Abstract
A special high-purity titanium single crystal was prepared to study the effect of loading mode on deformation microstructure. Six rectangularly sectioned specimens were cut from the same single crystal. The loading axis of the specimens was parallel to the C-axis of the crystal, and the wide surface was parallel to the prism plane {10 1 &}, with the narrow surface {1 2 10}. Mechanical tests were conducted within the chamber of a scanning electron microscope JSM35C using a specially designed apparatus with closed-loop computer control. Five loading modes were used: monotonic tension, tension-tension fatigue, and tension-compression fatigue with three different stress amplitudes. The surface appearance of the specimens was registered with SEM periodically, and the cyclic twins as well as persistent slip bands were identified using trace analysis technique. The substructures of the tested specimens were examined with a transmission electron microscope on foils cut from the specimens parallel to the wide surface. The dislocation structures of specimens tested in different modes were observed, and the slip systems and twinning modes for each case are discussed.
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