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Microstructure Evolution Characteristic and Control of Iron-Rich Phase in Hypereutectic Al–Si Alloy with Co, Mn and P

  • STRUCTURE, PHASE TRANSFORMATIONS, AND DIFFUSION
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Abstract

In this paper, the microstructure evolutions and control of iron-rich phases in hypereutectic Al‒Si with the composite addition of Co, Mn and P were studied. Firstly, it was observed that Fe-rich compounds in series of Al–20Si–2Fe–xCo alloys (x = 1, 2, 3, and 4 wt %) were effectively promoted to transform from long needle-like β-Al5FeSi and coarse plate–like δ-Al4(Fe,Co)Si2 phases to dendritic α‑Al(Fe,Co,Mn)Si phases. The aspect ratio of Fe-rich particles has been reduced from 22.5 to 12.5 with the addition of Co was 3 wt %. Through the complex modification of Co and Mn, the precipitation of α-Al(Fe,Co,Mn)Si phases in types of Al–20Si–2Fe–3Co–yMn samples was further improved. Cooperating with the effective modification of Co and Mn on Fe-rich particles and the refinement of P element on primary Si, the microstructure of experimental alloys was further optimized. In comparison with basic alloy, the Brinell hardness of Al–20Si–2Fe–3Co–2Mn–0.03P alloy was significantly improved as high as 131 HB, reaching by 61.7%.

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Funding

The authors gratefully acknowledge the supports of National Science Foundation of Shandong Province (ZR2019MEM019), National Natural Science Foundations of China (51772132), Shandong Province Higher Educational Youths Innovative Science and Technology Program (2019KJA018) and the leaders of Scientific Research Studio Programs of Jinan (nos. 2021GXRC082 and 2021GXRC076).

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Authors and Affiliations

  1. School of Materials Science and Engineering, University of Jinan, 250022, Jinan, China

    Wenli Xia, Min Zuo, Yongli Li, Tongtong Liu, Yan Ju, Xinglong Wang & Degang Zhao

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  1. Wenli Xia
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  2. Min Zuo
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  3. Yongli Li
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  4. Tongtong Liu
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The authors Wenli Xia and Min Zuo contributed equally to this work.

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Correspondence to Min Zuo or Degang Zhao.

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Wenli Xia, Zuo, M., Li, Y. et al. Microstructure Evolution Characteristic and Control of Iron-Rich Phase in Hypereutectic Al–Si Alloy with Co, Mn and P. Phys. Metals Metallogr. 123, 1361–1368 (2022). https://doi.org/10.1134/S0031918X2210009X

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