However, the second dendrite arm spacing (SDAS) changes little.
二次枝晶臂间距变化不明显。
Dendrite arm spacings is one of the important as-cast structural parameters.
枝晶间距是重要的铸态组织参数。
When the boron content is high and the cooling rate is relatively low, boride can exist at the dendrite arm.
当硼含量较高、冷却速度较慢时，硼化物存在于枝晶干。
The effect of counter-pressure casting parameters on secondary dendrite arm spacing (SDAS)of A357 alloy was studied.
研究了差压铸造不同工艺参数对A357合金二次枝晶间距的影响。
The quantitative relationship between secondary dendrite arm spacing and solidification cooling rate of AZ91 was obtained by regressive analysis.
用数学回归的方法得到了AZ91镁合金的凝固冷却速度与二次枝晶间距的定量关系式。
The results show that the grain average size and the primary and secondary dendrite arm space were obviously reduced with the increase of cooling rate.
结合实验和模拟结果，得出该合金的晶粒尺寸、一次枝晶间距、二次枝晶臂间距随冷却速率增大而明显减小。
It's an effective method to obtain reasonable solidification structure by computing temperature field and the secondary dendrite arm spacing using mathematical model.
通过数学模拟计算凝固过程的温度场，进而计算二次枝晶间距是获得合理凝固组织的有效手段。
It's an effective method to obtain reasonable solidification structure by computing temperature field and the secondary dendrite arm spacing using mathematical model.
通过数学模拟计算凝固过程的温度场，进而计算二次枝晶间距是获得合理凝固组织的有效手段。
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