THE SOLID SOLUBILITY OF FE IN ALPHA-ZR - A SECONDARY-ION MASS-SPECTROMETRY STUDY

[摘要] Secondary ion mass spectrometry techniques have been used to determine the terminal solid solubility (TSS) of Fe in alpha-Zr. Single crystals of nominally pure and Fe-doped alpha-Zr were annealed in the temperature range 770-1100 K to promote equilibration of Fe between surface Zr3Fe precipitates, or beta-Zr(Fe), and alpha-Zr. The results are fair in overall agreement with a recent investigation, based on thermoelectric power measurements, but they differ in detail. In particular this work indicates two regions of temperature dependence: above 930 K the TSS (ppma) is given by C(Fe) = 1.56 X 10(10) exp(-1.70 +/- 0.05 eV/kT), at lower temperatures a weaker temperature dependence is associated with extrinsic effects. In addition, the eutectoid temperature is shown to lie between 1063 and 1068 K.

[发布日期] 1994-06-01