基于微观相场动力学模型,以Ni<,75>Al<,25-x>V<,x>合金为对象,研究时效温度变化对沉淀相竞争生长机制及筏状组织形成的影响.结果表明:相的生长和粗化存在各向异性和竞争机制;当具有生长各相异性的DO<,22>相数量较少、尺寸较大时,易形成单一方向排布的组织,从而促使具有生长各向同性的L12相也沿着特定的方向生长,最终形成具有高度择向生长的"筏状"组织,且随着时效温度的降低,沉淀相提前析出;若L12相先析出,时效温度越低,DO<,22>相越多,组织筏化越不明显;若DO<,22>先析出,时效温度越低,DO<,22>相越少,组织筏状越显著.
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