Fig. 2. X-ray diffraction patterns of the composites containing 20%, 40% and 60% of Al65Cu20Fe15 powder and the reference sample of compacted pure Al powder.Figure optionsDownload full-size imageDownload as PowerPoint slide
The TEM examination revealed that Al2Cu phase is located in the interface of the QC particles and the matrix. In Fig. 3 the bright-field image shows the Al2Cu phase close to the spherical QC particles. The AA 29504 diffraction patterns and the result of EDS analysis confirmed this phase as well as the presence of the icosahedral quasicrystalline phase (3-fold symmetry) inside the particle. The i-phase occurs in the form of dendrites and coexist with τ-Al(Cu, Fe) phase lying between them.
Fig. 3. TEM bright-field image and corresponding electron diffraction patterns of 3-fold symmetry of i-phase and θ-Al2Cu phase ([0 1 1] zone axis) for the composite containing 60% of Al65Cu20Fe15 powder.Figure optionsDownload full-size imageDownload as PowerPoint slide