Structural and compositional evolution of Al3(Zr,Y) precipitates in Al-Zr-Y alloy
Structural and compositional evolution of Al3(Zr,Y) precipitates in Al-Zr-Y alloy
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Al-Zr-Y 合金中 Al-3(Zr,Y) 析出物的结构和成分演变
DOI：
10.1016/j.matchar.2016.10.012
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发表时间：
2016-11-01
影响因子：
4.7
通讯作者：
Sun, Baode
中科院分区：
文献类型：
--
作者：
Gao, Haiyan;Feng, Wuqiang;Sun, Baode
采用原子探针层析（APT）、透射电镜（TEM）分析和第一性原理计算研究了Al-Zr-Y合金时效过程中Al-3（Zr，Y）相的结构和成分演变。结果表明，在分解初期析出的短棒状D 0（19）-Al 3 Y中有少量Zr原子固溶，在400 ℃时效2 h后，D 0（19）-Al 3 Y成为球形L1（2）-Al 3 Zr的异质形核。时效处理2 ~ 200 h，合金发生准静态粗化。而Al-3（Zr，Y）中Zr和Y原子分布均匀，不存在其它以L1（2）-Al 3RE为核心的含稀土Al-Zr-RE合金中的典型“Al（3）RE核-Al 3 Zr壳”结构。第一性原理计算结果表明，Al-3（Zr，Y）生长过程中Y和Zr原子间的结合能很强，导致Y和Zr原子共沉淀，从而导致Al-3（Zr，Y）的演化。(C)2016由Elsevier Inc.出版
Structural and compositional evolution of Al-3(Zr,Y) precipitates in aged Al-Zr-Y alloy was investigated through atom probe tomography (APT) and transmission electron microscope (TEM) analysis and first principles calculations. The results show that short-bar-shaped D0(19)-Al3Y with some Zr atoms dissolved in precipitated at the very beginning of decomposition and worked as heterogeneous nuclei for L1(2)-Al3Zr with spherical morphology after being aged at 400 degrees C for 2 h. Quasi-static coarsening happened as the aging treatment lasted from 2 h to 200 h. However, distribution of Zr and Y atoms in Al-3(Zr,Y) is nearly uniform and Al-3(Zr,Y) do not have the typical "Al(3)REcore-Al3Zr shell" structure which observed in other RE containing Al-Zr-RE alloys with L1(2)-Al3RE as nuclei. First principles calculations revealed that binding energy between Y and Zr is strong during the growth of Al-3(Zr,Y), which led to the co-precipitation of Y and Zr atoms and attribute to the evolution of Al-3(Zr,Y). (C) 2016 Published by Elsevier Inc.