Mechanical and Fatigue Properties of Diamond-Reinforced Cu and Al Metal Matrix Composites Prepared by Cold Spray

0555684 - ÚFP 2022 RIV US eng J - Journal Article
Kovařík, O. - Čížek, Jan - Yin, S. - Lupoi, R. - Janovská, Michaela - Čech, J. - Čapek, J. - Siegl, J. - Chráska, Tomáš
Mechanical and Fatigue Properties of Diamond-Reinforced Cu and Al Metal Matrix Composites Prepared by Cold Spray.
Journal of Thermal Spray Technology. Roč. 31, 1-2 (2022), s. 217-233. ISSN 1059-9630. E-ISSN 1544-1016
R&D Projects: GA MŠMT EF16_019/0000778; GA ČR(CZ) GA20-12624S
Institutional support: RVO:61389021 ; RVO:61388998
Keywords : cold spray * processing diamond metal matrix composites, mechanical properties * properties * properties, fatigue * properties, fracture
OECD category: Coating and films
Impact factor: 3.1, year: 2022
Method of publishing: Open access
https://link.springer.com/article/10.1007/s11666-022-01321-3

Diamond-reinforced metal matrix composites (DMMC) prepared by cold spray are emerging materials simultaneously featuring outstanding thermal conductivity and wear resistance. In our paper, their mechanical and fatigue properties relevant to perspective engineering applications were investigated using miniature bending specimens. Two different diamond mass concentrations (20 and 50%) embedded in two metal matrices (Al—lighter than diamond, Cu—heavier than diamond) were compared with the respective cold-sprayed pure metals, as well as bulk Al and Cu references. The pure Al, Cu coatings showed properties typical for cold spray deposits, i.e., decreased elastic moduli (50 GPa for Al, 80 GPa for Cu), limited ductility (< 1 × 10−3) and low fracture toughness (3.8 MPa·m0.5 for Al, 5.6 MPa·m0.5 for Cu) when compared to the bulks. Significantly improved properties (strain at fracture, ultimate strength, fatigue crack growth resistance, fracture toughness) were then observed for the produced DMMC. The improvement can be explained by a combination of two factors: changes in the properties of the metallic matrix triggered by the reinforcement particles peening effect and stress redistribution due to the particles presence.
Permanent Link: http://hdl.handle.net/11104/0330146