超声-机械振动复合处理细化AZ91D-3Ca镁合金的凝固组织

付浩; 周全; 脱宏超; 谭水淋; 谢小华

doi:10.15980/j.tzzz.2013.11.012

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超声-机械振动复合处理细化AZ91D-3Ca镁合金的凝固组织
Microstructure Refinement of AZ91D-3Ca Alloy by Compound Treatment of Ultrasonic and Mechanical Vibration
2013年33卷第11期页码：1066-1070
纸质出版日期： 2013 ，
DOI： 10.15980/j.tzzz.2013.11.012

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[1]付浩,周全,脱宏超,谭水淋,谢小华.超声-机械振动复合处理细化AZ91D-3Ca镁合金的凝固组织[J].特种铸造及有色合金,2013,33(11):1066-1070.

Fu Hao, Zhou Quan, Tuo Hongchao, et al. Microstructure Refinement of AZ91D-3Ca Alloy by Compound Treatment of Ultrasonic and Mechanical Vibration[J]. Special Casting & Nonferrous Alloys, 2013,33(11):1066-1070.
[1]付浩,周全,脱宏超,谭水淋,谢小华.超声-机械振动复合处理细化AZ91D-3Ca镁合金的凝固组织[J].特种铸造及有色合金,2013,33(11):1066-1070. DOI： 10.15980/j.tzzz.2013.11.012.

Fu Hao, Zhou Quan, Tuo Hongchao, et al. Microstructure Refinement of AZ91D-3Ca Alloy by Compound Treatment of Ultrasonic and Mechanical Vibration[J]. Special Casting & Nonferrous Alloys, 2013,33(11):1066-1070. DOI： 10.15980/j.tzzz.2013.11.012.

摘要

对比研究了未处理、机械振动处理、超声熔体处理及超声-机械振动复合处理条件下AZ91D-3Ca镁合金的凝固组织

同时考察了复合处理条件下浇注温度和铸型预热温度对合金凝固组织的影响。结果表明

超声-机械振动复合处理可以显著细化AZ91D-3Ca镁合金的初生晶粒

其细化效果好于单一的机械振动或超声处理;复合处理后

合金的第二相弥散分布在晶界处

呈条状或颗粒状

其抗拉强度和伸长率分别提高了79.67%和35.71%。在610

00℃范围内

复合处理在不同的浇注温度下均有明显的细化效果

但浇注温度的变化对细化效果影响不明显。在20

00℃范围内

随着铸型预热温度升高

复合处理后合金的初生晶粒由不完整的树枝晶逐渐退化成为等轴晶或蔷薇状晶

且有所粗化。

Abstract

Microstructures of the alloy without treatment

treated by mechanical vibration

ultrasonic and by compound action of ultrasonic and mechanical vibration were investigated comparatively.Influences of pouring temperature and preheating temperature of mold on solidification structure of the alloy after compound treatment of ultrasonic and mechanical vibration were expounded.The results show that primary grain in magnesium alloy AZ91D-3Ca can be refined significantly by compound treatment of ultrasonic and mechanical vibration

which is apparently superior to mechanical vibration treatment or melttreatment by ultrasonic.The second phases with short strips or granular are distributed uniformly at grain boundary

and tensile strength and elongation of the alloy with compound treatment are increased by 79.67%and by 35.71%

respectively.When pouringt temperature is in range of 610

00℃

obvious refining effect can be observed at different pouring temperature

however change of microstructure refinement is independent on change of pouring temperature.With the increase of preheating temperature of the mold from 20℃to 600℃

primary phase is converted from incomplete dendrite to equiaxed or rossette-shaped crystal with slight coarseness.