Microstructural Control of Al/Si Composites by Area-Selectively Liquid-Phase-Sintering Method

Abstract:

Area-selectively liquid-phase sintering (AS-LPS) method was developed to control the coarsening of Si particles in Al/60vol.% Si composites with the help of sol-gel-derived interfacial modification, achieved by pre-coating discontinuous Al₂O₃ film on Si powders. The results show that due to the local presence of less than 1 μm-thick films, Si particles can approximately preserve their as-received size and morphology after being sintered at 950 °C. Whereas, for those prepared by use of the unmodified Si powders, Si phases evolve to several hundred-micron-sized flakes, being similar to the typical eutectic Si in Al-Si casting alloys. It is assumed that the Al₂O₃-film-coated areas at Al/Si interface control the dissolution of Si into Al liquid, while in uncoated areas Al matrix and Si particles bond together by LPS, thus realizing AS-LPS.

• Periodical: Materials Science Forum (Volumes 809-810)
• Pages: 459-463
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.809-810.459
• Online since: December 2014
• Authors: Hui Cai*, Wan Chang Sun, Jumei Zhang, Peng Hui Cai
• Keywords: Al/Si Composites, Interfacial Modification, Liquid Phase Sintering, Microstructure

References

[1] C.W. Chien, S.L. Lee, J.C. Lin and M.T. Jahn: Mater. Lett., Vol. 52 (2002), p.334.

[2] Y.Y. Chen and D.D.L. Chung: J. Mater. Sci., Vol. 29 (1994), p.6069.

[3] P.W. Ruch, O. Beffort, S. Kleiner, L. Weber and P.J. Uggowitzer: Compos. Sci. Technol., Vol. 66 (2006), p.2677.

[4] Y.Q. Wang and B.L. Zhou: Compos. A, Vol. 27 (1996), p.1139.

[5] H.W. Xing, X.M. Cao, W.P. Hu, L.Z. Zhao and J.S. Zhang: Mater. Lett., Vol. 59 (2005), p.1563.

[6] L. Zhang, X.H. Qu, B.H. Duan, X.B. He, S.B. Ren and M.L. Qin: Compos. Sci. Technol., Vol. 68 (2008), p.2731.

[7] Y.F. Lee and S.L. Lee: Scr. Mater., Vol. 41 (1999), p.773.

[8] K.F. Kobayashi and L.M. Hogan: J. Mater. Sci., Vol. 20 (1985), p. (1961).

[9] Y.G. Wei, B.Q. Xiong, Y.A. Zhang, H.W. Liu, F. Wang and B.H. Zhu: Trans. Nonferrous Met. Soc. China, Vol. 17 (2007), p.368.

[10] S.C. Hogg, A. Lambourne, A. Ogilvy and P.S. Grant: Scr. Mater., Vol. 55 (2006), p.111.

[11] A.G. Rao, B.R.K. Rao, V.P. Deshmukh, A.K. Shah and B.P. Kashyap: Mater. Lett., Vol. 63 (2009), p.2628.

[12] Y.C. Chen, X. Ai, C.Z. Huang and B.Y. Wang: Mater. Sci. Eng. A, Vol. 288 (2000), p.19.

[13] V.R. Palkar, D. Thapa, M.S. Multani and S.G. Malghan: Mater. Lett., Vol. 36 (1998), 235.

[14] P.Y. Huang: Principles of Powder Metallurgy (Metallurgical Industry Press, Beijing 1997). (In Chinese).

[15] G.C. Guo: Liquid Phase Sintering of Powder Metallurgy Materials (Chemical Industry Press, Beijing 2003). (In Chinese).

[16] F. Wang, H. Cai and Y.P. Wang: Chinese J. Mater. Res., Vol. 23 (2009), p.495. (In Chinese).