定向凝固Al-Y合金组织演化规律及小平面相生长*II. Al-53%Y包晶合金组织演化规律
收稿日期: 2015-12-03
网络出版日期: 2016-04-26
基金资助
* 国家自然科学基金项目51425402, 51371066和51331005资助
MICROSTRUCTURE EVOLUTION AND GROWTH BEHAVIORS OF FACETED PHASE IN DIRECTIONALLYSOLIDIFIED Al-Y ALLOYS II. Microstructure Evolution of Directionally Solidified Al-53%Y Peritectic Alloy
Received date: 2015-12-03
Online published: 2016-04-26
Supported by
Supported by National Natural Science Foundation of China (Nos.51425402, 51371066 and 51331005)
对Al-53%Y (质量分数)包晶合金在1~100 μm/s的抽拉速率下进行定向凝固实验, 研究了合金组织演化及包晶合金中两相的竞争和生长行为. 结果表明, 铸态Al-53%Y合金的显微组织主要由初生Al2Y相、包晶Al3Y相和Al3Y/Al共晶体组成. 在低速1 μm/s定向凝固过程中, 初生相与包晶相均连续生长, 出现了平行于固/液界面的近似带状组织. 随着凝固距离的增加, 固/液界面处的领先相由初生Al2Y转变为包晶Al3Y, 固/液界面为粗大条形Al3Y相, 而无初生相. 在较高抽拉速率的定向凝固过程中, 随着抽拉速率的增加, Al2Y相由平界面生长转变为胞状形态, 后又转变为枝晶状. 包晶相Al3Y最初以锯齿状包裹在初生相表面, 同时在液相中以细针状直接析出, 抽拉速率越大, 包晶相Al3Y数量越多且尺寸越细小. 随着凝固距离的延长, 包裹初生相的包晶相厚度增加, 体积分数增大. 另外, 从液相中直接析出的Al3Y相逐渐长大, 由细针状变为短棒状、块状, 均匀分布在包晶组织周围并与之相连接.
刘桐 , 骆良顺 , 张延宁 , 苏彦庆 , 郭景杰 , 傅恒志 . 定向凝固Al-Y合金组织演化规律及小平面相生长*II. Al-53%Y包晶合金组织演化规律[J]. 金属学报, 2016 , 52(7) : 866 -874 . DOI: 10.11900/0412.1961.2015.00620
Peritectic reaction is frequently encountered in many technologically important materials (e.g., steels, brass, bronze, intermetallic compounds, magnetic materials and YBa2Cu3Ox superconductors). Many interesting microstructures have been found during directional solidification of peritectic alloys, which have drawn much attention since last decade. In this work, in order to investigate the growth behavior of Al3Y phase as a peritectic phase, directioanal solidification experiments at different pulling rates have been performed on Al-53%Y (mass fraction) peritectic alloy. The results show that the primary phase and the peritectic phase both grow continuously, the microstructure, which is parallel to the solid-liquid interface has been found and explained at a low pulling rate (V=1 μm/s). With the growth distance increase, the precipitating solid phase from the liquid at the quenching solid-liquid interface transforms from primary Al2Y phase to peritectic Al3Y phase. The interface consists of coarse Al3Y phase without Al2Y phase. At relatively high pulling rates, the morphologies of primary Al2Y phase transit from continuous growth to cellular phase, and further to dendrites with the pulling rate increase. The results also show that the primary phase is enclosed with the serrate peritectic phase, and Al3Y phase precipitates from the liquid in needle shape at the same time. With the growth distance further increase, Al3Y phase become thicker and more numerous. In addition, the Al3Y phase precipitated from liquid transit from needle shape to short rod and lump shape, which distributes around the peritectic structure.
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