A high resolution electron microscopic study of the microstructure in rapidly solidified Al-Li-Cu-Mg-Zr alloys |
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| Authors: | L. C. Zhang A. Q. He H. Q. Ye Y. C. Zhang |
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| Affiliation: | (1) Laboratory of Atomic Imaging of Solids, Institute of Metal Research, Academia Sinica, Wenhua Road, 110015 Shenyang, People's Republic of China;(2) Laboratory of Microcrystals, Institute of Metal Research, Academia Sinica, Wenhua Road, 110015 Shenyang, People's Republic of China;(3) Present address: State Key Laboratory of Advanced Metal Materials, University of Science and Technology Beijing, 100083 Beijing, People's Republic of China |
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| Abstract: | The microstructure in rapidly solidified Al-Li-Cu-Mg-Zr alloys has been reexamined by transmission electron microscopy (TEM). The results show that the weakening intermetallic phases, e.g. hexagonal, Z, face centred cubic (f.c.c), T, and tetragonal, H, (new phase) phases, exist in alloys with relatively high contents of Mg besides the strengthening phases. The sizes of these weakening intermetallic phases are on the scale of micrometres. The newly found tetragonal H phase, having parameters of a = 2.8 nm and c = 2.4 nm, was observed to coexist with the Z phase, and has a defined orientation relationship with the Z phase. High resolution images reveal that there are planar defects and 90 ° domains in the Z phase, multiple twins in the T phase, and two well defined crystallographic orientation relationships between the Z and T phases. |
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