A Study Of Process In Al₆₃Cu₂₅Fe₁₂ Quasicrystalline Combined With Mg/Al And Their Alloys

Being assisted by the China National Natural Science Fund of"Magnesium matrix composites reinforced by AlCuFe quasicrystlline particle"(Item Noumber: 50071030), the paper studied some preparations and applications of the Al₆₃Cu₂₅Fe₁₂ quasicrystalline materials. Al₆₃Cu₂₅Fe₁₂ powders were prepared by methods of conventional casting and atomizing. It explored the effect of heat-treatment condition on the phase transformation and how to prepare single phase composing Al₆₃Cu₂₅Fe₁₂ quasicrystalline powder. It studied the reaction mechanism between the Al₆₃Cu₂₅Fe₁₂ quasicrystalline particle and magnesium or aluminium, and the effect of the reaction product, the size of the Al₆₃Cu₂₅Fe₁₂ quasicrystalline particle, the different volume fraction and the different prepration of the (Al₆₃Cu₂₅Fe₁₂) p/Mg or Al alloys on organization and mechanic properties. The paper provided some exploring works on theory study and practice application of Al₆₃Cu₂₅Fe₁₂ quasicrystalline materials.In this paper, Al₆₃Cu₂₅Fe₁₂ quasicrystalline material prepared successfully by methods of conventional casting and atomizing. The almost single quasicrystalline phase constitution can be obtained by suitable process of heat-treatment. The boundry reaction mechanism between casting ingot Al₆₃Cu₂₅Fe₁₂ quasicrystalline material and Mg or Al was found. The composites of (Al₆₃Cu₂₅Fe₁₂) p/Mg or Al alloys composites were successfully prepared by different methods, and the effect of the different methods on mechanism properties was analysed. The main content of this paper is below:It is proposed that the conventional casting Al₆₃Cu₂₅Fe₁₂ quasicrystalline material is multi-phase structure. It is composed of i-Al6Cu2Fe,λ-Al13Fe4,β-AlFe(Cu) andÏ„-AlCu(Fe). The order of generation isλ-Al13Fe4,β-AlFe(Cu) , i- Al6Cu2Fe quasicrystalline phase andÏ„-AlCu(Fe) in the process of the cooling solidification. Furthermore, the phase constitutes and shape of phases was quite different matching to the diverse coolin g rates. The phase constitute of atomized powder is more simple than casting ingot, it is mainly composed of the icosahedral phase,β(Ï„) and littleλ,ω-Al7Cu2Fe. The relative content of the phases is very different incording to the size of the powder. The i-phase increases with the decreasing of the size. After annealing, the i-phase increases and theβ-phase decreases. The temperature of the heat-treatment is the key factor of the i-phase content in the powder. Almost single i-phase constitute can be obtained at the condition of 850℃for 12hours.Serious reaction occurred between the Al₆₃Cu₂₅Fe₁₂ particles and matrix metal in the process of compounding by stir-casting, the i-phase gradually became unstable, released off free Cu, then Cu diffuse into matrix metal, in the meantime, the matrix...