High damping capacity of AlSi10Mg-NiTi lattice structure interpenetrating phase composites prepared by additive manufacturing and pressureless infiltration

Abstract

In order to improve the damping capacity of aluminum matrix composites (AMCs) and overcome the mutual exclusive of strengthening and damping capacity, a new strategy that combined additive manufacturing (AM) and vacuum infiltration process to prepare AMC was developed. The prepared AMC was AlSi10Mg-NiTi lattice structure interpenetrating phase composite (IPC), and its damping capacity was increased by more than 94% and the compressive strength was increased by 100%, compared with those of AlSi10Mg. The mechanism of IPC’s high damping capacity is mainly the improvement of interface damping with the combined effects of grain boundary damping and stacking faults (SFs). The mechanism of the effectively improved compressive strength is the continuous three-dimensional interpenetrating phase structure with good interface and the strengthening of SFs and nano-scale Ti7Al5Si12 grains. The present findings may provide an alternative and effective way to obtain multifunctional structure-damping materials.