Abstract
Fe-based metallic glasses (MG) have become the subject of extensive research in recent years due to their favorable mechanical and magnetic properties. In particular, the production of this type of materials in Laser Powder Bed Fusion (LPBF), also known as Selective Laser Melting (SLM) technology, is a kind of breakthrough, as it has become possible to produce elements of any shape. An important factor influencing the properties of the manufactured parts is their microstructure. For metallic glass Fe79Zr6Si14Cu1 with low glass-forming ability, produced in SLM technology, tests were carried out in the field of structural X-ray diffraction, Scanning Electron Microscopy, and Transmission Electron Microscopy. In addition, porosity analysis was compared with process parameters such as laser power and scanning speed. The paper shows that the fusion line comprises a solid solution α-Fe(Si) and low fraction of intermetallic Fe23Zr6 and FeZr2 phases. Furthermore, in the melt pool area, a nanometric α-Fe(Si) phase and an amorphous matrix was observed. The presented research results of the Fe79Zr6Si14Cu1 alloy produced for the first time in SLM technology will undoubtendly contribute to further optimization of parameters for elements produced in Additive Manufacturing technology using Fe-based MG.
Highlights
IntroductionCommercial FINEMET, NANOPERM, and HITPERM alloys produced to date were classified as soft magnetic alloys
The structural investigations of the new Fe79Zr6Si14Cu1 metallic glass with low glass-forming ability produced by selective laser melting technology led to the following conclusions: d Melting the following layer with a laser beam eliminates the solidified amorphous phase and partially transforms it into crystalline
It is often the a-Fe(Si) phase due to its crystallization temperature, which is 490 °C; according to the Selective Laser Melting (SLM) process conditions, it occurs in the highest amount
Summary
Commercial FINEMET, NANOPERM, and HITPERM alloys produced to date were classified as soft magnetic alloys Their exquisite magnetic properties are achived due to the formation of a nanocomposite, which consisting of ferromagnetic phases with nanometric size, surrounded by an amorphous matrix. A glass-forming element that prevents crystallization and the formation of large grains, was used in described alloys and other metallic glasses with soft magnetic properties. Iron-based amorphous alloys should have deep eutectics, large atomic size ratios, and negative enthalpy of mixing for individual alloying elements These criteria were met for a relatively new group of Fe-Zr-Si-Cu metallic glasses [11,12,13]. Collected research results can be fundamental to making it possible to overcome the limitations of SLM technology for a new group of Fe-based metallic glasses
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