Journal
MATERIALS
Volume 14, Issue 19, Pages -Publisher
MDPI
DOI: 10.3390/ma14195536
Keywords
niobium; tungsten; zirconium; high-strength metal alloys; plasma spheroidization; additive manufacturing
Categories
Funding
- NASA [80NSSC18P2157]
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Niobium-based tungsten alloys are ideal for high-temperature structural applications, but are limited by their room-temperature ductility and fabricability. Powder bed fusion additive manufacturing can help process alloys with limited ductility, with post-processing heat treatments required to improve mechanical properties.
Niobium-based tungsten alloys are desirable for high-temperature structural applications yet are restricted in practice by limited room-temperature ductility and fabricability. Powder bed fusion additive manufacturing is one technology that could be leveraged to process alloys with limited ductility, without the need for pre-alloying. A custom electron beam powder bed fusion machine was used to demonstrate the processability of blended Nb-1Zr, Nb-10W-1Zr-0.1C, and Nb-20W-1Zr-0.1C powders, with resulting solid optical densities of 99+%. Ultimately, post-processing heat treatments were required to increase tungsten diffusion in niobium, as well as to attain satisfactory mechanical properties.
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