| Title |
TEM Study on the Structural similarity between Al13Fe4 and decagonal Phase in rapidly solidified Al - Fe alloys |
| Abstract |
Quasicrystalline and quasicrystal-related crystalline phases in rapidly solidified Al-Fe alloys have been investigated by a detailed TEM(transmission electron microscopy). Rapidly solidified Al-10at %Fe mainly consists of α-Al and microquasicrystalline phase. The decagonal phase particles with a dendritic shape are also present as a primary solidification product in the relatively slowly cooled region of the ribbon. Rapidly solidified Al-20at%Fe consists of α-Al and Al_(13)Fe₄ phase. The Al_(13)Fe₄ phase particles have a dendritic shape with ten branches due to (201) and (100) ten fold twinning of Al_(13)Fe₄ monoclinic structure. Detailed SADP(selected area electron diffraction pattern) analysis has shown that there exists a close similarity between the diffraction characteristics of the decagonal phase and Al_(13)Fe₄. The present study also shows that the quasicrystalline structure of the decagonal phase decomposed into ten fold twinned Al_(13)Fe₄ structure with heat treatment. |