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Effects of Secondary Dendrite Arm Spacing on Microporosity of A357 Alloy

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Abstract:

Microporosity in cast aluminum alloys formed during solidification of castings can be due to the evolution of dissolved hydrogen gas from the liquid metal, the inability of liquid metal to feed through interdendritic channels, or a combination of both. The secondary dendrite arm spacing (SDAS) of the casting may affect either the evolution of hydrogen gas or the ability of feeding. In this investigation, a method based on the Nearest-Neighbor-Distance (NND for short) cluster analysis of image analysis data was used for distinguishing the gas and shrinkage pores in A357 alloy, in order to study the effects of SDAS on the microporosity formation. It shows that the shrinkage pores are prone to form in the specimens with small SDAS. The discrete, isolated gas microporosity is prone to form in the specimens with large SDAS.

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Periodical:

Advanced Materials Research (Volumes 97-101)

Pages:

781-784

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.97-101.781

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Online since:

March 2010

Authors:

Yong Zhi Zou, Zheng Bin Xu, Jian Min Zeng

Keywords:

A357 Aluminum Alloy, Image Analysis, Microporosity, NND, Second Dendrite Arm Spacing (SDAS), Shrinkage

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© 2010 Trans Tech Publications Ltd. All Rights Reserved

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