Magnesium Thixotropic Structures Produced by Controlled Nucleation Method
Magnesium Thixotropic Structures Produced by Controlled Nucleation Method
2007年第S1期 页码：316-319
纸质出版日期：2007，
DOI：
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[1].Magnesium Thixotropic Structures Produced by Controlled Nucleation Method[J].特种铸造及有色合金,2007(S1):316-319.
Magnesium Thixotropic Structures Produced by Controlled Nucleation Method[J]. Special Casting & Nonferrous Alloys, 2007,(S1):316-319.
[1].Magnesium Thixotropic Structures Produced by Controlled Nucleation Method[J].特种铸造及有色合金,2007(S1):316-319.DOI：
Magnesium Thixotropic Structures Produced by Controlled Nucleation Method[J]. Special Casting & Nonferrous Alloys, 2007,(S1):316-319.DOI：
Magnesium Thixotropic Structures Produced by Controlled Nucleation Method
摘要
Controlled Nucleation Method （CNM） is applied to AZ91 magnesium alloy to produce thixotropic structure suitable for semisolid casting.Pouring temperature and cooling rate are the two important solidification conditions that can be used for microstructure control in CNM process.Both have a significant effect on the as-cast microstructure and therefore on semisolid microstructure.Low pouring temperature produces fine non-dendritic as-cast structure.After partial remelting and isothermal holding
it develops into a thixotropic structure.High pouring temperature leads to a coarse dendritic as-cast structure
which turns into an irregular solid network in semisolid state.High pouring temperature can combine with high cooling rate to achieve a thixotropic structure.
Abstract
Controlled Nucleation Method （CNM） is applied to AZ91 magnesium alloy to produce thixotropic structure suitable for semisolid casting.Pouring temperature and cooling rate are the two important solidification conditions that can be used for microstructure control in CNM process.Both have a significant effect on the as-cast microstructure and therefore on semisolid microstructure.Low pouring temperature produces fine non-dendritic as-cast structure.After partial remelting and isothermal holding
it develops into a thixotropic structure.High pouring temperature leads to a coarse dendritic as-cast structure
which turns into an irregular solid network in semisolid state.High pouring temperature can combine with high cooling rate to achieve a thixotropic structure.
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