| Title |
Effect of Oxygen on Phase Boundary in Dilute Nb Area of Zr-Nb Alloy |
| Authors |
김윤선(Kim Yun Seon); 김현길(Kim Hyeon Gil); 홍순익(Hong Sun Ig); 정용환(Jeong Yong Hwan) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Sponge Zr; Zr-Nb; Alpha; Beta; Monotectoid; Microstructure; Precipitation |
| 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.％. |