Aging Behavior of High Volume Fraction SiC Particles Reinforced 2024Al Composite

Abstract

Abstract: 2024 Al matrix composite reinforced by SiC particles with 45% volume fraction and um diameter was successfully fabricated by squeeze-exhaust casting method. The aging behavior of SiCp/2024Al composite at four temperatures was investigated and compared to 2024 alloy. It was found that the addition of high volume fraction SiC particles does not alter the aging sequence, but it significantly accelerates the kinetics of precipitation in the composite matrices. Therefore, the aging peak of the composite appears earlier than that of 2024Al alloy. This is attributed to the decrease in the activation energy for the precipitate formation and the increase in the precipitate growth rate due to the high density dislocations in the composite with high volume fraction particles. The high density dislocations, as preferential nucleation sites for precipitates, bring about the tiny and dense precipitates in the composite.

Key words: Squeeze-exhaust casting, SiC particles, Aging behavior, Activation energy

Xiufang WANG, Gaohui WU, Dongli SUN, Longtao JIANG, Yuanyuan HAN. Aging Behavior of High Volume Fraction SiC Particles Reinforced 2024Al Composite[J]. J Mater Sci Technol, 2004, 20(02): 167-172.

References

[1] Y.Song and T.N.Baker: Mater. Sci. Technol., 1994, 10, 406．
[2] Shangli DONG and Dezhang YANG: Mater. Eng., 1996, 8, 45． (in Chinese)
[3] T.G.Nieh and R.F.Karlak: Scripta Mater., 1984, 18, 25．
[4] D.J.Towle and C.M.Priend: Scripta Mater., 1992, 26, 437．
[5] Yichun LI, Wenzhu SHAO and Xiyong AN: Acta Mater. Com-positae Sin., 1993, 10(1) , 47． (in Chinese)
[6] I.Dutta, S.M.Allen and J.L.Hafley: Metall. Trans., 1991, 22A,2553．
[7] S.Suresh, T.Christman and Y.Sugimure: Scripta Mater., 1989,23, 1599．
[8] G.H.Wu, S.L.Ma, Y.C.Zhao and D.Z.Yang: Trans. NonferrousMet. Soc. China, 1997, 8, 818．
[9] Xingjiang LIU, Hua CUI and Jishan ZHANG: Heat Treatmentof Metal, 1997, 4, 28． (in Chinese)
[10] J.S.Lin, P.X.Li and R.J.Wu: Scripta Mater., 1993,,28, 281．
[11] Z.M.El-Baradie, O.A.El-Shahat and A.N.Abd El-Azim: J.Mater. Proc. Technol., 1998, 79, 1．
[12] J.S.Zhang, X.J.Liu, H.Cui, X.J.Duan, Z.Q.Sun and G.L.Chen:Mater. Sci. Eng., 1997, A225, 96．
[13] Hsu-Shen Chu, Kuo-Shung Liu and Jien-wei Yeh: ScriptaMater., 2001, 45, 541．
[14] T.S.Kim, T.H.Kim, K.H.Oh and H.I.Lee: J. Mater. Sci., 1992,27, 2599．
[15] Yongchun ZHAO: Ph.D. Thesis, Harbin Institute of Technology,2001, 9． (in Chinese)
[16] M.Gupta, T.S.Srivatsan, F.A.Mohamed and E.J.Lavernia: J.Mater. Sci., 1993, 28, 2245．
[17] A.Daoud and W.Reif: J. Mater. Proc. Technol, 2002, 123,313．
[18] T.W.Clyne and P.J.Withers: An Introduction to Metal MatrixComposites, Cambridge University Press, America, 1993．
[19] J.Bar, H.J.Gudladt, J.Illy and J.Lendvai: Mater. Sci. Eng.,1998, A248, 181．
[20] B.Dutta and M.K.Surappa: Scripts, Mater., 1995, 32, 731．
[21] T.R.McNelley and P.N.Kalu: Scripta Mater., 1991, 25, 1041．
[22] D.Srinivasan and M.K.Surappa: Scripta Mater., 1992, 27,1139．
[23] Gaohui WU: China Patent, No. 94114284． 1 (in Chinese)
[24] C.Badini, F.Marino and E.Verne: Mater. Sci.Eng., 1995,A191, 185．
[25] J.A.Augis and J.E.Bennett: J. Thermal Anal., 1978, 13, 283．
[26] C.Bartels, D.Raabe, G.Gottstein and U.Huber: Mater. Sci.Eng., 1997, A237, 12．