| 气雾化制备非平衡态铝合金粉末冷却速度的计算(英文) |
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| 引用本文： | 何世文,刘咏,郭晟. 气雾化制备非平衡态铝合金粉末冷却速度的计算(英文)[J]. 稀有金属材料与工程, 2009, 38(Z1) |
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| 作者姓名： | 何世文 刘咏 郭晟 |
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| 作者单位： | 1. 湖南工业大学,湖南,株洲,412000;中南大学,粉末冶金国家重点实验室,湖南,长沙,410083
2. 中南大学,粉末冶金国家重点实验室,湖南,长沙,410083 |
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| 基金项目： | Project supported by the National Advanced Materials Committee of P. R. China (2003AA302520) |
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| 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|dTd/dt|=12/p·Cp·(Td-Tf)·kg/d2.根据理论公式,氩气和氦气雾化制备铝合金粉的冷却速度分别为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.对于氩气雾化制各Al-NiCe-Fe-Cu合金而言,获得非晶态粉末其临界冷却速度为3.74×109K/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.
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| 关 键 词： | 气雾化 冷却速度 铝合金 非晶 二次枝晶 |
Cooling Rate Calculation of Non-Equilibrium Aluminum Alloy Powders Prepared by Gas Atomization |
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| He Shiwen,Liu Yong,Guo Sheng. Cooling Rate Calculation of Non-Equilibrium Aluminum Alloy Powders Prepared by Gas Atomization[J]. Rare Metal Materials and Engineering, 2009, 38(Z1) |
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| Authors: | He Shiwen Liu Yong Guo Sheng |
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| Affiliation: | He Shiwen1,2,Liu Yong2,Guo Sheng2 (1. Hunan University of Technology,Zhuzhou 412000,China) (2. State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China) |
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| Abstract: | 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/d2.The average cooling rates of Al-Ni-Ce-Fe-Cu alloy powders prepared by argon gas atomization and by helium gas atomization are about 104～107 K/s and 105～108 K/s,respectively.The critical cooling rate is calculated to be 3.74× 105 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. |
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| Keywords: | gas atomization cooling rate aluminum alloy amorphous secondary dendrite arm spacing |
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