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Microstructure‐oriented characterisation of the cyclic deformation behaviour of Ti‐6Al‐4V
Author(s) -
Rojek N.,
Smaga M.,
Walther F.,
Eifler D.
Publication year - 2008
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.200700217
Subject(s) - materials science , microstructure , hysteresis , deformation (meteorology) , cyclic stress , composite material , scanning electron microscope , titanium alloy , transmission electron microscopy , amplitude , fracture (geology) , stress (linguistics) , plasticity , strain (injury) , metallurgy , alloy , condensed matter physics , nanotechnology , optics , medicine , linguistics , philosophy , physics
In this paper, the cyclic deformation behaviour of the titanium alloy Ti‐6Al‐4V is characterised in uniaxial stress‐ and total‐strain‐controlled load increase and constant amplitude tests at ambient temperature by means of mechanical stress‐strain hysteresis and temperature measurements. The measured physical values obviously show a pronounced interrelation with the underlying fatigue processes and represent the actual fatigue state. In selected experiments the influence of elevated temperatures on the cyclic deformation behaviour was investigated. Using the plastic strain amplitude and the change of the specimen temperature with the physically based lifetime calculation “PHYBAL” an excellent accordance with experimentally determined lifetimes could be realised. Microstructural changes were evaluated by transmission electron microscopy in defined fatigue states, additionally, the fracture surface was analysed by scanning electron microscopy.