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依据对流换热原理,对超音速气体雾化非平衡态铝合金粉末的冷却速度进行了理论计算。获得了一个较简单的理论计算公式,其表达式为︱dT/dt︱=12/p·cp·(Td-Tf)kg/d2根据理论公式,氩气和氦气气雾化制备铝合金粉末的冷却速度分别为104～107和105～108K/s,其结果与前期科研者的计算结果相符,且计算公式更简化。对于氩气雾化制备Al-Ni-Ce-Fe-Cu合金而言,获得非晶态粉末其临界冷却速度为3.74×105K/s。通过测定合金晶态粉末的二次枝晶臂间距,并利用冷却速度和枝晶臂间距之间的经验关系,验算了合金粉末的冷却速度,其结果与理论计算相吻合。
Based on the principle of convection heat transfer, the cooling rate of supersonic gas atomized non-equilibrium aluminum alloy powder was theoretically calculated. A simpler theoretical calculation formula is obtained, which is expressed as ︱dT / dt︱ = 12 / p · cp · (Td-Tf) kg / d2. According to the theoretical formula, an aluminum alloy powder is prepared by atomizing argon and helium The cooling rates are 104 ~ 107 and 105 ~ 108K / s, respectively. The results are in good agreement with those of previous researchers and the calculation formula is more simplified. For argon atomized Al-Ni-Ce-Fe-Cu alloy, the critical cooling rate of amorphous powder was 3.74 × 105K / s. The cooling rate and the interdendritic arm spacing were used to test the cooling rate of the alloy powder by measuring the secondary dendritic arm spacing of the alloy crystalline powder. The result is in good agreement with the theoretical calculation.