Effect of Modification on Microstructure and Properties of AZ91 Magnesium Alloy
Refinement of α-Mg solid solution grains has a significant influence on the improvement of mechanical properties of cast magnesium alloys. In the article, the effects of three modifiers on microstructure and properties of AZ91 magnesium alloy casted to a sand mould were described. Overheating, hexac...
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| Published in: | Crystals (Basel) Vol. 10; no. 6; p. 536 |
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| Main Authors: | , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
MDPI AG
01-06-2020
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| Subjects: | |
| Online Access: | Get full text |
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| Summary: | Refinement of α-Mg solid solution grains has a significant influence on the improvement of mechanical properties of cast magnesium alloys. In the article, the effects of three modifiers on microstructure and properties of AZ91 magnesium alloy casted to a sand mould were described. Overheating, hexachloroethane and wax-CaF2-carbon powder were applied. The research procedure comprised microstructure analysis by means of light microscopy, scanning electron microscopy and quantitative analysis with AnalySIS Pro® software and mechanical properties’ investigation. The microstructure of AZ91 alloy in the as-cast condition consists of α-Mg solid solution with precipitates of Mg17Al12, Mg2Si and Al8Mn5 phases. It was reported that all applied modifiers cause refinement of α-Mg solid solution grains and a decrease of the volume fraction of α-Mg+Mg17Al12 compound discontinuous precipitates. The best results were obtained in the case of wax-CaF2-carbon powder. |
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| ISSN: | 2073-4352 2073-4352 |
| DOI: | 10.3390/cryst10060536 |