| Abstract |
| The phase boundary and Nb solubility of Zr-xNb binary alloys containing 2000 ppm oxygen were investigated by using DSC, metallography and TEM. To obtain the equilibrium phase, the alloys of Zr containing 0 to 10 wt.％ Nb were annealed for a long time at different temperature. The phase transformation temperature from alpha to alpha+beta and alpha+beta to beta in the Zr containing 2000 ppm oxygen was analyzed at 980℃ and 1025℃. The phase transformation temperature of the Zr containing 2000 ppm oxygen was increased than that of the Zr having 700 ppm oxygen. The monotectoid temperature of the Zr-Nb alloys containing 2000 ppm oxygen was revealed at 585℃. From the analysis of precipitates using TEM equipped EDS, Nb-containing precipitates were observed on the Zr-0.2Nb alloy that annealed at monotectoid temperature. This means that the maximum Nb solubility in Zr-xNb binary alloy containing 2000 ppm oxygen would be lower than 0.2 wt.％. |
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| Key Words |
| Sponge Zr, Zr-Nb, Alpha, Beta, Monotectoid, Microstructure, Precipitation |
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