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Effect of Heat Treatment on Morphology of Fe-Rich Intermetallics in Hypereutectic Al-Si-Cu-Ni Alloy with 1.26 pct Fe

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Abstract

Cobalt is generally considered as the element that can neutralize the negative effects of iron in Al alloys, such as inducing fracture and failure for stress concentration. Nevertheless, Fe-rich intermetallics would be inclined to form coarse plate-like δ-Al4(Fe, Co, Ni)Si2 particles when the content of Fe was high, which could also cause inferior mechanical properties. The dissolution and transformation of δ-Al4(Fe, Co, Ni)Si2 phase in solution heat-treated samples of Al-20Si-1.85Cu-1.05Ni-1.26Fe-1.35Co alloy were studied using optical microscopy, image analysis, and scanning electron microscopy. The effects of solution heat treatment time ranging from 0 to 9 hours at 783.15 K (510 °C) on mechanical properties were also investigated. The coarse plate-like δ-Al4(Fe, Co, Ni)Si2 particles varied slowly through concurrent dissolution along widths and at the plate tips as solution treatment time increased, which could be explained from diffusion-induced grain boundary migration. Solution heat treatment also has an important influence on mechanical properties. The maximum ultimate tensile strength and yield strength after T6 treatment were 258 and 132 MPa, respectively, while the maximum hardness was 131 HB. Compared with those of the samples in the as-cast state, they increased by 53, 42, and 28 pct, respectively. Moreover, δ-Al4(Fe, Co, Ni)Si2 phase, which appears as a coarse plate-like particle in two dimensions, is actually a cuboid in three dimensions. The length of this cuboid is close to the width, while the height is much smaller.

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Acknowledgments

This work was funded by Project 2012CB616900 supported by the National Basic Research Program of China (973 Program) and Project 51275183 supported by the National Natural Science Foundation of China. The authors would also like to express their appreciation to the Analytical and Testing Center, HUST.

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Authors and Affiliations

  1. State Key Lab of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Luoyu Road 1037#, Wuhan, 430074, People’s Republic of China

    Meng Sha (Ph.D. Candidate), Shusen Wu (Professor), Li Wan (Associate Professor) & Shulin Lü (Post Doctorate)

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  1. Meng Sha
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  2. Shusen Wu
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  3. Li Wan
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  4. Shulin Lü
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Correspondence to Shusen Wu.

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Manuscript submitted February 2, 2013.

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Sha, M., Wu, S., Wan, L. et al. Effect of Heat Treatment on Morphology of Fe-Rich Intermetallics in Hypereutectic Al-Si-Cu-Ni Alloy with 1.26 pct Fe. Metall Mater Trans A 44, 5642–5652 (2013). https://doi.org/10.1007/s11661-013-1937-y

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