期刊
MATERIALS
卷 14, 期 12, 页码 -出版社
MDPI
DOI: 10.3390/ma14123172
关键词
zirconium powders; SPS; severe plastic deformation; relative density; hardness; phase composition; tensile tests; corrosion resistance
类别
资金
- National Science Center in Poland [OPUS14, UMO-2017/27/B/ST8/01751]
- Faculty of Non-Ferrous Metals of AGH University of Science and Technology [16.16.180.006]
Materials were prepared using commercial zirconium and niobium powders, with high relative densities achieved using SPS and extrusion methods. Niobium acted as a beta-Zr phase stabilizer, significantly increasing corrosion resistance in the obtained materials.
Materials were obtained from commercial zirconium powders. 1 mass%, 2.5 mass% and 16 mass% of niobium powders were used as the reinforcing phase. The SPS method and the extrusion method classified as the SPD method were used. Relative density materials of up to 98% were obtained. The microstructure of the sintered Zr-xNb materials differs from that of the extruded materials. Due to the flammability of zirconium powders, no mechanical alloying was used; only mixing of zirconium and niobium powders in water and isopropyl alcohol. Niobium was grouped in clusters with an average niobium particle size of about 10 mu m up to 20 mu m. According to the Zr-Nb phase equilibrium system, the stable phase at RT was the hexagonal alpha-phase. The tests were carried out for materials without the additional annealing process. The effect of niobium as a beta-Zr phase stabilizer is confirmed by XRD. Materials differed in their phase composition, and for both methods the beta-Zr phase was present in obtained materials. A very favorable effect of niobium on the increase in corrosion resistance was observed, compared to the material obtained from the powder without the addition of niobium.
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