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本文研究了冷却速度和钛、硼、钒、锆对Al-5.0Cu-0.8Mn合金晶粒尺寸和二次枝晶间距的影响。提高冷却速度减小了二次枝晶间距,在相同冷却条件下,加入钛、硼、钒、锆等细化元素后,由于其对枝晶生长的抑制作用,缩小了液固界面前沿的溶质富集区,明显地细化晶粒尺寸和二次枝晶间距;而且,降低了合金的二次枝品间距对冷却速度的敏感性。
In this paper, the effects of cooling rate and Ti, B, V and Zr on the grain size and secondary dendrite spacing of Al-5.0Cu-0.8Mn alloy have been investigated. Increasing the cooling rate reduced the secondary dendrite spacing. Under the same cooling conditions, the addition of the refined elements such as titanium, boron, vanadium and zirconium reduced the solute at the front of the liquid-solid interface due to its inhibitory effect on dendrite growth Enrichment zone, the grain size and secondary dendrite spacing are obviously refined; moreover, the sensitivity of the secondary dendrite spacing to the cooling rate is reduced.