Abstract
A composite was fabricated by an infiltration process using graphite particulates for damping enhancement phase and a Cu-11.9Al-2.5Mn (wt%) shape memory alloy as the matrix, and the internal friction of the resulting composite was studied. Two internal friction peaks were observed in the quenched specimens during heating at 240℃ and 370℃ respectively, of which only the evolvement and the mechanism of the low-temperature peak were investigated in the present study. It was found that, the peak only appears in the composite; the location of the peak is independent of frequency but its height increases with increasing frequency; the peak rises and shifts towards high temperature as the heating rate is increased; the height increases with increasing volume fraction of the graphite particulates; and it disappears after several thermal cycles. It is demonstrated from these features together with microstructure examinations that the peak results from the interaction between the applied stress and the dislocations in the matrix.
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.
