用差示扫描量热法(DSC)研究了含氢20-240μg/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 20-240μg/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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