Effects of Y₂W₃O₁₂ particle inclusions and content on damping capacity of Al–12Si composites have been investigated. The Y₂W₃O₁₂, which is a kind of negative thermal expansion material, can generate high local strain in the composites. Thermal expansion testing shows that the coefficient of thermal expansion (CTE) of Y₂W₃O₁₂ has obvious changes between 100 and 200 °C The Y₂W₃O₁₂/Al–12Si composites show damping peaks and display higher damping capacities than the pure Al–12Si alloy. The damping capacities of composites strongly depends on the content of Y₂W₃O₁₂ inclusions. A thermal strain damping model is also established. Based on the model analysis results, there is a significant contribution of thermal strain to the damping capacity in the composites; the change in CTE of Y₂W₃O₁₂ could cause the generation of damping peaks. Moreover, dislocation damping and interfacial damping are also main damping mechanisms in the investigated composites.

研究了Y ₂ W ₃ O ₁₂颗粒夹杂物和含量对Al-12Si复合材料阻尼性能的影响。Y ₂ W ₃ O ₁₂是一种负热膨胀材料，可以在复合材料中产生较高的局部应变。热膨胀测试表明，热膨胀（CTE）系数的Y ₂ w ^ ₃ ö ₁₂具有100至200℃的Y之间明显变化₂ w ^ ₃ Ô ₁₂/ Al-12Si复合材料比纯Al-12Si合金具有更大的阻尼峰和更高的阻尼能力。复合材料的阻尼能力在很大程度上取决于Y ₂ W ₃ O ₁₂夹杂物的含量。还建立了热应变阻尼模型。根据模型分析结果，热应变对复合材料的阻尼能力有重要贡献。Y ₂ W ₃ O _12的CTE变化可能会引起阻尼峰的产生。此外，位错阻尼和界面阻尼也是所研究复合材料的主要阻尼机制。