Microstructure and mechanical properties of the intermetallic alloy Ti-45Al-6(Nb, Mo)-0.2B

V. M. Imaev, R. M. Imaev, T. I. Oleneva, T. G. Khismatullin

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The microstructure and tensile properties of the intermetallic γ-TiAl + α2-Ti3Al alloy Ti-45Al-6(Nb, Mo)-0.2B are studied after various heat and thermomechanical treatments. Its cast state is found to be characterized by a homogeneous, relatively fine-grained structure in the cases of both a model 30-g ingot and a bulk laboratory Φ120 × 180-mm ingot. The cast material subjected to heat treatment with furnace cooling and aging at T = 1100°C exhibits strength properties at T = 20-900°C that are relatively high for cast γ + α2 alloys. Due to the rational choice of the alloy, its thermomechanical treatment is facilitated, a fine-grained structure can easily be formed upon hot deformation, and a superplastic state with elongations in the test-temperature range T = 900-1000°C that are very large for γ + α2 alloys is reached. However, the high contents of niobium and molybdenum in the Ti-45Al-6(Nb, Mo)-0.2B alloy hinder the formation of an equilibrium lamellar structure upon heat treatment, and an increase in the aging temperature to T = 1100°C leads to the development of the α2 → ß(B2) phase transformation, which makes it impossible to reach a high level of the mechanical properties in the temperature range of the potential application of γ + α2 alloys. Our study has revealed that the compositions of the γ + α2 alloys need further optimization of the way of refining the niobium and molybdenum contents. 

LanguageEnglish
Pages641-648
Number of pages8
JournalPhysics of Metals and Metallography
Volume106
Issue number6
DOIs
Publication statusPublished - Dec 2008
Externally publishedYes

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Intermetallics
intermetallics
mechanical properties
Mechanical properties
microstructure
Microstructure
Niobium
thermomechanical treatment
casts
Thermomechanical treatment
heat treatment
Molybdenum
Heat treatment
ingots
Ingots
niobium
molybdenum
Aging of materials
fine structure
Lamellar structures

Keywords

  • microstructures
  • thermomechanical treatments
  • alloys

Cite this

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abstract = "The microstructure and tensile properties of the intermetallic γ-TiAl + α2-Ti3Al alloy Ti-45Al-6(Nb, Mo)-0.2B are studied after various heat and thermomechanical treatments. Its cast state is found to be characterized by a homogeneous, relatively fine-grained structure in the cases of both a model 30-g ingot and a bulk laboratory Φ120 × 180-mm ingot. The cast material subjected to heat treatment with furnace cooling and aging at T = 1100°C exhibits strength properties at T = 20-900°C that are relatively high for cast γ + α2 alloys. Due to the rational choice of the alloy, its thermomechanical treatment is facilitated, a fine-grained structure can easily be formed upon hot deformation, and a superplastic state with elongations in the test-temperature range T = 900-1000°C that are very large for γ + α2 alloys is reached. However, the high contents of niobium and molybdenum in the Ti-45Al-6(Nb, Mo)-0.2B alloy hinder the formation of an equilibrium lamellar structure upon heat treatment, and an increase in the aging temperature to T = 1100°C leads to the development of the α2 → {\ss}(B2) phase transformation, which makes it impossible to reach a high level of the mechanical properties in the temperature range of the potential application of γ + α2 alloys. Our study has revealed that the compositions of the γ + α2 alloys need further optimization of the way of refining the niobium and molybdenum contents. ",
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Microstructure and mechanical properties of the intermetallic alloy Ti-45Al-6(Nb, Mo)-0.2B. / Imaev, V. M.; Imaev, R. M.; Oleneva, T. I.; Khismatullin, T. G.

In: Physics of Metals and Metallography, Vol. 106, No. 6, 12.2008, p. 641-648.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Microstructure and mechanical properties of the intermetallic alloy Ti-45Al-6(Nb, Mo)-0.2B

AU - Imaev, V. M.

AU - Imaev, R. M.

AU - Oleneva, T. I.

AU - Khismatullin, T. G.

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Y1 - 2008/12

N2 - The microstructure and tensile properties of the intermetallic γ-TiAl + α2-Ti3Al alloy Ti-45Al-6(Nb, Mo)-0.2B are studied after various heat and thermomechanical treatments. Its cast state is found to be characterized by a homogeneous, relatively fine-grained structure in the cases of both a model 30-g ingot and a bulk laboratory Φ120 × 180-mm ingot. The cast material subjected to heat treatment with furnace cooling and aging at T = 1100°C exhibits strength properties at T = 20-900°C that are relatively high for cast γ + α2 alloys. Due to the rational choice of the alloy, its thermomechanical treatment is facilitated, a fine-grained structure can easily be formed upon hot deformation, and a superplastic state with elongations in the test-temperature range T = 900-1000°C that are very large for γ + α2 alloys is reached. However, the high contents of niobium and molybdenum in the Ti-45Al-6(Nb, Mo)-0.2B alloy hinder the formation of an equilibrium lamellar structure upon heat treatment, and an increase in the aging temperature to T = 1100°C leads to the development of the α2 → ß(B2) phase transformation, which makes it impossible to reach a high level of the mechanical properties in the temperature range of the potential application of γ + α2 alloys. Our study has revealed that the compositions of the γ + α2 alloys need further optimization of the way of refining the niobium and molybdenum contents. 

AB - The microstructure and tensile properties of the intermetallic γ-TiAl + α2-Ti3Al alloy Ti-45Al-6(Nb, Mo)-0.2B are studied after various heat and thermomechanical treatments. Its cast state is found to be characterized by a homogeneous, relatively fine-grained structure in the cases of both a model 30-g ingot and a bulk laboratory Φ120 × 180-mm ingot. The cast material subjected to heat treatment with furnace cooling and aging at T = 1100°C exhibits strength properties at T = 20-900°C that are relatively high for cast γ + α2 alloys. Due to the rational choice of the alloy, its thermomechanical treatment is facilitated, a fine-grained structure can easily be formed upon hot deformation, and a superplastic state with elongations in the test-temperature range T = 900-1000°C that are very large for γ + α2 alloys is reached. However, the high contents of niobium and molybdenum in the Ti-45Al-6(Nb, Mo)-0.2B alloy hinder the formation of an equilibrium lamellar structure upon heat treatment, and an increase in the aging temperature to T = 1100°C leads to the development of the α2 → ß(B2) phase transformation, which makes it impossible to reach a high level of the mechanical properties in the temperature range of the potential application of γ + α2 alloys. Our study has revealed that the compositions of the γ + α2 alloys need further optimization of the way of refining the niobium and molybdenum contents. 

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