Al-5Ti-1B细化剂对7A04铝合金半固态凝固组织的影响

Effects of Al-5Ti-1B grain refiner on microstructure of semisolid solidification of 7A04 aluminum alloy

摘要:

本文研究了Al-5Ti-1B细化剂的不同添加量对7A04铝合金半固态浆料组织及二次凝固组织的影响。结果表明：添加0.1%的Al-5Ti-1B细化剂可以明显细化和圆整化7A04铝合金半固态浆料的初生α-Al颗粒,在630℃下,其平均颗粒直径和圆整度分别为71μm和0.49；随着Al-5Ti-1B细化剂含量高于0.1%,细化效果增加不明显；随温度升高,颗粒尺寸减小但圆整度也变差；添加Al-5Ti-1B细化剂可以使7A04铝合金半固态凝固组织中的α₂颗粒细化并圆整,但对α₃颗粒的直径与圆整度无明显影响。

Abstract:

The effects of different amount of Al-5Ti-1B grain refiner on microstructure and secondary solidification of 7A04 aluminum alloy semisolid slurry were investigated. The results show that the primary α-Al particles of 7A04 aluminum alloy semisolid slurry could become fine and globular by addition of 0.1% Al-5Ti-1B grain refiner, the microstructure with average particle diameter 71μm and shape factor 0.49 of primary α-Al particles at 630℃could be obtained.The amount of Al-5Ti-1B grain refiner was higher than 0.1% and the effect of refining was not obvious. As the temperature increased, microstructure of semisolid slurry of 7A04 aluminum alloy got fine but the shape factor deteriorated. The microstructure of semisolid solidification with fine and globular α₂ particles could be achieved by addition of Al-5Ti-1B grain refiner, but there was little change with average particle diameter and shape factor of α₃ particles.