The Relationship between MnS Precipitation and Induced Nucleation Effect of Mg-Bearing Inclusion

The relationship between MnS precipitation and induced nucleation effect of Mg-bearing inclusion has been explored through scanning electron microscope and energy dispersive spectrometer (EDS). Results indicate that MnS prefers to precipitate on Mg-bearing inclusions. Statistical analysis suggests t...

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Bibliographic Details
Published in:High temperature materials and processes 2018-09, Vol.37 (8), p.711-716
Main Authors: Xiangshen, Tian, Longfei, Zhu, ZhengYu, Cai, Hui, Kong
Format: Article
Language:English
Subjects:
81.30.Mh
Aluminum
Bearing
Crystal structure
grain refinement
Inclusions
intragranular acicular ferrite
Lattice vacancies
Magnesium
Manganese
Nucleation
oxide metallurgy
Silicon
Statistical analysis
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Summary:The relationship between MnS precipitation and induced nucleation effect of Mg-bearing inclusion has been explored through scanning electron microscope and energy dispersive spectrometer (EDS). Results indicate that MnS prefers to precipitate on Mg-bearing inclusions. Statistical analysis suggests that MgAl and MgO may coexist in inclusion. After etching, it is found that Mg-bearing inclusions can induce the nucleation of intragranular acicular ferrites. Based on EDS line analysis and comparison with Al-Mn-Si-O inclusion in non-Mg-treated sample, this effect can be explained by Mn-depletion zone (MDZ), which is due to the vacancy property and crystal structure of MgAl . In the same sample, similar induced nucleation effect and MDZ are not observed around pure MnS. This comparison implies that the formation of MDZ may be independent of MnS precipitation.
ISSN:0334-6455
2191-0324
DOI:10.1515/htmp-2016-0259