作　　者： ; ; ;

机构地区： 湖南工业大学

出　　处： 《稀有金属材料与工程》 2009年第A01期353-356,共4页

摘　　要： 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。 The cooling rate of aluminum alloy powders prepared by ultrasonic gas atomization process was calculated through the convection heat transfer principle. A simple and theoretical model is established, which can be expressed as ｜dTd/dt｜=12/ρ·Cp（Td-Tf）·kg/d^2· The average cooling rates of A1-Ni-Ce-Fe-Cu alloy powders prepared by argon gas atomization and by helium gas atomization are about 10^4--10^7 K/s and 10^5-10^8 K/s, respectively. The critical cooling rate is calculated to be 3.74×10^5 K/s for Al-Ni-Ce-Fe-Cu alloy amorphous powders prepared by argon gas atomization. The cooling rates of gas-atomized powder particles estimated from secondary dendrite arm spacing are in consistence to those predicted from the theoretical model.

关 键 词： 气雾化 冷却速度 铝合金 非晶 二次枝晶

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]