Research on Characteristics of Heat Treatment of Squeeze Cast Al-Cu-Mg Alloy

Abstract:

A high strength Al-Cu-Mg alloy was prepared by squeeze casting. The effects of squeeze casting and heat treatment on the microstructures and mechanical properties of the alloy were studied. It was found that squeeze casting refined the microstructure and reduced the micro-segregation markedly, and also accelerated the diffusion process of solute atoms during solution heat treatment. Tensile strength and elongation of squeeze casting alloy were much higher than those of gravity casting alloy under both the as-cast and heat-treated conditions. In addition, the Al-Cu-Mg alloy prepared by squeeze casting showed good natural aging response, and the naturally-aged alloy possessed a slightly lower tensile strength but better elongation compared to full artificial aging. After solution heat treatment at 495 for 9h and further natural aging for 48h or artificial aging at 190 for 6h, the tensile strength of squeeze casting alloy reached to 472MPa and 475MPa, respectively, and the elongation was 18.9% and 12.7% accordingly. Based on the experimental results, the mechanism of microstructural evolution of squeeze casting Al-Cu-Mg alloy during heat treatment was discussed, and the effect of squeeze casting on the kinetics of solute diffusion and aging precipitation was studied.

• Periodical: Materials Science Forum (Volume 749)
• Pages: 54-60
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.749.54
• Online since: March 2013
• Authors: Yao Qiang Gan, Lei Lu, Da Tong Zhang, Wei Wen Zhang, Yuan Yuan Li
• Keywords: Al-Cu-Mg Alloy, Heat Treatment, Mechanical Property, Microstructure, Squeeze Casting

References

[1] F.S. Pan, D.F. Zhang, Aluminium alloy and application, Chemical Industry Press, Beijing, 2006, pp.300-306.

[2] S.J. Luo, B.G. Chen, P.X. Qi, Liquid die forging and squeeze casting technology, Chemical Industry Press, Beijing, 2007, pp.1-4.

[3] M. R Ghomashchi, A Vikhrov, Squeeze casting: an overview, Journal of Materials Processing Technology. 101 (2000) 1-9.

DOI: 10.1016/s0924-0136(99)00291-5

[4] A. Maleki, B. Niroumand, A. Shafyei, Effects of squeeze casting parameters on density, macrostructure and hardness of LM13 alloy, Materials Science and Engineering A. 428 (2006) 135-140.

DOI: 10.1016/j.msea.2006.04.099

[5] M. Gallerneault, G. Durrant, B. Cantor, The squeeze casting of hypoeutectic binary Al-Cu, Metallurgical and Materials Transactions A. 27 (1996) 4121-4132.

DOI: 10.1007/bf02595660

[6] E. Hajjari, M. Divandari, An investigation on the microstructure and tensile properties of direct squeeze cast and gravity die cast 2024 wrought Al alloy, Materials and Design. 29 (2008) 1685-1689.

DOI: 10.1016/j.matdes.2008.04.012

[7] T.M. Yue, Squeeze casting of high-strength aluminum wrought alloy AA7010, Journal of Materials Processing Technology. 66 (1997) 179-185.

DOI: 10.1016/s0924-0136(96)02516-2

[8] M.S. Yong, A.J. Clegg, Process optimisation for a squeeze cast magnesium alloy, Journal of Materials Processing Technology. 145 (2004) 134-141.

DOI: 10.1016/j.jmatprotec.2003.07.006

[9] Y. Zhong, D.S. Yan, G.Y. Su, K. Yang, Microsegregation and improving method of a squeeze cast LY12 alloy, Acta Metallurgica Sinica. 37 (2001) 42-46.

[10] M. Song, Y.H. He, D.H. Xiao, B.Y. Huang, Effect of thermomechanical treatment on the mechanical properties of an Al–Cu–Mg alloy, Materials and Design. 30 (2009) 857-861.

DOI: 10.1016/j.matdes.2008.05.053

[11] S.K. Son, M. Takeda, M. Mitome, Y. Bando, T. Endo, Precipitation behavior of an Al-Cu alloy during isothermal aging at low temperatures, Materials Letters. 59 (2005) 629-632.

DOI: 10.1016/j.matlet.2004.10.058

[12] B. Klobes, K. Maier, T.E.M. Staab, Natural ageing of Al–Cu–Mg revisited from a local perspective, Materials Science and Engineering A. 528 (2011) 3253-3260.

DOI: 10.1016/j.msea.2011.01.002

[13] L.B. Wang, B.Y. Yu, Y. Wang, H.P. Yu, Influence of heat treatment on structure and properties of Al-Cu alloy, Hot Working Technology. 35 (2006) 25-26.

[14] T.S. Parel, S.C. Wang, M. J. Starink, Hardening of an Al–Cu–Mg alloy containing Types I and II S phase precipitates, Materials and Design. 31 (2010) s2-s5.

DOI: 10.1016/j.matdes.2009.12.048

[15] M.Z. Zhou, D.Q. Yi, D.Y. Yin T.R. Hong, D.Y. Huang, Effect of electric field on kinetics of formation of S phase in 2E12 aluminum alloy, The Chinese journal of Nonferrous Metals. 20 (2010) 1290-1295.

[16] W. Li, J.P. Long, B.L. Shen, S.J. Gao, M.J. Tu, DSC Study on the Age-precipitation Behavior of Al-4. 5Cu Alloy and Mullite-fiber Reinforced Al-4. 5Cu Composite, Journal of Instrumental Analysis. 21 (2002) 8-10.

[17] F. Wang, Q.F. Li, H.W. Duan, B.Y. Yu, H.P. Yu, Effects of heat treatment on structure and properties of direct squeeze casting Al-5Cu alloy, Special Casting and Nonferrous Alloys. 26 (2006) 649-652.

[18] X.T. Liu, J.Z. Cui, Study on the diffusion kinetics of aluminum alloy cast during homogenizing penetration, Materials Review. 18 (2004) 102-104.

[19] Y. Zhong, G.Y. Su, K. Yang, Microsegregation and improved methods of squeeze casting 2024 aluminium alloy, Journal of Materials Science and Technology. 19 (2003) 413-216.

[20] S.W. Kim, D.Y. Kim, W.G. Kim, K.D. Woo, The study on characteristics of heat treatment of the direct squeeze cast 7075 wrought Al alloy, Materials Science and Engineering A. 304-306 (2001) 721-726.

DOI: 10.1016/s0921-5093(00)01594-x