Abstract
To achieve controllable damping temperature zones in aluminum matrix composites, the NiTip/7075Al composites with controllable phase transformation characteristics were prepared through friction stir processing (FSP) and heat treatment. Aging of NiTi particles led to a downward shift in the phase-transition peak temperature of the composite, accompanied by a sharper peak. During the cooling process, the as-NiTip/7075Al + T6 composites underwent a B2 → R transformation and an R → B19′ transformation. Furthermore, the T6 treatment effectively enhanced the tensile strength of the composites. The damping properties of NiTip/7075Al composites at low-temperatures (<90 °C) were significantly superior to those of FSP-7075Al alloy. The as-NiTip/7075Al + T6 composites exhibited two internal friction peaks during cooling, which were 153 % and 211 % higher, respectively, than those observed in the FSP-7075Al alloy at corresponding temperatures. The damping temperature range of the composites can be effectively controlled through T6 treatment and NiTi particle pre-aging.
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