摘要
对充氚和未充氚的抗氢-2不锈钢（HR-2）样品进行退火处理，利用正电子湮没寿命谱技术以及金相检验技术探讨不锈钢中氮和微缺陷的相互作用行为．未充氚样品中，影响正电子寿命值的主要因素为杂质元素在晶界的析出．充氚样品实验中，退火温度小于300℃时．正电子寿命值的增加说明了氦泡的形成过程为非热形成，通过“冲出位错环”机制形成及长大；退火温度在300-600℃之间，充氚样品正电子寿命值的降低以及He的跃迁概率的计算结果．说明He原子通过热迁移至晶界；退火温度大于600℃时，热平衡空位浓度的计算结果以及正电子寿命值的增加说明热平衡空位开始发挥作用．
After annealing treatment of stainless steel and stainless steel charged with tritium, the positron annihilation lifetime （PAL） spectrum is applied to investigate the interaction between helium and defects. From the results of calculation and experiment, it can be deduced that in the stainless steel not charged with tritium, PAL is affected mainly by the segregation of impurities in the grain boundary; while in the stainless steel charged with tritium, when T〈300℃, the increase of τ2 indicates that helium bubbles nucleate and grow by loop punching, so called athermal mechanism; when T〉300℃, the decrease of τ2 indicates that helium migrates to the crystal boundaries; when T〉 600℃, vacancies become active. The increase of τ2 indicates that the vacancies combine with helium in crystals.
出处
《物理实验》
2006年第11期11-17,共7页
Physics Experimentation
关键词
充氚不锈钢
氮
正电子寿命
退火
stainless steel charged with tritium
helium
positron annihilation lifetime
annealing
