| 双螺旋搅拌法制浆工艺参数对AZ91D合金半固态组织的影响 |
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| 引用本文： | 朱光磊,徐骏,张志峰,刘国钧.双螺旋搅拌法制浆工艺参数对AZ91D合金半固态组织的影响[J].稀有金属,2010,34(2). |
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| 作者姓名： | 朱光磊 徐骏 张志峰 刘国钧 |
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| 作者单位： | 北京有色金属研究总院国家有色金属复合材料工程技术研究中心,北京,100088 |
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| 摘 要： | 双螺旋搅拌工艺制备了AZ91D合金半固态浆料,获得金属半固态加工要求的细小、等轴分布均匀的非枝晶组织。研究了熔体温度、搅拌速度和剪切时间对该组织的影响规律。结果表明:采用合适的搅拌工艺,可获得金属半固态加工要求的细小、等轴分布均匀的非枝晶组织。即降低降体温度、搅拌速度及适当剪切时间有利于细小球形晶粒的形成。加大搅拌速度及合理搅拌时间可以细化晶粒,主要是由于是高剪切作用下熔体获得一个非常均匀温度场,从而增加有效形核的缘故。
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| 关 键 词： | AZ91D镁合金 半固态 搅拌工艺 |
Effects of Parameters of Slurry-Making Process with a Twin-Screw Stirring on Semisolid Microstructure of AZ91D Alloy |
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| Zhu Guanglei,Xu Jun,Zhang Zhifeng,Liu Guojun.Effects of Parameters of Slurry-Making Process with a Twin-Screw Stirring on Semisolid Microstructure of AZ91D Alloy[J].Chinese Journal of Rare Metals,2010,34(2). |
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| Authors: | Zhu Guanglei Xu Jun Zhang Zhifeng Liu Guojun |
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| Affiliation: | Zhu Guanglei,Xu Jun,Zhang Zhifeng,Liu Guojun(National Engineering , Technology Research Center for Non-Ferrous Metals Composites,General Research Institute for Non-Ferrous Metals,Beijing 100088,China) |
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| Abstract: | The AZ91D semisolid slurry was prepared by twin-screw stirring method. The influences of melt temperature, rotation speed and shearing time on the size and morphology of α-Mg were investigated. The results showed that fine equiaxed grain could be obtained by proper stirring process. The melt temperature, stirring speed and proper shearing time were beneficial to the formation of fine globular grains. Increasing the stirring speed and reasonable time could give rise to substantial grain refinement during shearing stage, which can be attributed to the increase of effective nucleation rate caused by the extremely uniform temperature due to a high shear rate and a high degree of turbulence. |
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| Keywords: | AZ91D Mg alloy semisolid stirring process |
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