Abstract
The effect of different amounts (0 wt%, 0.02 wt%, 0.04 wt%, 0.06 wt%) of Sr modification on the microstructure of AlSi5Cu1Mg alloy was investigated. The wear resistances of the alloys were tested using an MMD-1 pin-on-disk wear-testing apparatus. Worn surfaces were examined using a scanning electron microscopy equipped with an energy-dispersive spectrometer. The relationship between the microstructure and wear properties of the alloy was discussed. The results show that the addition of Sr caused the grain refinement and AlSi5Cu1Mg with 0.04 wt% Sr has short rod-like Fe-rich intermetallic, minimal size of α-Al phase and secondary dendrite arm spacing, and granular or fibrous eutectic Si phase distributed uniformly at grain boundaries. Compared to the matrix alloy, the tensile strength, Brinell hardness, and elongation of the AlSi5Cu1Mg with 0.04 wt% Sr increased by 15%, 48%, and 73%, respectively. Both the lowest friction coefficient and the best wear resistance were achieved by the AlSi5Cu1Mg with 0.04 wt% Sr. Compared to the matrix alloy, the wear mass loss and friction coefficient of the AlSi5Cu1Mg with 0.04 wt% Sr increased by 42% and 18%, respectively. The adhesive wear and abrasive wear are the main wear mechanisms.
Highlights
Aluminum alloy is often applied as a structural material in the aerospace, electronics, and automotive industries
The wear resistance of Al-Si alloy is not good enough to make them wide applied as wear resistance materials which limits their use
Wear resistance of the cast alloy is significantly influenced by the microstructure of the alloy, including the size and shape of Fe-rich intermetallic, coarse eutectic Si phase, and minimal a-Al phase and its secondary dendrite arm spacing (SDAS).[5]
Summary
Aluminum alloy is often applied as a structural material in the aerospace, electronics, and automotive industries. Few works have been done about the effect of Sr addition on the microstructure and wear resistance of Al-Si eutectic alloy. Additive Sr was used to modify the microstructures of AlSi5Cu1Mg alloys, as well as to improve its wear resistance.
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