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- Title
The Effect of Bi Element Addition on Bimodal Structure Transformation in Al-Cu-Si Ternary Eutectic Alloy.
- Authors
BO Haiwa; TANG Ling; WANG Yongshan
- Abstract
To reveal the influence and mechanism of Bi elements with different amount m eutectic phase on the undercooled eutectic solidification structure, Al-Cu-Si-xBi (x = 0%, 0.01%, 0.03%, 0.05%, 0.07%) eutectic alloys were prepared via using a gravity solidified method. The effect of Bi on the solidification structure of Al-Cu-Si ternery eutectic alloy was investigated. The results show that the Al-Cu-Si ternary eutectic alloy has α-Al/ θ-Al2Cu binary eutectic and α-Al/θ-Al2Cu/β-Si ternary eutectic. The structure is called a bimodal eutectic structure. When Bi is not added, the α-Al/θ-Al2Cu binary eutectic exhibits a typical radial chrysanthemum cluster morphology, the Si phase in α-Al/θ-Al2Cu/β-Si ternary eutectic exhibits elongated needle like morphology. The bimodal eutectic structure is relatively inhomogeneous. With the addition of Bi, α-Al/θ-Al2Cu binary eutectic exhibits a uniform and line short layer structure, and the Si phase in α-Al/θ-Al2Cu/β-Si ternary eutectic exhibits dot needle--like morphology. The difference n interlayer spacing of the bimodal eutectic structure gradually decreases. When the amount of Bi added is 0. 05%, the modification effect is the optimal, and the bimodal eutectic structure is the most uniform and fine, alloy hardness is optimal.
- Subjects
EUTECTIC alloys; EUTECTIC structure; TERNARY alloys; BINARY metallic systems; SOLIDIFICATION; CHRYSANTHEMUMS
- Publication
Nonferrous Metals Engineering, 2024, Vol 14, Issue 2, p24
- ISSN
2095-1744
- Publication type
Article
- DOI
10.3969/j.issn.2095-1744.2024.02.004