摘要
The insufficient damping capabilities of aluminum alloy under low temperatures(<120℃)were addressed by developing high-damping laminated composites of NiTip/5052Al.This is achieved through the incorporation of varied pre-aging states of NiTi particles into the 5052Al matrix using a rolling composite technique.The aim is to enhance the application scope of aluminum alloy for vibration and noise reduction.The results demonstrated a distinct and integrated interface between the particle layer and the 5052Al alloy,with numerous interparticle interfaces within the particle layer.Increasing the aging temperature of the NiTi particles from 450 to 550℃ shifted the phase transition peaks of the composites to lower temperatures.The damping capacity of the laminated NiTip/5052Al composites notably surpasses that of the 5052Al alloy.At 28 and 66℃,the phase transformation damping peaks of the pre-aged NiTi particle layer reinforced 5052Al matrix composites are 1.93 and 2 times those of the 5052Al alloy at the corresponding temperatures,respectively.The collaborative impact of interparticle interface damping mechanism and the phase transformation damping mechanism of NiTi-reinforced particles significantly amplify the low-temperature damping performance of the laminated NiTip/5052Al composites.
针对铝合金在低温(<120℃)下阻尼性能不足的问题,采用轧制复合技术,在5052Al基体中引入不同预时效状态的NiTi颗粒,制备低温高阻尼NiTip/5052Al层状复合材料,进一步扩大铝合金在减振降噪领域的应用。结果表明,颗粒层与5052Al合金之间存在清晰且结合良好的界面,颗粒层中存在大量的颗粒间界面。将掺入NiTi颗粒的时效温度从450℃提高到550℃,复合材料的相变峰向更低的温度移动。NiTip/5052Al复合材料的阻尼性能明显优于5052Al合金。预时效NiTi颗粒层增强5052Al基复合材料在28℃和66℃时的相变阻尼峰值分别是5052Al合金在相应温度时的1.93倍和2倍。在振动变形过程中,NiTi增强颗粒的相变阻尼机制和颗粒间界面阻尼机制的耦合作用显著增强了NiTip/5052Al复合材料的低温阻尼性能。
基金
National Natural Science Foundation of China (No. 52061011)
Guangxi Natural Science Foundation,China (No. 2022GXNSFAA035574)
Innovation Project of Guangxi Graduate Education,China (No. YCSW2023361)。
