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- Title
Effect of slow shot speed on externally solidified crystal, porosity and tensile property in a newly developed high-pressure die-cast Al-Si alloy.
- Authors
Wen-ning Liu; Wei Zhang; Peng-yue Wang; Yi-xian Liu; Xiang-yi Jiao; Ao-xiang Wan; Cheng-gang Wang; Guo-dong Tong; Shou-mei Xiong
- Abstract
The effect of slow shot speed on externally solidified crystal (ESC), porosity and tensile property in a newly developed high-pressure die-cast Al-Si alloy was investigated by optical microscopy (OM), scanning electron microscopy (SEM) and laboratory computed tomography (CT). Results showed that the newly developed AlSi9MnMoV alloy exhibited improved mechanical properties when compared to the AlSi10MnMg alloy. The AlSi9MnMoV alloy, which was designed with trace multicomponent additions, displays a notable grain refining effect in comparison to the AlSi10MnMg alloy. Refining elements Ti, Zr, V, Nb, B promote heterogeneous nucleation and reduce the grain size of primary a-Al. At a lower slow shot speed, the large ESCs are easier to form and gather, developing into the dendrite net and net-shrinkage. With an increase in slow shot speed, the size and number of ESCs and porosities significantly reduce. In addition, the distribution of ESCs is more dispersed and the net-shrinkage disappears. The tensile property is greatly improved by adopting a higher slow shot speed. The ultimate tensile strength is enhanced from 260.31 MPa to 290.31 MPa (increased by 11.52%), and the elongation is enhanced from 3.72% to 6.34% (increased by 70.52%).
- Subjects
TENSILE strength; DIE-casting; POROSITY; ALLOYS; HYPOEUTECTIC alloys
- Publication
China Foundry, 2024, Vol 21, Issue 1, p11
- ISSN
1672-6421
- Publication type
Article
- DOI
10.1007/s41230-023-3037-y