摘要
采用STEM-ED研究了稀土在Ni_3Al奥氏体合金中的分布。结果表明,含有0.095wt％RE的Ni_3Al合金在450℃—480℃之间保温时,发现RE在奥氏体晶界有显著的偏聚。在950℃以上保温,晶界上没有发现RE的偏聚。同时,当Ni_2Al合金在550℃—650℃之间保温时,产生了含Ni、Al和RE的第二相均匀析出。
STEM-ED studies are made on the distribution of rare earth elements in austenitic Ni_3Al al- loys.The observed data indicate: ％wt RE Holding segregation at grain boundaries in Ni_3Al alloy Temperature elements amount segregated 0.095 450—450℃ RE significant 0.095 950℃ RE no second-phase containing uniformly 0.095 550—650℃ Ni,Al ＆RE segregated
