用差示扫描量热法(DSC)研究了含氢20--240 μg/g的N18、Zry--4和M5三种锆合金加热时氢化物完全溶解时的固溶度(TSSD)和冷却时氢化物开始析出时的固溶度(TSSP)并使用TSSD或TSSP数据拟合出最优方程.结果表明, 这些合金的TSSD或TSSP差别都很小, TSSD与TSSP之间都存在显著的滞后,是氢化物与基体间的体积错配应变所导致. 根据冷却时DSC放热峰的宽度,计算出氢化物从过饱和固溶体中析出的平均速率, 并拟合出最优方程.氢化物析出的活化能与氢在锆合金中的扩散激活能近似, 表明氢化物的析出受到氢扩散的控制.
The terminal solid solubilities for dissolution of hydrides (TSSD) during heating–up and for precipitation of hydrides (TSSP) during cooling–down for N18, Zry–4 and M5 with hydrogen concentrations of 20–240 μg/g were measured by differential scanning calorimetry (DSC). The results show that the difference in TSSD or TSSP is very small for these alloys, and best–fit equations were derived. 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 cooling–down, the average precipitation rates of zirconium hydrides from super–saturated state were evaluated by best–fit equations. The activation energies of precipitation rates were approximately equivalent to the reported values of hydrogen diffusion in Zircaloys, indicating a hydrogen diffusion mechanism.
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