About this Research Topic
Additive Manufacturing (AM) technologies allow the production of fully dense metal components taking advantage of melting thin layers of metal powder. AM processes recently gained much interest, not only thanks to the high geometrical freedom but also thanks to the peculiar microstructures and the enhanced mechanical properties it is possible to obtain. Despite this growing interest, up to now, there are only a limited number of commercial alloy systems for AM, i.e. pure titanium and Ti6Al4V alloys, stainless steels, nickel-based superalloys, Al-Si alloys, cobalt-chromium and recently high-entropy alloys. At the same time, developing new alloy compositions is now becoming a key challenge to address in the additive manufacturing field.
The development of new alloys for AM requires first of all the preparation and characterization of feedstock materials, which can be metallic powders or wires with innovative compositions. New strategies based on innovative compositions or mixing or reactions of different elements or alloys should offer the possibility to obtain new materials able to satisfy mechanical and functional requirements of different industrial fields. In addition, researchers on new AM alloys must consider the study of the main process parameters, such as laser power and scanning speed, layer thickness, hatching distance, scanning strategy, working atmosphere and gas composition, in order to obtain dense components. In some cases, it is necessary to define specific thermal treatments for reaching the best mechanical performances of the new alloys. All the process and post-process conditions are able to influence microstructures, phase evolution and mechanical and functional behavior of the AM materials, requiring deep analyses of these features when new compositions are developed.
The aim of the current Research Topic is to cover promising, recent, and novel research trends in the field of the development of new alloys for AM technologies. Areas to be covered in this Research Topic may include, but are not limited to:
- development of new compositions by in-situ or ex-situ approaches describing starting materials, strategies for alloy production and/or formation, compositional and microstructural characterization of the final new alloys
- processing of new alloys or metal matrix composites through AM processes, describing the definition of process parameters and/or post-processing conditions and microstructures and mechanical properties of AM materials based on new compositions
- mechanical and microstructural properties of new alloys processed AM, deeply describing the advanced functional and mechanical behavior of AM materials based on new compositions
- studies related to correlation among AM parameters, microstructures and mechanical properties of new metallic materials
Keywords: Alloys, Additive Manufacturing, Microstructures, Mechanical Properties, Processing, Metallic Materials
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