|About this Abstract
||Materials Science & Technology 2012
||Coatings for Corrosion and Wear Resistance Applications
||Computational and Experimental Investigation of Cold Spray Morphology
||Seyed Ali Alavian, Andrew Hulton, Baran Yildrim, Sinan Muftu, Teiichi Ando, Andrew Gouldstone
|On-Site Speaker (Planned)
High-velocity sub-mm particle impact is becoming a viable method for additive processing of materials, often referred to as cold or kinetic spray. For several material systems, this technique produces nominally high density (> 99%) thick layers with low residual stress and mechanical properties within 50% of bulk as-deposited. Computational models of high-velocity impact have been employed extensively to examine the key parameters in this process, and results for morphology of single particles have shown reasonable agreement with experimental observations of particles encrusted in substrates. In this study, we extended models to three- and hundred- particle impacts, to examine the origin of different particle morphologies in a coating. These models were compared with electron microscopy observations of flattened, highly distorted and fractured copper particles. Among other aspects including timing, particle velocity and cohesive strength, heat transfer at interfaces was found to play a key role in resulting impact behavior and morphology.
||Definite: A CD-only volume