Unravelling the deposition mechanism of brittle particles in metal matrix composites fabricated via cold spray additive manufacturing

SCRIPTA MATERIALIA

卷:194

Article

Yin, Shuo¹  Hassani, Mostafa²  Xie, Qingge³  Lupoi, Rocco¹ 

[1] Univ Dublin, Trinity Coll Dublin, Dept Mech Mfg & Biomed Engn, Parsons Bldg, Dublin 2, Ireland

[2] Cornell Univ, Sibley Sch Mech & Aerosp Engn, Ithaca, NY 14853 USA

[3] Univ Sci & Technol Beijing, Collaborat Innovat Ctr Steel Technol, Beijing 100083, Peoples R China

关键词: Cold spray deposition;    In-situ observation;    Bonding mechanism;    Additive manufacturing;    Ceramic particle impact;   

DOI  :  10.1016/j.scriptamat.2020.10.055

来源: Elsevier

【 摘 要 】

Cold spray deposition (CSD) emerged as an additive manufacturing process in recent years. It features the highest efficiency among all metal additive manufacturing processes. In this work, the deposition mechanism of brittle reinforcing particles during the CSD of metal matrix composites (MMCs) was investigated. The rebound and fragmentation of brittle microparticles during deposition were investigated at nanosecond level and with microscale resolution through in-situ observation. For the first time, the velocity that determines the transition from particle rebound to particle fragmentation was identified. Herein, this velocity is defined as fragmentation velocity. The X-ray computed tomography on CSD deposits reveal that most of the diamonds in the deposits were fragments of the original particles and their volume fraction significantly depended on their impact velocities relative to the fragmentation velocity. Based on these findings along with microstructure characterizations, the deposition mechanism of brittle reinforcing particles during the CSD of MMCs is proposed. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd.

【 授权许可】

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