Leap microscopes look at TiAl alloys

Stephan S.A. Gerstl; David N. Seidman; Amy A. Gribb; Thomas F. Kelly

Leap microscopes look at TiAl alloys

Stephan S.A. Gerstl^*, David N. Seidman, Amy A. Gribb, Thomas F. Kelly

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to specialist publication › Article

17 Scopus citations

Abstract

The role of oxygen in the formation of nanoscale features was studied in TiAl alloy using LEAP microscopy. The alloy was annealed at 1250°C (2280°F), followed by quenching and aging at 800°C (1470°F) for 24 hours, to capture the initial stages of carbide growth. LEAP mapping revealed that the oxygen concentration within the carbide precipitate is similar to that of carbon, such that its stoichiometry is Ti₄₈Al₄W₁C₂₃O₂₄. Oxycarbides were also found to exist for the perovskite Ti ₃AlC and hexagonal Ti₂AlC type carbides. Oxygen concentrations were measured to be between 8 and 14 at.%, revealing Ti₃(Al,C,O) and Ti₂Al(C,O) oxycarbides, respectively. These results are consistent with previous findings which show that oxygen partitions strongly to ceramic-type strengthening precipitates.

Original language	English (US)
Pages	31-33
Number of pages	3
Volume	162
No	10
Specialist publication	Advanced Materials and Processes
State	Published - Oct 1 2004

ASJC Scopus subject areas

Materials Science(all)
Mechanics of Materials
Mechanical Engineering

Cite this

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title = "Leap microscopes look at TiAl alloys",

abstract = "The role of oxygen in the formation of nanoscale features was studied in TiAl alloy using LEAP microscopy. The alloy was annealed at 1250°C (2280°F), followed by quenching and aging at 800°C (1470°F) for 24 hours, to capture the initial stages of carbide growth. LEAP mapping revealed that the oxygen concentration within the carbide precipitate is similar to that of carbon, such that its stoichiometry is Ti48Al4W1C23O24. Oxycarbides were also found to exist for the perovskite Ti 3AlC and hexagonal Ti2AlC type carbides. Oxygen concentrations were measured to be between 8 and 14 at.%, revealing Ti3(Al,C,O) and Ti2Al(C,O) oxycarbides, respectively. These results are consistent with previous findings which show that oxygen partitions strongly to ceramic-type strengthening precipitates.",

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AU - Gerstl, Stephan S.A.

AU - Seidman, David N.

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AU - Kelly, Thomas F.

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N2 - The role of oxygen in the formation of nanoscale features was studied in TiAl alloy using LEAP microscopy. The alloy was annealed at 1250°C (2280°F), followed by quenching and aging at 800°C (1470°F) for 24 hours, to capture the initial stages of carbide growth. LEAP mapping revealed that the oxygen concentration within the carbide precipitate is similar to that of carbon, such that its stoichiometry is Ti48Al4W1C23O24. Oxycarbides were also found to exist for the perovskite Ti 3AlC and hexagonal Ti2AlC type carbides. Oxygen concentrations were measured to be between 8 and 14 at.%, revealing Ti3(Al,C,O) and Ti2Al(C,O) oxycarbides, respectively. These results are consistent with previous findings which show that oxygen partitions strongly to ceramic-type strengthening precipitates.

AB - The role of oxygen in the formation of nanoscale features was studied in TiAl alloy using LEAP microscopy. The alloy was annealed at 1250°C (2280°F), followed by quenching and aging at 800°C (1470°F) for 24 hours, to capture the initial stages of carbide growth. LEAP mapping revealed that the oxygen concentration within the carbide precipitate is similar to that of carbon, such that its stoichiometry is Ti48Al4W1C23O24. Oxycarbides were also found to exist for the perovskite Ti 3AlC and hexagonal Ti2AlC type carbides. Oxygen concentrations were measured to be between 8 and 14 at.%, revealing Ti3(Al,C,O) and Ti2Al(C,O) oxycarbides, respectively. These results are consistent with previous findings which show that oxygen partitions strongly to ceramic-type strengthening precipitates.

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Leap microscopes look at TiAl alloys

Abstract

ASJC Scopus subject areas

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