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| Effect of Fine-grained Al-Sr Master Alloy on Microstructure and Properties of AZ91D |
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Received:August 05, 2016
Revised:August 20, 2016
Accepted:August 22, 2016
Published Online:November 17, 2016
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| DOI：doi：10.3969/j.issn.1007-7545.2016.12.015 |
| KeyWord:copper mold inject casting; grain refining; Al-Sr; modification; AZ91D |
| Author | Institution |
| Dong Tian-shun |
河北工业大学材料科学与工程学院 |
| Wang Tuo |
河北工业大学材料科学与工程学院 |
| Liu Jin-hai |
河北工业大学材料科学与工程学院 |
| Li Guo-lu |
河北工业大学材料科学与工程学院 |
| Zhou Xiu-kai |
河北工业大学材料科学与工程学院 |
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| Abstract: |
| Copper mold inject casting was applied to treat Al-Sr intermediate alloy in vacuum induction furnace to produce fine-grained Al-Sr modificator. AZ91D was modified by coarse and fined grain Al-Sr respectively. The results of SEM, OM, XRD, test of tensile and hardness indicate that average size of second phase Al4Sr decreases from 100 μm to 5 μm after copper mold inject casting, and grain sizes of AZ91D metamorphosed by two kinds of Al-Sr are obviously thinner than those of molten AZ91D as well as Vickers hardness. Meanwhile, the effect of fine grain Al-Sr is better than that of coarse grain Al-Sr. Therefore, copper mold inject casting is an effective way to improve Al-Sr modification effect. |
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