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<p>It is well known that producing bulk metallic glasses requires very high cooling rates during processing. This limits the sizes of elements produced by casting methods and is why the alternative technology, additive manufacturing, is explored as a development method for bulk metallic glass with no geometry restrictions. Among the tested alloys with high glass ability, Co-based alloys have not yet been printed successfully. This work investigated the possibility of developing a fully amorphous sample from Co-based alloy with high glass-forming ability using selective laser melting focusing on alloy Co<sub>47.6</sub>B<sub>21.9</sub>Fe<sub>20.4</sub>Si<sub>5.1</sub>Nb<sub>5</sub>. This study contains literature analyses and experimental tests of selective laser melting (SLM). After printing, the samples were analyzed by optical microscopy, scanning electron microscopy, scanning transmission microscopy, differential thermal analysis, X-ray diffraction, and nanohardness testing. The best set of parameters was established: laser power of 65&#xa0;W and scanning speed of 500&#xa0;mm/s. Other parameters, constant during the experiment, were laser spot diameter of 0.11&#xa0;mm, hatch spacing 77&#xa0;µm, and layer thickness 25&#xa0;µm. The main finding is that it is possible to develop fully amorphous samples from Co-based alloys by selective laser melting and samples printed from Co<sub>47.6</sub>B<sub>21.9</sub>Fe<sub>20.4</sub>Si<sub>5.1</sub>Nb<sub>5</sub> are the first fully amorphous samples of Co-based alloy printed by SLM. Furthermore, an extensive discussion of the results was conducted with conclusions for further optimization of the process to enhance the quality of the samples, namely reducing the porosity and cracking phenomena. This study contributes to the area of bulk metallic glasses printing, especially in the case of a group of alloys based on cobalt.</p>

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First Co-based Bulk Metallic Glass Printed by Selective Laser Melting

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月31日

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  • Anna Kuś,
  • Viktória Rajťúková,
  • Wirginia Pilarczyk,
  • Radovan Hudák,
  • Thomas Mehner,
  • Łukasz Maj,
  • Thomas Lampke,
  • Aleksandra Małachowska

摘要

It is well known that producing bulk metallic glasses requires very high cooling rates during processing. This limits the sizes of elements produced by casting methods and is why the alternative technology, additive manufacturing, is explored as a development method for bulk metallic glass with no geometry restrictions. Among the tested alloys with high glass ability, Co-based alloys have not yet been printed successfully. This work investigated the possibility of developing a fully amorphous sample from Co-based alloy with high glass-forming ability using selective laser melting focusing on alloy Co47.6B21.9Fe20.4Si5.1Nb5. This study contains literature analyses and experimental tests of selective laser melting (SLM). After printing, the samples were analyzed by optical microscopy, scanning electron microscopy, scanning transmission microscopy, differential thermal analysis, X-ray diffraction, and nanohardness testing. The best set of parameters was established: laser power of 65 W and scanning speed of 500 mm/s. Other parameters, constant during the experiment, were laser spot diameter of 0.11 mm, hatch spacing 77 µm, and layer thickness 25 µm. The main finding is that it is possible to develop fully amorphous samples from Co-based alloys by selective laser melting and samples printed from Co47.6B21.9Fe20.4Si5.1Nb5 are the first fully amorphous samples of Co-based alloy printed by SLM. Furthermore, an extensive discussion of the results was conducted with conclusions for further optimization of the process to enhance the quality of the samples, namely reducing the porosity and cracking phenomena. This study contributes to the area of bulk metallic glasses printing, especially in the case of a group of alloys based on cobalt.