Microstructural characteristics and mechanical properties of Al-2024 alloy processed via a rheocasting route

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• 作者：Behnam Rahimi ; Hamed Khosravi…
• 关键词：aluminum alloys ; rheocasting ; microstructure ; mechanical properties
• 刊名：International Journal of Minerals, Metallurgy, and Materials
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：22
• 期：1
• 页码：59-67
• 全文大小：5,857 KB
• 参考文献：1. D.B. Spencer, R. Mehrabian, and M.C. Flemings, Rheological behavior of Sn-15 pct Pb in the crystallization range, / Metall. Trans., 3(1972), No. 7, p. 1925. CrossRef
  2. H.M. Guo, X.B. Liu, X.J. Yang, A.S. Zhang, and Y. Liu, Microstructure evolution behavior of AlSi₉Cu₃ alloy during rheocasting, / Trans. Nonferrous Met. Soc. China, 20(2010), p. 815. CrossRef
  3. H. Mirzadeh and B. Niroumand, Effects of rheocasting parameters on the microstructure of rheo-centrifuged cast Al-7.1wt%Si alloy, / J. Alloys Compd., 474(2009), No. 1-, p. 257. CrossRef
  4. P. Falak and B. Niroumand, Rheocasting of an Al-Si alloy, / Scripta Mater., 53(2005), No. 1, p. 53. CrossRef
  5. H. Nakato, M. Oka, S. Itoyama, M. Urata, T. Kawasaki, K. Hashiguchi, and S. Okano, Continuous semi-solid casting process for aluminum alloy billets, / Mater. Trans., 43(2002), No. 1, p. 24. CrossRef
  6. Z. Fan, X. Fang, and S. Ji, Microstructure and mechanical properties of rheo-diecast (RDC) aluminium alloys, / Mater. Sci. Eng. A, 412(2005), No. 1-, p. 298. CrossRef
  7. P.A. Joly and R. Mehrabian, The rheology of a partially solid alloy, / J. Mater. Sci., 11(1976), p. 1393. CrossRef
  8. M. Reisi and B. Niroumand, Effects of stirring parameters on rheocast structure of Al-7.1wt.%Si alloy, / J. Alloys Compd., 470(2009), p. 413. CrossRef
  9. B. Niroumand and K. Xia, 3D study of the structure of primary crystals in a rheocast Al-Cu alloy, / Mater. Sci. Eng. A, 283(2000), No. 1-, p. 70. CrossRef
  10. Z. Fan, Semisolid metal processing, / Int. Mater. Rev., 47(2002), No. 2, p. 49. CrossRef
  11. T. Haga and P. Kapranos, Thixoforming of laminate made from semisolid cast strips, / J. Mater. Process. Technol., 157-58(2004), p. 508. CrossRef
  12. A. Hekmat-Ardakan and F. Ajersch, Effect of conventional and rheocasting processes on microstructural characteristics of hypereutectic Al-Si-Cu-Mg alloy with variable Mg content, / J. Mater. Process. Technol., 210(2010), No. 5, p. 767. CrossRef
  13. P.K. Seo, D.U. Kim, and C.G. Kang, The characteristics of grain size controlled microstructure and mechanical properties of Al-Si alloy by thixocasting and rheocasting process, / J. Mater. Process. Technol., 162-63(2005), p. 570. CrossRef
  14. T. Haga and P. Kapranos, Simple rheocasting processes, / J. Mater. Process. Technol., 130-31(2002), p. 594. CrossRef
  15. Z.H. Bai, F. Qiu, X.X. Wu, Y.Y. Liu, and Q.C. Jiang, Age hardening and creep resistance of cast Al-Cu alloy modified by praseodymium, / Mater. Charact., 86(2013), p. 185. CrossRef
  16. A.K. Dey, P. Poddar, K.K. Singh, and K.L. Sahoo, Mechanical and wear properties of rheocast and conventional gravity die cast A356 alloy, / Mater. Sci. Eng. A, 435-36(2006), p. 521. CrossRef
  17. U.A. Curle, Semi-solid near-net shape rheocasting of heat treatable wrought aluminum alloys, / Trans. Nonferrous Met. Soc. China, 20(2010), No. 9, p. 1719.
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Materials Science
  Metallic Materials
  Mineral Resources
  
• 出版者：Journal Publishing Center of University of Science and Technology Beijing, in co-publication with Sp
• ISSN：1869-103X

文摘

This article reports the effects of stirring speed and T6 heat treatment on the microstructure and mechanical properties of Al-2024 alloy synthesized by a rheocasting process. There was a decrease in grain size of α-Al particles corresponding to an increase in stirring speed. By increasing the stirring speed, however, the globularity of matrix particles first increased and then declined. It was also found that the hardness, compressive strength, and compressive strain increased with the increase of stirring speed. Microstructural studies revealed the presence of nonsoluble Al15(CuFeMn)3Si2 phase in the vicinity of CuAl2 in the rheocast samples. The required time for the solution treatment stage was also influenced by stirring speed; the solution treatment time decreased with the increase in stirring speed. Furthermore, the rheocast samples required a longer homogenization period compared to conventionally wrought alloys. Improvements in hardness and compressive properties were observed after T6 heat treatment.