Abstract Strengthening mechanisms in CNT/metal composites are significant guidelines on composites design. However, the strengthening mechanisms at high temperatures have few been reported. In this work, the evolution of four common strengthening mechanisms in CNT/metal composites, including load transfer strengthening, grain refinement strengthening, enhanced dislocation density strengthening and Orowan strengthening, with temperature was investigated by our developed theoretical models. Then by considering those temperature dependent strengthening mechanisms, a temperature dependent yield strength model for CNT/metal composites was established. Further, the effects of residual thermal stress and quicker softening of matrix on the temperature dependent yield strength of composites were also taken into account. Good agreement is obtained between the model predictions and available experimental results. This study contributes a simple method to predict the yield strength for CNT/metal composites over a wide range of temperatures. In addition, the contribution of each strengthening mechanism to the yield strength of composites at different temperatures was extensively discussed. Some useful suggestions for the design of new CNT/metal composites with high yield strength at elevated temperatures were provided.

中文翻译：

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碳纳米管/金属复合材料的温度相关强化机制和屈服强度

摘要 碳纳米管/金属复合材料的强化机制是复合材料设计的重要指南。然而，在高温下的强化机制鲜有报道。在这项工作中，我们开发的理论模型研究了 CNT/金属复合材料中四种常见的强化机制，包括载荷转移强化、晶粒细化强化、增强的位错密度强化和 Orowan 强化，随温度的演变。然后通过考虑这些温度相关的强化机制，建立了碳纳米管/金属复合材料的温度相关屈服强度模型。此外，还考虑了残余热应力和基体快速软化对复合材料随温度变化的屈服强度的影响。在模型预测和可用实验结果之间获得了良好的一致性。这项研究提供了一种简单的方法来预测 CNT/金属复合材料在很宽的温度范围内的屈服强度。此外，还广泛讨论了每种强化机制对不同温度下复合材料屈服强度的贡献。为设计在高温下具有高屈服强度的新型 CNT/金属复合材料提供了一些有用的建议。