THE EXPERIMENTAL STUDIES OF NiO CLUSTER FORMATION IN Ni_3Al ALLOYS BY AP-FIM
THE EXPERIMENTAL STUDIES OF NiO CLUSTER FORMATION INNi_3Al ALLOYS BY AP-FIM

1. IntroductionFOr maily years, the room temperature brittleness of the polyer}l'stalline Ni3AI was recognized to be "intrinsically brittl.5,1'2] due to brittle grain--boundary fracture. Recentlyit hajs been shown that environmental embrittlement is a major cause of the poor ductiLity of NiaAI in air3--sl, and the embrittlement mechanism involves chemical .eactio.sfsl=M HzO-MO ZH or M HaO-MOH H. Where M is a reactive element in the intermetallic compound (Ni and Al) which reacts ch…