Dissolution and precipitation behaviors of hydries in N18, Zry-4 and M5 alloys

作者：Tang Rui^*; Yang Xiaoxue

来源：International Journal of Hydrogen Energy, 2009, 34(17): 7269-7274.

DOI：10.1016/j.ijhydene.2009.07.018

• Zr-based alloys
• Terminal solid solubility
• Dissolution
• Precipitation
• Differential scanning calorimetry

The terminal solid solubilities of hydrides dissolution (TSSD) during heatup and precipitation (TSSP) during cooldown for N18, Zry-4 and M5 alloys with hydrogen concentrations of 20-240 ppm were measured by differential scanning calorimetry (DSC) in the range of 50-500 degrees C. There is little difference in either TSSD or TSSP solvi among these alloys, and best-fit equations were derived from the two solvi. A significant hysteresis between the solvi of TSSD and TSSP occurred, resulting from the hydride-matrix volumetric misfit strain. Based on the widths of the DSC peaks obtained during cooldown, the average precipitation rates of zirconium hydrides from the super-saturated state were evaluated by best-fit equations. The hydride precipitation is rate-controlled by hydrogen diffusion, and the average rates increased with increasing temperature.

• 出版日期2009-9
• 单位中国核动力研究设计院