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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 8    No. 2    June 1998

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STRAIN INDUCED STRUCTURE TRANSITION IN HOT DEFORMED γ+α DUALPHASE TITANIUM ALUMINIDE
Chen Guoliang and Wang Jinguo

State Key Laboratoryfor Advanced Metals and Materials, Department of Materials Science and Engineering, University of Science and Technology Beijing,Beijing100083, P. R. China

Abstract:Strain induced structure transition (SIST) during hot deformation in TiAl alloy was investigated by high-resolution transmission electron microscopy(TEM). Various non-equilibrium asymmetrical twin boundaries with a large number of ledges were found. Special non-equilibrium tilt and asymmetricalγ/αinterfaces were also illustrated. The normal crystal relation betweenγandαcan be changed. The 1/3[111] Frank partial dislocations often appear at these non-equilibrium interfaces. It was also reported that the strain induced phase transitions, includingγ→α,α→γandγ→9Rstructure, commonly occur during hot deformation; the strain induced phase transitions are closely related to interface structure. The dislocation reactions and mechanisms for SIST were discussed.

 

Key words: TiAl alloy strain induced structure transition phase transformation interfacial structure

ISSN 1672-7029
CN 43-1423/U

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