Abstract
Abstract The Ti-(11–15)Nb–18Zr (at.%) alloys with low oxygen content and fine grain microstructure were successfully prepared by low temperature sintering after dielectric barrier discharge plasma (DBDP) milling of hydride (TiH2, ZrH2) and Nb powders. Hydride powders effectively reduced the oxygen content and lower the sintering temperature of Ti- (11–15) Nb–18Zr alloys. DBDP milling quickly refined and activated the TH2-Nb-ZrH2 powders without increased contamination by oxygen. The decrease in sintering temperature (as low as 1000 °C) helped to reduce the grain size of the Ti-(11–15)Nb–18Zr alloys to 3–8 μm, which has significantly increased the strength of the alloys. The reduction of oxygen content (as low as 0.4 wt%) in the Ti-(11–15)Nb–18Zr alloys benefited the superelasticity of the alloys. Among them, the Ti–12Nb–18Zr alloys presents an excellent superelasticity of about 1.5%, which is the highest value ever reported in the sintered Ti–Nb based SMAs.
Published Version
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