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China Foundry

, Volume 15, Issue 2, pp 117–123 | Cite as

Synergistic effects of composition and heat treatment on microstructure and properties of vacuum die cast Al-Si-Mg-Mn alloys

  • Jun-jie Xu
  • Ye PanEmail author
  • Tao Lu
  • Bing Bo
Research & Development
First Online:
  • 68 Downloads

Abstract

The purpose of this study was to prepare high-quality Al-Si-Mg-Mn alloy with a good combination of strength and ductility employing the vacuum-assisted high-pressure die cast process. An orthogonal study of heat treatments was conducted to design an optimized T6 heat treatment process for both AI-10%Si-0.3%Mg-Mn and AI-11%Si-0.6%Mg-Mn alloys. The results demonstrate that no obvious blisters and warpage were observed in these two alloys with solid solution treatment. After the optimal T6 heat treatment of 530°Cx3h + 165°Cx6h, AI-11%Si-0.6%Mg-Mn alloy has better mechanical properties, of which tensile strength, yield strength and elongation reached 377.3 MPa, 307.8 MPa and 9%, respectively. The improvement of mechanical properties can be attributed to the high density of needle-like β"(Mg5Si6) precipitation after aging treatment and the fine and spherical eutectic Si particles uniformly distributed in the α-AI matrix.

Keywords

heat treatment vacuum die casting Al-Si-Mg-Mn alloy microstructure mechanical properties 

Document Code

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References

  1. [1]
    Shivkumar S, Ricci S, Keller C, et al. Effect of solution treatment parameters on tensile properties of cast aluminum alloys. Journal of Heat Treating, 1990, 8(1): 63–70.CrossRefGoogle Scholar
  2. [2]
    Lumley R N, Polmear I J, Curtis P R. Rapid heat treatment of aluminum high-pressure diecastings. Metallurgical & Materials Transactions A, 2009, 40(7): 1716–1726.CrossRefGoogle Scholar
  3. [3]
    Srivastava M C, Lohne O. Effects of heat treatment on the microstructure and mechanical properties of ductile AISi9MgMn die castings. International Journal of Metalcasting, 2016,10(4): 556–565.CrossRefGoogle Scholar
  4. [4]
    Lumley R N, Odonnell R G, Gunasegaram D R, et al. Heat treatment of high-pressure die castings. Metallurgical & Materials Transactions A, 2007, 38(10): 2564–2574.CrossRefGoogle Scholar
  5. [5]
    Kasprzak W, Chen D L, Shaha S K. Heat treatment development for a rapidly solidified heat resistant cast Al-Si alloy. Journal of Materials Engineering & Performance, 2013, 22(7): 1839–1847.CrossRefGoogle Scholar
  6. [6]
    Ammar H R, Moreau C, Samuel A M, et al. Influences of alloying elements, solution treatment time and quenching media on quality indices of 413-type Al-Si casting alloys. Materials Science & Engineering A, 2008, 489(1-2): 426–438.CrossRefGoogle Scholar
  7. [7]
    Otarawanna S, Gourlay C M, Laukli H I, et al. Microstructure formation in AlSi4MgMn and AlMg5Si2Mn high-pressure die castings. Metallurgical and Materials Transactions A, 2009, 40(7): 1645–1659.CrossRefGoogle Scholar
  8. [8]
    Jacobs M H. The structure of the metastable precipitates formed during ageing of an Al-Mg-Si alloy. Philosophical Magazine A, 1972, 26(1): 1–13.CrossRefGoogle Scholar
  9. [9]
    Matsuda K, Ikeno S, Gamada H, et al. High-resolution electron microscopy on the structure of Guinier-Preston zones in an AI-1.6 mass Pet Mg2Si alloy. Metallurgical and Materials Transactions A, 1998, 29(4): 1161–1167.CrossRefGoogle Scholar
  10. [10]
    Ravi C, Wolverton C. First-principles study of crystal structure and stability of AI-Mg-Si-(Cu) precipitates. Acta Materialia, 2004, 52(14): 4213–4227.CrossRefGoogle Scholar
  11. [11]
    Chen Jianghua, Costan E, van Huis M A, et al. Atomic pillarbased nanoprecipitates strengthen AIMgSi alloys. Science, 2006, 312(5772): 416.CrossRefGoogle Scholar
  12. [12]
    Vissers R, Huis M A V, Jansen J, et al. The crystal structure of the β' phase in Al-Mg-Si alloys. Acta Materialia, 2007, 55(11): 3815–3823.CrossRefGoogle Scholar
  13. [13]
    Zandbergen H W, Andersen S J, Jansen J. Structure Determination of Mg5Si6 Particles in Al by Dynamic Electron Diffraction Studies. Science, 1997, 277(5330): 1221–1225.CrossRefGoogle Scholar
  14. [14]
    Andersen S J, Zandbergen H W, Jansen J, et al. The crystal structure of the beta" phase in Al-Mg-Si alloys. Acta Materialia, 2007, 46(2): 3283–3298.Google Scholar
  15. [15]
    Li Kai, Béché A, Song Min, et al. Atomistic structure of Cucontaining β" precipitates in an Al-Mg-Si-Cu alloy. Scripta Materialia, 2014, 75: 86–89.CrossRefGoogle Scholar
  16. [16]
    Li Runxia, Li Rongde, Zhao Yuhua, et al. Age-hardening behavior of cast Al-Si base alloy. Materials Letters, 2004, 58(15): 2096–2101.CrossRefGoogle Scholar

Copyright information

© Foundry Journal Agency and Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  1. 1.School of Materials Science and Engineering, Southeast UniversityJiangsu Key Laboratory for Advanced Metallic MaterialsNanjingChina

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