Abstract Energy dissipation, usually, mechanical damping and storage modulus of WC-Co coated A356.2 and their composites dispersed with silica rich rice husk ash (RHA) particulates have been studied in this work. All the specimens are coated using HVOF technique with an optimum coating thickness of 100 µm as obtained by MATLAB. The damping and storage moduli have been measured using dynamic mechanical analyzer at three distinct frequencies (0.1, 1 and 10 Hz) over a temperature range of 35 °C to 150 °C. Introspection of these results reveals that the mechanical damping and storage modulus has been improved with the incorporation of RHA and further increases with the increase in the RHA content. Furthermore, coated WC-Co samples demonstrate higher mechanical damping than the base alloy and its composites, however, a loss in the storage modulus has been noticed which is due to the presence of W2C phase. Porosity, hardness and the residual stresses are the mechanisms responsible for the increase in mechanical damping of WC-Co coated Al/RHA composites.

中文翻译：

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WC-Co 涂层 A356.2/RHA 复合材料的能量耗散

摘要 本工作研究了分散在富含二氧化硅的稻壳灰 (RHA) 颗粒中的 WC-Co 涂层 A356.2 及其复合材料的能量耗散、机械阻尼和储能模量。所有样品均使用 HVOF 技术进行涂层，最佳涂层厚度为 100 µm，由 MATLAB 获得。在 35 °C 至 150 °C 的温度范围内，使用动态力学分析仪在三个不同频率（0.1、1 和 10 Hz）下测量了阻尼和储能模量。对这些结果的反省表明，机械阻尼和储能模量随着 RHA 的加入而得到改善，并随着 RHA 含量的增加而进一步增加。此外，涂层 WC-Co 样品表现出比基础合金及其复合材料更高的机械阻尼，然而，已经注意到储能模量的损失，这是由于 W2C 相的存在。孔隙率、硬度和残余应力是增加 WC-Co 涂层 Al/RHA 复合材料机械阻尼的机制。