RAPIDLY SOLIDIFIED AL-CU ALLOYS .1. EXPERIMENTAL-DETERMINATION OF THE MICROSTRUCTURE SELECTION MAP
RAPIDLY SOLIDIFIED AL-CU ALLOYS .1. EXPERIMENTAL-DETERMINATION OF THE MICROSTRUCTURE SELECTION MAP
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DOI：
10.1016/0956-7151(93)90237-m
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发表时间：
1993-12-01
期刊：
影响因子：
--
通讯作者：
KURZ, W
中科院分区：
文献类型：
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作者：
GILL, SC;KURZ, W
对Cu含量分别为36、40和44wt%的Al-Cu合金进行了激光快速凝固实验。通过从激光迹线的表面取薄箔，已经可以使用TEM研究所得到的生长形态;微结构取向允许将形态与它们的局部生长速度相关联。在0.01-2.0 ms-1的速度范围内的微观结构特征进行了研究，共晶（有和没有振荡不稳定性），树枝状，细胞状，带状和平面前生长都已观察到。通过将这些结果与早期对具有较低Cu浓度的合金的观察相结合，可以产生Al-Cu合金的微观结构选择图。该图将微观结构与0.01-2.0 ms-1范围内的生长速度和组成以及0-44重量% Cu（即二元Al-Al 2Cu共晶的主要部分（0-54重量% Cu））相关联。除了提供凝固结构的有趣概述外，该图的几个特征可用于获得Al-Cu相图的信息。
Laser rapid solidification experiments have been performed on Al-Cu alloys of hypereutectic composition 36, 40 and 44 wt% Cu. By taking thin foils from the surface of the laser traces it has been possible to study the resulting growth morphologies using TEM; the microstructural orientation allowing the morphologies to be correlated with their local growth velocities. Microstructural features in the velocity range 0.01-2.0 ms-1 have been studied, and eutectic (both with and without oscillatory instabilities), dendritic, cellular, banded and planar front growth have all been observed. By combining these results with earlier observations made on alloys with lower Cu concentrations, it has been possible to produce a microstructure selection map for Al-Cu alloys. The map correlates microstructure to growth velocity and composition in the ranges 0.01-2.0 ms-1 and 0-44 wt% Cu, i.e. the major part of the binary Al-Al2Cu eutectic (0-54 wt% Cu). As well as providing an interesting overview of solidification structures, several features of this map can be used to gain information on the Al-Cu phase diagram.