Abstract

In this work, in situ oxidation and particle-dispersed methods are successfully used to prepare novel oxide/Mg composites with ultra-high damping capacity starting from pure Mg as the matrix. Successful incorporation of the MgO particles into the Mg matrix is experimentally demonstrated, and the role of the oxide in enhancing the damping capacities of the composites is examined in detail. The increased damping capacity of the composites with respect to the pure magnesium is attributed to an increased dislocation density and the introduction of interface damping. In the temperature-dependent damping tests, two damping peaks P₁ and P₂ were found. The P₁ peak is considered to be related to the interaction between dislocations and impurity atoms or vacancies. The P₂ peak is considered to be caused by the grain boundaries sliding.

Graphic Abstract

中文翻译：

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原位合成氧化物增强镁基复合材料的超高阻尼能力

摘要

在这项工作中，原位氧化和颗粒分散方法已成功用于制备以纯Mg为基质的具有超高阻尼能力的新型氧化物/ Mg复合材料。实验证明了将MgO颗粒成功掺入Mg基质中，并详细研究了氧化物在增强复合材料阻尼能力方面的作用。复合材料相对于纯镁的阻尼能力的提高归因于位错密度的增加和界面阻尼的引入。在与温度有关的阻尼测试中，发现了两个阻尼峰P ₁和P ₂。P ₁认为该峰与位错和杂质原子或空位之间的相互作用有关。P ₂峰被认为是由晶界滑动引起的。

图形摘要