Precipitation behaviour of Al3Zr precipitate in Al-Cu-Zr and Al-Cu-Zr-Ti-V alloys

来源期刊:中国有色金属学报(英文版)2012年第8期

论文作者:贾志宏 Jean-Philippe COUZINIE Nadia CHERDOUDI Ivan GUILLOT Lars ARNBERG Petter ASHOLT Stig BRUSETHAUG Bruno BARLAS Denis MASSINON

文章页码:1860 - 1865

关键词:铝合金;Al3Zr析出相;相转变

Key words:aluminium alloys; Al3Zr precipitate; phase transformation

摘    要:利用透射电子显微技术研究Al-Cu-Zr和Al-Cu-Zr-Ti -V合金中Al3Zr的沉淀析出行为。亚稳态的Al3Zr沉淀相在枝晶中心均匀形核并获得均匀分布。然而,在枝晶边缘区域的析出复杂,观察到由许多球形Al3Zr析出颗粒组成的螺旋状和条状的形貌。条状的沉淀团簇沿<100>铝方向优先排列,这可能与Al2Cu的亚稳态θ′和稳态θ析出相相关。添加铜有利于Al3Zr沉淀相从L12→D023的结构转变。

Abstract: The precipitation behaviours of Al3Zr precipitate in the Al-Cu-Zr and Al-Cu-Zr-Ti-V alloys were studied by transmission electron microscopy. Metastable Al3Zr precipitates are homogeneously nucleated in dendrite centres resulting in homogeneous distribution. However, the precipitation in the interdendritic regions is complex and the precipitation morphologies, helical-like and stripe-like shapes, were observed, which are composed of many spherical Al3Zr precipitates. The stripe-like precipitate clusters have preferential orientations along with the <100> Al directions, which is inferred to be related to θ′(Al2Cu) and θ phases. Addition of Cu can accelerate the L12→D023 structural transformation of the Al3Zr precipitate.

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