针对奥氏体合金中次生η相与基体位向关系存在的不同看法,研究了铁镍基奥氏体合金大量次生η相的析出机理.结果表明,η相与基体之间有良好的共格关系:{001}η//{111}γ,〈110〉γ//〈210〉η.晶界η相首先在一般无规晶界γ'相处通过不全位错滑移产生堆垛层错带的方式形核,之后通过原子控制长程扩散机制的台阶方式在基体中长大,进入晶界另一侧与之匹配差的晶粒中,晶界随之一起迁动.η相的析出伴随着附近区域γ'相的溶解和消失.
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