用原子探针层析技术和时效模拟方法,研究了不同Ni含量并且提高了Cu含量的反应堆压力容器(RPV)用模拟钢中富Cu,富Ni和富Mn原子团簇的形成.结果表明,提高钢中的Ni含量会促使富Cu原子团簇的析出,富Cu原子团簇中含有Ni和Mn.实验检测到富Ni的原子团簇,团簇中含有Cu和Mn,富Ni原子团簇可以作为富Cu原子团簇析出时的形核区.实验还检测到富Mn原子团簇,当Mn原子团簇中含有较高的Ni时,它也可以成为富Cu原子团簇析出时成核的地方.由于钢中的合金元素Ni在形成富Ni原子团簇后会成为富Cu原子团簇析出时成核区,因而提高Ni的含量将促进富Cu原子团簇的析出,这是合金元素Ni会增加压力容器钢中子辐照脆化敏感性的本质原因.
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