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Effects of Cooling Rate on Solidification Microstructure of ZK60 Magnesium Alloy

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Abstract:

In this paper, the influence of the cooling rate on the solidified structure of ZK60 Mg alloy has been studied by means of Gleeble-1500D thermal simulation instrument. The result showed that the grain size and grain shape depended on the cooling rate, Primary Dendrite Arm Space ( λI ) and Secondary Dendrite Arm Space ( λII) sharply decreased with the increasing of solidifying cooling rate (v) in the range of experimental cooling rate (0.2~100K/s). When superheat was constant, the empirical formulas of the relation between λI λII and v was obtained. In addition, the dependence between micro-hardness (HV) and Secondary Dendrite Arm Space ( λII) for ZK60 casting alloy was proved to be similar with Hall-Petch formula. The empirical formula for λII-HV has been proposed.

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Periodical:

Materials Science Forum (Volumes 488-489)

Pages:

295-298

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.488-489.295

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Online since:

July 2005

Authors:

Chun Mei Yang, Ding Fei Zhang, Pei Dao Ding, Jian Peng, Xu Hong Chen

Keywords:

Cooling Rate, Dendrite Arm Space, Microhardness, ZK60 Magnesium Alloy

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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