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铝合金轮毂在铸造成型过程中由于受其形状及模具成型工艺的制约,致使其在不同部位的微观组织、力学性能具有很大程度的差异。有效的晶粒细化可以同时提高强度和伸长率,并减少铸造凝固过程的缺陷。基于对晶粒细化机理的理解,开发出新型铝合金晶粒细化剂用于A356铝合金的晶粒细化。实验结果表明,与Al5Ti1B细化剂相比,新型晶粒细化剂可以更为有效的细化A356合金,使其晶粒尺寸由600μm下降至300μm。经T6处理后,有效细化后A356合金的强度比Al5Ti1B细化的合金提高了13%,伸长率提高了23%。
Due to its shape and mold forming process constraints, the alloy wheels have different degrees of microstructure and mechanical properties in different parts during the casting process. Effective grain refinement increases strength and elongation at the same time and reduces defects in the cast solidification process. Based on the understanding of grain refinement mechanism, a new type of aluminum alloy grain refiner was developed for the grain refinement of A356 aluminum alloy. The experimental results show that compared with Al5Ti1B refiner, the new grain refiner can refine A356 alloy more effectively and decrease its grain size from 600μm to 300μm. After T6 treatment, the strength of A356 alloy improved by 13% and the elongation increased by 23% compared with Al5Ti1B refined alloy.