Abstract
The effect of grain size and deformation temperature on the stabilised dislocation structure was studied in individual grains of fine- and coarse-grained nickel polycrystals after cyclic deformation at room temperature and at 77 K. It has been found that, independent of the grain size and deformation temperature, the dislocation patterns in the individual grains are substantially determined by the axial orientation of the grains. A typical feature of the structure in the coarse-grained material fatigued at room temperature is a fragmentation of the grain dislocation configuration into structure sections with different mesoscopic structure parameters. In fine-grained material after cycling at room temperature and in coarse-grained material cycled at 77 K, no subdivision of the grain structure could be detected. Low-temperature deformation of coarse-grained nickel leads to the formation of a ‘two-phase’ structure, that is characteristically different to the extended wall structure observed in single-slip oriented nickel monocrystals cyclically deformed at 77 K.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.