Abstract No.:	7232
Scheduled at:	Friday, May 06, 2022, Hall G1 11:20 AM Cold Gas Spraying III
Title:	Cold spray additive manufacturing of a nano-TiB2/AlSi10Mg composite
Authors:	Gang Ji* / Université de Lille, France Xinliang Xie / ICB UMR 6303, CNRS, Univ. Bourgogne Franche-Comté, UTBM, France Chaoyue Chen/ State Key Laboratory of Advanced Special Steels, School of Materials Science and Engineering, Shanghai University, China Zhe Chen/ State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, China Ahmed Addad/ Univ. Lille, CNRS, INRAE, Centrale Lille, UMR 8207 - UMET - Unité Matériaux et Transformations, France Hanlin Liao/ ICB UMR 6303, CNRS, Univ. Bourgogne Franche-Comté, UTBM, France
Abstract:	Cold spray (CS), as a solid-state deposition technique for surface coating, has recently been exploited as an unconventional additive manufacturing (AM) process to fabricate net-shape components. So far, Al matrix composites (AMCs) fabricated by CSAM have received increased attentions due to their high potentials for aircraft and marine applications. It has been demonstrated that certain mechanical properties (e.g. microhardness, wear performance) of the CS AMCs can be largely improved by properly integrating ceramic reinforcement particles into the Al matrix. However, it is still challenging to obtain AMCs with high tensile performance due to uneven distribution of reinforcement particles, poor interfacial bonding between Al matrix and reinforcement particles and between splats as well as defects (e.g. residual pores) within the composite deposits. In the present work, we proposed a hybrid AM strategy combining gas atomization (involving in-situ reaction), CS and post-friction stir processing (FSP) to produce new AMCs with simultaneously improved tensile strength and ductility. A specially designed AlSi10Mg matrix composite powder reinforced with in-situ formed TiB2 nanoparticles was used as the feedstock for CS. Post-FSP treatment was employed to further tailor the microstructure, remove the defects, and improve mechanical property of the CS TiB2/AlSi10Mg composites. Our tensile tests showed balanced ultimate tensile strength (365 MPa) and ductility (elongation of 16.0 %) achieved in the final composite part. The strengthening mechanisms related to the microstructure evolution were discussed in terms of microstructure characterization using X-ray diffraction, scanning and (high-resolution) transmission electron microscopy.

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