Abstract
During grain refinement, fatigue strength usually does not increase always simultaneously with tensile strength for a certain material. To optimize the fatigue strength of ultrafine-grained (UFG) materials, systematic studies were carried out on the high-cycle fatigue behaviors of UFG Cu and Cu-Zn alloys. It is found that as the grain size decreases, although the fatigue strength coefficient (σ′f) rises synchronously with tensile strength, the fatigue strength exponent (b) decreases continuously, which suppresses the improvement of fatigue strength. Nevertheless, by proper alloying to increase the planarity of dislocation slip, both the two parameters can be improved simultaneously. The increase of σ′f can be owing to the much refined grain size and that in b should be ascribed to the improved slip reversibility and deformation homogeneity. Therefore, the fatigue strength of the UFG materials can be optimized by coordinating the microstructural approach (grain refinement) and the chemical approach (alloying).
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: 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.
