Analysis of Fractures and Microstructures on Different Injection Speeds in High-Pressure Die-Casting Magnesium Alloy
Abstract: In this study, to clarify the unknown physical properties of the Mg-Al-Th-RE alloy, the relationship between the injection conditions and the internal porosities, and the mechanical properties exerted by the solidification microstructure was investigated. The obtained cast samples were...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | en |
| Published: |
Penerbit UTHM
2023
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| Subjects: | |
| Online Access: | http://ir.unimas.my/id/eprint/43540/3/Analysis.pdf http://ir.unimas.my/id/eprint/43540/ https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/14443 |
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| Summary: | Abstract: In this study, to clarify the unknown physical properties of the Mg-Al-Th-RE alloy, the relationship
between the injection conditions and the internal porosities, and the mechanical properties exerted by the
solidification microstructure was investigated. The obtained cast samples were investigated using X-ray CT
internal measurements, tensile tests, Vickers hardness tests, and solidification microstructure observations. The
tensile strength and the elongation at the injection speed of 5.0 m/s were higher than at 2.0 m/s. The number of
porosities affected the tensile strength and the elongation even at the same fracture position. In addition, it was
confirmed that segregation affected the destruction smaller the porosity size and the greater the variability of
porosity. As the injection speed increased, the amount of heat transferred between the molten metal and the wall
surface also increased, resulting in quick freezing and solidification. The tensile strength increased at the injection
speed of 5.0 m/s because the interface between the scattered primary crystals and eutectic systems was narrow. On
the other hand, at the injection speed of 2.0 m/s, the tensile strength decreased because the molten metal was
delayed in solidification and dendrite growth became remarkable. |
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