μm in length and 2–5 μm in width at slow air cooling. The Ti2AlC grain size in helium is lower – up to 8 μm in length and 1 μm in width.
About the Authors
D. Yu. Kovalev
Institute of structural macrokinetics and materials science RAS
Russian Federation
Russian Federation
Cand. Sci. (Tech.), head of X-Ray investigation Laboratory.
142432, Moscow region, Chernogolovka, Academician Osipyan str., 8
O. A. Averichev
Institute of structural macrokinetics and materials science RAS
Russian Federation
Russian Federation
Engineer-researcher, Laboratory of plastic deformation.
142432, Moscow region, Chernogolovka, Academician Osipyan str., 8
M. A. Luginina
Institute of structural macrokinetics and materials science RAS
Russian Federation
Russian Federation
Postgraduate student, X-Ray investigation Laboratory.
142432, Moscow region, Chernogolovka, Academician Osipyan str., 8
P. M. Bazhin
Institute of structural macrokinetics and materials science RAS
Russian Federation
Russian Federation
Cand. Sci. (Tech.), senior researcher, Laboratory of plastic deformation.
142432, Moscow region, Chernogolovka, Academician Osipyan str., 8
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Review
For citations:
Kovalev D.Yu., Averichev O.A., Luginina M.A., Bazhin P.M. PHASE FORMATION IN TI–AL–C SYSTEM DURING SHS. Powder Metallurgy аnd Functional Coatings (Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional'nye Pokrytiya). 2017;(4):11-18. (In Russ.) https://doi.org/10.17073/1997-308X-2017-4-11-18
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