Cold spray is an effective solid-state process for the fabrication of metal matrix composites where metallic, ceramic, or intermetallic reinforcements are embedded in a metallic matrix. Cold-sprayed metal matrix composites (CS MMCs) enable combining favorable properties of their constituent phases. Combinations of the ductility of metals with the high strength of ceramics or with the creep resistance of intermetallics are two typical examples. Here, we review recent advances in the understanding of the mechanical and tribological behavior of CS MMCs, with particular emphasis on the physical mechanisms and predictive understanding. We start the review with deposition mechanisms, defects, and microstructural features in CS MMCs. We continue the discussion with the mechanical behavior of CS MMCs, including elastic modulus, hardness, strength, ductility, as well as adhesive and cohesive failures. We also explore various aspects of the tribology of CS MMCs, from frictional response to abrasive and erosive wear. We discuss the effect of cold spray parameters and post-spray thermal and mechanical treatments on the microstructure and properties of CS MMCs. We connect experimental findings on the mechanics and tribology of CS MMCs with theoretical frameworks to the extent possible. Finally, we propose several critical unresolved issues in the field as future research directions.

中文翻译：

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冷喷涂金属基复合材料的机械和摩擦学行为综述

冷喷涂是一种有效的固态工艺，用于制造金属基复合材料，其中金属、陶瓷或金属间增强材料嵌入金属基体中。冷喷涂金属基复合材料 (CS MMC) 能够结合其组成相的有利特性。金属的延展性与陶瓷的高强度或金属间化合物的抗蠕变性的结合是两个典型的例子。在这里，我们回顾了对 CS MMC 的机械和摩擦学行为的理解的最新进展，特别强调了物理机制和预测性理解。我们从 CS MMC 中的沉积机制、缺陷和微观结构特征开始审查。我们继续讨论 CS MMC 的机械性能，包括弹性模量、硬度、强度、延展性，以及粘合和内聚破坏。我们还探索了 CS MMC 摩擦学的各个方面，从摩擦响应到磨损和侵蚀磨损。我们讨论了冷喷涂参数和喷涂后热处理和机械处理对 CS MMC 微观结构和性能的影响。我们尽可能将 CS MMC 力学和摩擦学的实验结果与理论框架联系起来。最后，我们提出了该领域几个尚未解决的关键问题作为未来的研究方向。我们尽可能将 CS MMC 力学和摩擦学的实验结果与理论框架联系起来。最后，我们提出了该领域几个尚未解决的关键问题作为未来的研究方向。我们尽可能将 CS MMC 力学和摩擦学的实验结果与理论框架联系起来。最后，我们提出了该领域几个尚未解决的关键问题作为未来的研究方向。