Powder Diffraction Data for the α H Intermetallic Phases with Slight Variation in Composition in the System Al-Fe-Si
1987; Cambridge University Press; Volume: 2; Issue: 1 Linguagem: Inglês
10.1017/s0885715600012203
ISSN1945-7413
Autores Tópico(s)Aluminum Alloys Composites Properties
ResumoAbstract Based on high purity constituents ternary AlFeSi intermetallic phases were prepared and annealed at 600°C for a month with compositions close to that of α H -AlFeSi (Al 8 Fe 2 Si) phase (∼8 wt.% Si, ∼32 wt.% Fe). The powder diffraction patterns and the chemical compositions of the different α H -AlFeSi intermetallic compounds formed as major components in the samples were investigated by X-ray powder diffraction and electron microprobe analysis, respectively. A complete powder diffraction pattern is presented for the α H -AlFeSi intermetallic phase with 8 wt.% silicon and 33.5 wt.% iron content formed almost congruently. The refined cell parameters are given as a = 12.4056 (7) Å c = 26.236 (2) Å Comparing the observed intensities with intensities calculated from single crystal data, gave very good agreement. The lattice parameters of α H -AlFeSi phases with different silicon content were refined by the least-squares method. A contraction of the unit cell caused by the increase of the silicon content in the phase can be observed. Relative changes of the cell dimensions for 1 wt. % increase in silicon are −0.06%, −0.09 % and −0.21 % for the parameters a and c and for the unit cell volume, V, respectively.
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