Characterization of TiAl-Be Alloys Produced by Electric Current Activated Sintering

• Authors: N. Ergin , O. Ozdemir
• Languages of publication: EN

Abstracts

EN

In this study, TiAl-Be intermetallic alloys were produced by electric current-activated sintering (ECAS) method in open air under the uniaxial pressure of 200 MPa at a current of 1100-1200 A, applied for 2 minutes. Aluminum powder with 15 μm size (99%), titanium powder with less than 45 μm size (99.5%) and beryllium powder with size less than 44 μm size (99%) were used in order to produce the samples. The elemental powders were mixed in the stoichiometric ratio of 1:1, corresponding to molar proportion of TiAl intermetallic phases, and then the mixed powders were synthesized. While three phases were found in the TiAl samples after the microstructural examination, multi-phases were observed in the TiAl-5 wt.% Be samples. XRD studies revealed that the TiAl intermetallic alloys include TiAl, Ti₃Al and TiAl₃ phases. In addition to these three phases, Be₂Ti phase was also found in the TiAl-5 wt.% Be alloys. The relative densities of the TiAl and TiAl-5 wt.% Be samples, measured according to Archimedes' principle, were approximately 96.4% and 94.5%. Micro-hardness of TiAl and TiAl-5 wt.% Be samples was approximately 426± 34 and 478± 62 HV_{0.1}, respectively.

Keywords

EN

81.05.Bx; 81.20.Ev; 81.40.Cd

Discipline

• 81.40.Cd: Solid solution hardening, precipitation hardening, and dispersion hardening; aging(see also 64.75.Nx Phase separation and segregation in solid solutions)
• 81.20.Ev: Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation
• 81.05.Bx: Metals, semimetals, and alloys

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2015
• Volume: 127
• Issue: 4
• Pages: 1103-1105

Dates

published

2015-04

Contributors

author

N. Ergin

• Sakarya University, Technology Faculty, Department of Metallurgy and Materials Engineering, 54187 Esentepe Campus, Sakarya, Turkey

author

O. Ozdemir

• Sakarya University, Technology Faculty, Department of Metallurgy and Materials Engineering, 54187 Esentepe Campus, Sakarya, Turkey

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Identifiers

DOI

10.12693/APhysPolA.127.1103