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4839 |
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Investigation of cold spray adhesion mechanism by EBSD and indentation study of interface microstructure and microhardness of high velocity impacted single particle |
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Paul Profizi* / LaMCoS, INSA Lyon, France /
FRI, Tohoku University, Japan, France Alain Combescure / LaMCoS, France Kazuhiro Ogawa/ FRI, Japan Yuji Ichikawa/ FRI, Japan |
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In the context of the Cold Spray coating process, a new numerical model for the simulation of single particle impact and adhesion is briefly introduced. This model adds cohesive forces at the interface only when an adhesion criterion is locally met. This criterion is first taken as a drop in the local yield stress value, sign of a shear localization which is commonly seen as one of the main mechanisms at the origin of this adhesion phenomenon. To clarify the validity of this approach, a set of experimental observations by EBSD of material deformations and microstructure near the interface of a 1mm particle impacted on a substrate at speeds above and under deposition speed for copper and aluminum is presented. Indentations are also carried out to get the microhardness variation around the interface. |