Effect of Heat Treatment on Al-40Si Alloy Modified by Sr Addition

Abstract:

The Al-40Si alloy modified by 1.0 wt% Sr addition was heat-treated using L9(34) orthogonal test. The mechanical properties were measured. The microstructures were analyzed using optical microscope. After heat treatment, the hardness decreases about one times. The eutectic matrix and primary Si phase are both refined. The primary Si phase is refined and homogeneously distributes in the matrix with the solution temperature and time increasing. The optimal heat treatment condition is that the solution temperature, solution time, aging temperature, and aging time are 550 °C, 18 hours, 200 °C, and 5 hours, respectively. In addition, the theoretical optimal value for the hardness is 20.6 HRC, which is coherent with the practical optimal value.

• Periodical: Advanced Materials Research (Volumes 378-379)
• Pages: 108-111
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.378-379.108
• Online since: October 2011
• Authors: Wei Ke An, An Hui Cai, Xiang Fu Tan, Xiao Song Li, Yun Luo
• Keywords: Al-40Si Alloy, Heat Treatment, Sr Addition

References

[1] M.M. Haque and A. Sharif: J. Mater. Process. Technol. Vol. 118 (2001), pp.69-73.

[2] H. Torbian, J.P. Pathak, and S.N. Tiwari: Wear Vol. 172 (1994), pp.49-58.

[3] D.M. Stuart, N. Kazuhiro, and K.D. Arne: Acta Mater. Vol. 52 (2004), pp.4273-4280.

[4] H.S. Kang, W.Y. Yoon, K.H. Kim, M.H. Kim, Y.P. Yoon, and I.S. Cho: Mater. Sci. Eng. A Vol. 449-451 (2007), pp.334-337.

[5] H.C. Liao and G.X. Sun: Scripta Mater. Vol. 48 (2003), pp.1035-1039.

[6] G. Liu, G.D. Li, A.H. Cai, and Z.K. Chen: Mater. Des. Vol. 32 (2011), pp.121-126.

[7] X.S. Li, A.H. Cai, G. Liu, Y. Zhou, and J.J. Zeng: Adv. Mater. Res. Vol. 146-147 (2011), pp.454-459.

[8] X.Q. Cao and G.T. Yang: Rare Met. Mater. Eng. Vol. 35 (2006), pp.1121-1125, in Chinese.

[9] J.H. Zhang, Z.S. Ren, and Q. Zhao: Light Metal Vol. 10 (2007), pp.59-62, in Chinese.