Introduction
Bimonthly, started in 1957
Administrator
Shanxi Provincial Education Department
Sponsor
Taiyuan University of Technology
Publisher
Ed. Office of Journal of TYUT
Editor-in-Chief
SUN Hongbin
ISSN: 1007-9432
CN: 14-1220/N
Administrator
Shanxi Provincial Education Department
Sponsor
Taiyuan University of Technology
Publisher
Ed. Office of Journal of TYUT
Editor-in-Chief
SUN Hongbin
ISSN: 1007-9432
CN: 14-1220/N
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Effect of Al-5Ti-1B and Y on Casting Mg-5Al-5Si Alloy
DOI:
10.16355/j.tyut.1007-9432.20230268
Received:
Accepted:
| Corresponding author | Institute | |
| FAN Jinping | College of Materials Science and Engineering, Taiyuan University of Technology |
abstract:
【Purposes
】In order to refine the coarse Mg2Si phase in Mg-Al-Si alloy, the Mg-5Al-5Si alloys are modified by adding Al-5Ti-1B and rare earth Y.【Methods】The Mg-Al-Si alloys with different compositions were prepared by smelting. Various means were used to analyze the composition, microstructure, and mechanical properties of alloys before and after modification, and discuss modification mechanism.【Findings】The results show that, adding Al-5Ti-1B to the Mg-5Al-5Si alloy transforms the morphology of the primary phase from coarse bulk to fine dendritic or polygon, the number of eutectic phases decreases with the increase of Al-5Ti-1B, while the hardness of the alloys increases significantly, which is attributed to TiB2phase acting as the heterogeneous nucleation sites for primary Mg2Si phase. On the foundation of adding 1.0% Al-5Ti-1B, rare earth Y can further modify the size and morphology of Mg2Si. When 1.0% Al-5Ti-1B and 1.0% Y are added together, the average size of the primary Mg2Si is decreased to 10.2μm, the morphology of primary Mg2Si is fine polygonal, and the alloy has the best tensile mechanical properties, with the modification mechanism of rare earth Y mainly adsorption and poisoning.
Keywords:
Mg-Al-Si alloy; Mg2Si; microstructure; mechanical properties;