Abstract
The effect and mechanism of trace amounts of Sr and Sc in the A380 alloy under ultrasonic vibration (ultraviolet) modification on the microstructure and mechanical properties were investigated. The...
Highlights
Al–Si alloys are widely applied in the automobile, spacecraft, and aviation fields because of their high specific strength, high corrosion resistance, and low thermal expansion coefficient
It can be seen that the hardness increased with the increase in the Sr + Sc content and decreased after a critical doping level
The results showed that the microstructure and mechanical properties of the A380 alloy were improved with increasing the Sr + Sc content and the application of UV treatment
Summary
Al–Si alloys are widely applied in the automobile, spacecraft, and aviation fields because of their high specific strength, high corrosion resistance, and low thermal expansion coefficient. The high Si content in the alloys imparts good castability, fluidity, and a low tendency for hot cracking. The strength and toughness of these alloys are too low for many practical structural components. The performance of the A380 alloy is mainly affected by coarse dendritic grains and the coarse acicular eutectic Si phase.[1,2,3] the grain refiner plays a key role in improving the microstructure and mechanical properties. The grain refiners for A380 mainly are usually Al–Ti and Al–Ti–B master alloys.[4,5]
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