在铁铝黄铜的显微组织中观察到3种形貌的Fe_3Al沉淀.通过显微组织发展的研究表明,Fe_3Al的3种形貌反映了其长大过程中的3个阶段.Fe_3Al初析出时和基体共格.粗化过程中,沉淀颗粒沿〈111〉方向生长,于是其形貌发生从立方到树枝状的变化,同时也失去了共格性.
Fe_3Al precipitates with three morphologies have been observed in themicrostructure of the brass containing aluminium and iron. Studies of the micro-structural development show that these three morphologies reflect three stages ofthe precipitate growth. The initially formed Fe_3Al precipitates are coherent withthe matrix. The growth of precipitates is along <111> direction during the coars-ening, which results in the change in morphology (from cubic to dendritic) and theloss of coherency of the precipitates.
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