High damping capacity after precipitation in some commercial aluminum alloys

Lightweight NiTi shape memory alloy based composites with high damping capacity and high strength

“…Usually, traditional damping materials, for example, polymers, rubbers and their composites, damping metallic materials and their composites, etc., do not possess high damping capacity and high mechanical property simultaneously, that is, a material with high damping capacity often exhibits low mechanical strength and vice versa, especially under cyclic and impact loads. Hence, there is a strong demand to develop novel damping materials that can couple high damping capacity and good mechanical properties [1][2][3][4][5].…”

Damping properties on age hardening of Al–7Si–0.3Mg alloy during T6 treatment

“…As the concentration of weak pinning point is increased, the distance between pinning points is decreased, and this requires an increase of internal stress which is necessary to overcome the line tension force of dislocation and to sweep out the pinning point. Also, the dislocation damping is also concerned to the dislocation mobility, which it is depend upon the number and source of pinning point, temperature, diffusivity of pinning sources [4,8].…”

“…the dislocation damping and interfacial damping mechanism [4][5][6][7][8][9][10]. Since the interfacial damping is intimately concerned to the absorbing ability of interface E-mail address: choongdo.lee@gmdat.com.…”

“…and grain boundary to thermal gradient or mechanical strain formed in internal structure, it has been frequently proposed as dominant mechanism on MMC [4,5] and RS-PM [6,7] that have a remarkable microstructure characteristics of interface and grain boundary with comparison to conventional microstructure. Otherwise, the dislocation damping behavior that is based on Granato-Lücke theory has been regarded as a dominant damping mechanism of fine grain-sized and conventional aluminum alloys [8][9][10]. And, it is very well known that the damping behavior is fundamentally close related to dislocation movement and interaction between dislocation and pinning point, and that the damping capacity depends sensitively upon the dislocation density and spacing between weak or strong pinning points [8][9][10][11][12][13].…”

“…Otherwise, the dislocation damping behavior that is based on Granato-Lücke theory has been regarded as a dominant damping mechanism of fine grain-sized and conventional aluminum alloys [8][9][10]. And, it is very well known that the damping behavior is fundamentally close related to dislocation movement and interaction between dislocation and pinning point, and that the damping capacity depends sensitively upon the dislocation density and spacing between weak or strong pinning points [8][9][10][11][12][13]. This means that there is intimate relationship between mechanical property and damping capacity on the viewpoint of microstructure change and/or transformation.…”