Effect of the new refiner Al-5Ti-1B-7Sm on the properties of 7050 alloy
s:This study investigates the effect of Al-5Ti-1B-7Sm refiner on the microstructure and mechanical properties of 7050 alloy.Experiments show that Al-5Ti-B-7Sm refiner is mainly composed of Ti2Al20Sm and TiB2 phases,and contains a very small amount of TiAl3.In 7050 alloy,the optimal amount of refiner added was 0.6%,the average grain size was reduced from 120.9μm before refinement to 66.9μm,and the ultimate tensile strength of cast alloy was increased from 120MPa to 141MPa.Fine-grain strengthening is the main reason why Al-5Ti-1B-7Sm refiner improves the strength of 7050 alloy.
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