NDLI: Investigation of primary and secondary creep deformation mechanism of TiAl

Content Provider	Springer Nature Link
Author	Nam, Soo W. Cho, H. S. Hwang, Sun Keun Kim, Nack J.
Copyright Year	2000
Abstract	Creep deformation behaviors in lamellar TiAl alloys have been investigated. As in the case with metals, the normal primary creep stage was observed. As creep strain increased within the primary regime, dislocation density decreased, and creep activation energy increased from 300 kJ/mol, the activation energy of the self-diffusion of Ti in TiAl, to about 380 kJ/mol, that of steady state creep deformation. During primary creep deformation of lamellar TiAl, as the initial dislocation density decreased, the α$_{2}$ -phase was found to transform to a γ-phase, generating new dislocations which contributed to the creep deformation. In other words, this phase transformation is the source of the dislocation generation for continuous creep deformation. Therefore, we suggest that phase transformation is the rate controlling processes having an activation energy of about 400 kJ/mol, which is higher than that of self-diffusion. A small amount of prestrain was found to be responsible for the reduction of initial dislocation density. In addition, this prestrained specimen showed significantly reduced primary creep strain, and the creep activation energy in the primary stage was measured to be about 380 kJ/mol. These results clearly confirm the suggested creep deformation mechanism of lamellar TiAl alloys.
Starting Page	287
Ending Page	292
Page Count	6
File Format	PDF
ISSN	15989623
Journal	Metals and Materials
Volume Number	6
Issue Number	4
Language	English
Publisher	The Korean Institute of Metals and Materials
Publisher Date	2000-01-01
Publisher Place	Seoul
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	TiAl creep lamellar phase transformation Metallic Materials Operating Procedures, Materials Treatment Magnetism, Magnetic Materials Engineering Thermodynamics, Heat and Mass Transfer Characterization and Evaluation of Materials Continuum Mechanics and Mechanics of Materials
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Mechanics of Materials Metals and Alloys Condensed Matter Physics

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