Surface Inoculation of Aluminium Powders for Additive Manufacturing guided by Differential Fast Scanning Calorimetry
Additive manufacturing meets light construction materials and made new ways of weight reduction possible as well as for mobility solutions as moving parts in machines, to mention two of a large number of applications. The meaningful handling with energy sources and corresponding the saving of resources is a global concern and more topical than ever before. The Chair of Materials Science (LWK) at Paderborn University provides a contribution to this within the Special Priority Program (SPP) 2122, New materials for laser-based additive manufacturing, funded by the German Research Foundation (DFG).
Following aspects are projected by LWK and its partners:
The surface inoculation of powder particles of the aluminium alloy EN AW-7075 with nanoparticles (TiC, TiB2) shall lead to grain refinement and enables the processing of said and equivalent alloys by laser beam melting (LBM). The scalability of the inoculation process is carried out at the Paderborn University. A specially developed method will be used for this purpose, which would make a potential industrial application possible.
After material modification, an improvement of processability by means of LBM due to achieving the greatest possible process stability is expected. This includes the significant reduction of pores and hot cracks, which EN AW-7075 tends to form during additive processing and welding processes. In addition, the grain refinement should improve the mechanical properties and increase the corrosion resistance of the material.
The Differential Fast Scanning Calorimetry (DFSC) method is applied to support the development of process adjustments according to the material. DFSC makes it possible to investigate the melting and cooling behavior of individual powder particles and therefor reflects and decisive process stages during laser beam melting, which is of great importance for the adjustment of the desired microstructure and the resulting properties.