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Grain Refinement of LC9 Alloy by Low-Power Ultrasonic Vibration Melt Treatment

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Abstract:

The influences of different preheating temperature of mold and treatment temperature on solidified structure of LC9 alloy were studied by low-power ultrasonic vibration melt-treatment. The results show that grain of LC9 alloy can be refined greatly by low-power ultrasonic vibration melt-treatment. The dendrite growth is restrained and the microstructure is changed from larger dendrite grains to dominant fine none-dendritic and globular grains. With the decrease of preheating temperature of mold, grain size decreases. The efficiency of grain refinement is better at low preheating temperature. With the increase of ultrasonic vibration temperature, grain size decreases firstly, then increases, and the turning point is 660 °C. At 640 °C, grain size of the alloy with US vibration treatment changes slightly compared with non US-treated alloy.

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Periodical:

Advanced Materials Research (Volumes 538-541)

Pages:

1267-1271

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.538-541.1267

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Online since:

June 2012

Authors:

Le Ping Chen, Yan Yan Han, Quan Zhou

Keywords:

LC9 Alloy, Melt Treatment, Ultrasonic

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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