| Autor: |
Adi Ganda Putra, Azwar Manaf, Djoko Hadi Prajitno |
| Jazyk: |
angličtina |
| Rok vydání: |
2022 |
| Předmět: |
|
| Zdroj: |
Journal of Materials Research and Technology, Vol 19, Iss , Pp 643-652 (2022) |
| Druh dokumentu: |
article |
| ISSN: |
2238-7854 |
| DOI: |
10.1016/j.jmrt.2022.05.031 |
| Popis: |
Magnesium-based materials are lightweight materials that are 60% lighter in weight than steel, but the strength of these materials must be increased. This study was conducted on the effects of various Ca addition in (90-x)Mg–9Al–Zn-xCa (x = 0.0, 1.0, 1.5 and 2.0 wt.%) alloy samples made by casting and thixoforming processes. The alloy with x = 1.0 wt.% Ca yielded the microstructure consisting of α-Mg and β-Mg17Al12 with the mass fraction 83.1% and 16.9% respectively. The mass fraction α-Mg decreased to 50.3% and that of after β-Mg17Al12 increased to 49.7% after the thixoforming process. The increase in the mass fraction of the β-Mg17Al12 phase was caused by the heating process and the suppression force and the occurrence of grain refinement caused by the addition of Ca, which played a role in increasing hardness. The added Ca is an element that supports grain refinement and the formation of Al2Ca intermetallic compounds and reduces the growth of the β-Mg17Al12 phase. The hardness of the as-cast sample was originally 68 HB and increased to 82 HB. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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