Precipitation behaviour of Al3Zr precipitate in Al-Cu-Zr and Al-Cu-Zr-Ti-V alloys
Precipitation behaviour of Al3Zr precipitate in Al-Cu-Zr and Al-Cu-Zr-Ti-V alloys
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DOI：
10.1016/s1003-6326(11)61398-8
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发表时间：
2012-08-01
影响因子：
4.5
通讯作者：
Massinon, Denis
中科院分区：
文献类型：
--
作者：
Jia Zhi-hong;Couzinie, Jean-Philippe;Massinon, Denis
用透射电子显微镜研究了Al-Cu-Zr和Al-Cu-Zr-Ti-V合金中Al3Zr的析出行为。亚稳Al3Zr析出物在枝晶中心均匀形核，分布均匀。然而，枝晶间的析出过程比较复杂，观察到了螺旋状和条状的析出形态，由许多球状的Al3Zr析出物组成。条状析出团沿<；100>；Al方向有择优取向，推测与theta‘(Al2Cu)和theta相有关。添加铜可以加速Al3Zr析出物的L1(2)-Gt；D0(23)结构转变。
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 theta'(Al2Cu) and theta phases. Addition of Cu can accelerate the L1(2)-> D0(23) structural transformation of the Al3Zr precipitate.