|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Additive Manufacturing: Nano/Micro-mechanics and Length-scale Phenomena
||Impact of powder interstitial hydrogen on the mechanical properties of tantalum cold sprayed coatings
||Mahsa Amiri, Kliah Soto Leytan, Daniel R. Mumm, Lorenzo Valdevit
|On-Site Speaker (Planned)
Experimental and computational approaches were utilized to understand the influence of interstitial hydrogen in particle deformation, jetting and metallurgical bonding, and mechanical properties of cold-sprayed coatings of tantalum. Micro-tensile and micro-compression samples were extracted from particles of powder-feedstocks with different hydrogen contents and particle sizes, as well as from localized regions of sprayed coatings. SEM and HRTEM were used to analyze the microstructures of the coatings and deformed micro-test samples. The deformation of tantalum with varying H contents was studied via molecular-dynamics simulations, at strain rates representative of those expected during the cold-spray impact. The results suggest that low H contents does not cause embrittlement or significant deterioration of mechanical properties. The different behaviors observed in micro-mechanical tests of the coatings are instead attributed to the quality of bonding at the inter-splat boundaries and differences in the network of defects in the coatings resulting from different particle sizes, oxide nature and thickness.