Changes in Lattice parameter in Aluminium cast Alloys due to aging
Resumen
Aluminium alloys are widely used due to their combination of low weight and high strength resulting from heat treating, which takes place by heating-up the material at temperatures high enough for the alloying elements to dissolve into the aluminium matrix; the material is then cooled-down to room temperature at a rate fast enough for the alloying elements to remain in solution; strengthening occurs by aging, in which particles of different size, shape and nature precipitate from the supersaturated matrix promoting changes in the lattice parameter of the aluminium. X-ray diffraction analyses were conducted in different aluminium cast alloys after aging them at different temperatures for up to 100 hours, revealing that changes in the value of the lattice parameter of the aluminium matrix depends on the alloying elements. Aluminium-copper alloys have the tendency to increase the parameter due to precipitation of Al2Cu particles, whereas those that harden by precipitation of Mg2Si are affected to a lesser degree.Citas
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