Effects of temperature change on the microstructural evolution of vanadium alloys under ion irradiation
Effects of temperature change on the microstructural evolution of vanadium alloys under ion irradiation
复制标题
离子辐照下温度变化对钒合金显微组织演变的影响
DOI：
10.1016/s0022-3115(00)00106-9
复制
发表时间：
2000
影响因子：
3.1
通讯作者：
H. Matsui
中科院分区：
文献类型：
--
作者：
N. Nita;T. Iwai;K. Fukumoto;H. Matsui
仔细研究了钒合金在上下温度变化后的组织演变。在东京大学(HIT)的高通量辐照设备中，钒合金进行了辐照。辐照是在500°C的恒定温度下进行的，或者以350/500°C、400/500°C、450/500°C、500/350°C或350/500/350°C至0.5或0.75 dpa的逐步温度序列进行。350/500℃和400/500℃温度变化辐照后，观察到了小的位错环。这些位错环的密度随着预辐照温度的升高而减小。450/500°C辐照后，显微组织粗大，表明初始温度(450°C)足够高，处于缺陷生长主要发生的区域。在温度向下变化的情况下，观察到比高温辐照更粗大的显微组织。这种明显的反常现象可以用利率理论来理解。
The evolution of microstructure in vanadium alloys after upward and downward temperature changes has been closely examined. Vanadium alloys have been irradiated in the high fluence irradiation facility at the University of Tokyo (HIT). Irradiations have been performed either at constant temperature of 500°C or in a stepwise temperature sequence of either 350/500°C, 400/500°C, 450/500°C, 500/350°C or 350/500/350°C up to 0.5 or 0.75 dpa. After 350/500°C and 400/500°C temperature change irradiations, small dislocation loops have been observed. The density of these dislocation loops decreased with the pre-irradiation temperature. After 450/500°C irradiation, the microstructure was coarse, indicating that the initial temperature (450°C) was high enough to be in the regime, where the growth of defects mainly occurs. In the case of downward temperature change, microstructures coarser than those of higher temperature irradiations were observed. This apparent anomaly may be understood in terms of the rate theory.