科研之友
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摘要
The effect of the addition of chromium between 0.1?% and 0.3?% on the structure and properties of Al‐7Si‐0.35Mg‐0.02Sr alloy was studied. The results show that as the chromium content increases, the alloy grains are refined, and the grains appear fine equiaxed after 0.2?% chromium addition. At the same time, chromium combines with iron to form AlCrFeSi phase, which significantly improves the iron phase morphology, making it change from needle shape to fish bone shape. In the aging stage, the Al13Cr4Si4 phase is dispersed in the alloy, and its phase relationship with the matrix is semi‐coherent and non‐coherent. When the chromium content continues to increase, the degree of dispersion of the Al13Cr4Si4 phase is higher, but the performance of the alloy decreases, because the chromium containing precipitate phase consumes magnesium and silicon solute atoms from the nearby melt, making the amount of magnesium silicide decrease. The Al‐7Si‐0.35Mg‐0.02Sr alloy with 0.2?% chromium showed the best mechanical properties (ultimate tensile strength, yield strength, elongation and hardness).(#br)This article combines the needs of practical applications, starting from reducing the production cost of enterprises. Based on the hypoeutectic Al‐7Si casting alloy and selecting conventional cheap alloy elements, a new type of high‐performance aluminum alloy material composition is designed, in order to contribute to the research direction of material lightweight development.
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