Cyclic deformation behavior of high-purity titanium single crystals: Part II. Microstructure and mechanism |
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| Authors: | X Tan H Guo H Gu C Laird N D H Munroe |
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| Affiliation: | (1) the Hemispheric Center for Environmental Technology, Florida International University, 33199 Miami, FL;(2) the Department of Metallurgy and Materials Engineering, Ecole Polytechnique, Montreal, PQ, Canada;(3) Present address: the Research Institute for Strength of Metals, Xi’an Jiaotong University, 710049 Xi’an, People’s Republic of China;(4) the Department of Materials Science and Engineering, University of Pennsylvania, 19104 Philadelphia, PA;(5) the Hemispheric Center for Environmental Technology, Florida International University, USA |
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| Abstract: | Strain-controlled cyclic tests have been conducted on high-purity titanium single crystals with different orientations. The
fatigue mechanisms of the titanium crystals were studied by means of a scanning electron microscope (SEM) and a transmission
electron microscope (TEM). It was found that single slip lines, wavy slip lines, double slip lines, twins, and associated
slip lines occurred in differently oriented single crystals. A new type of fractographic morphology, parallel traces, was
observed. Dislocation patterns and cyclic twins, as well as the mechanical response, were analyzed. The dependence of the
deformation mechanisms on the orientations of the single crystals is discussed. |
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