Abstract
The microstructure, hardness, and precipitate free zones (PFZ) of V55Ti30Ni15 alloys during heat treatment have been investigated in this study. The microstructure resulting from different heat treatment conditions has a great influence on hardness. The microstructure resulting from different heat treatment conditions has a great influence on hardness. Fine NiTi particles precipitate from the supersaturated V-matrix solid solution at 750 °C, increase in quantity until 800 °C, and then dissolve back into the V-matrix at 850 °C. The resultant hardness decreases with temperature until 800 °C, and then increases from 800 to 850 °C. The microstructure containing small NiTi precipitates resulting from the treatment of 18 h at 800 °C has a good soft condition for workability. PFZ formed at the grain boundary of V-matrix during heat treatment was observed. Vacancies depletion in V-matrix maybe led to the formation of PFZ.
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The authors would like to thank China Scholarship Council for the financial support for Peng Jiang’s study at CSIRO.
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Jiang, P., Yu, YD., Song, GS. et al. Precipitation Softening and Precipitate Free Zones of V55Ti30Ni15 Alloys During Heat Treatment. Acta Metall. Sin. (Engl. Lett.) 28, 15–21 (2015). https://doi.org/10.1007/s40195-014-0149-9
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DOI: https://doi.org/10.1007/s40195-014-0149-9