Hot Deformation Behaviors and Microstructure Evolution of SiCp/Al Composites

Abstract:

In order to explore the compressive properties of aluminium matrix composite reinforced with middle content SiC particles, hot compression behavior of 30%SiCp/2024A1 composite was investigated using Gleeble-1500 system at a temperatures range from 350 to 500°C and strain rates from 0.01 to 10 s⁻¹. The associated structural changes were studied by OM, SEM and TEM observations. The results show that the true stress–true strain curves exhibited a peak stress at a small strain (<0.1), after which the flow stresses decreased monotonically until high strains, showing a dynamic flow softening. The stress level decreased with increasing deformation temperature and decreasing strain rate, indicating that the composite is a positive strain rate sensitive material. And therefore there will be a enough time for dynamic recrystallization to complete nucleation and growth at low strain rate and high deformation temperatures.

• Periodical: Materials Science Forum (Volume 849)
• Pages: 430-435
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.849.430
• Online since: March 2016
• Authors: Shi Ming Hao*, Jing Pei Xie, Li Ben Li, Ai Qin Wang, Wen Yan Wang, Ji Wen Li
• Keywords: Flow Stress, Hot Deformation, Microstructure, SiCp/Al Composites

References

[1] J. M. Torralba, C. E. Da Costa, F. Velasco, P/M aluminum matrix composites: an overview, J. Mater. Process. Technol. 133 (2003)203-206.

[2] L. M. Tham, M. Gupta, L. Cheng, Effect of reinforcement volume fraction on the evolution of reinforcement size during the extrusion of Al-SiC composites, Mater. Sci. Eng. A, 326 (2002) 355-363.

DOI: 10.1016/s0921-5093(01)01526-x

[3] V. C. Srivastava, V. Jindal, V. Uhlenwinkel, K. Bauckhage, Hot-deformation behaviour of spray-formed 2014 Al+SiCp metal matrix composites, Mater. Sci. Eng. A, 477(2008) 86-95.

DOI: 10.1016/j.msea.2007.06.086

[4] L. Ceschini, G. Minak, A. Morri, Effect of friction stir welding on microstructure, tensile and fatigue properties of the AA7005/10vol. % Al2O3p composite, Compos. Sci. Technol. 69 (2009) 1783-1789.

DOI: 10.1016/j.compscitech.2005.04.044

[5] C. M. Cepeda-Jimenez, O. A. Ruano, M. Carsi, Study of hot deformation of an Al-Cu-Mg alloy using processing maps and microstructural characterization, Mater. Sci. . Eng. A, 552(2012)530-539.

DOI: 10.1016/j.msea.2012.05.082

[6] J. C. Shao, B. L. Xiao, Q. Z. Wang, Constitutive flow behavior and hot workability of powder metallurgy processed 20vol. % SiCp/2024Al composite, Mater. Sci. Eng. A, 527(2010) 7865-7872.

DOI: 10.1016/j.msea.2010.08.080

[7] A. M. De Sanctis, E. Evangelista, A. Forcellese, Y. Z. Wang, Hot formability studies on 359/SiC/20p and their application in forging optimisation , Appl. Compos. Mater. 3 (1996) 179-198.

DOI: 10.1007/bf00135055

[8] Jin N, Zhang H, Han Y, et al. Hot deformation behavior of 7150 aluminum alloy during compression at elevated temperature[J]. Mater. Char. 60(2009): 530-536.

DOI: 10.1016/j.matchar.2008.12.012

[9] Huang X, Zhang H, Han Y, et al. Hot deformation behavior of 2026 aluminum alloy during compression at elevated temperature[J]. Mater. Sci. Eng. A, 527(2010): 485-490.

DOI: 10.1016/j.msea.2009.09.042

[10] Laasraoui A, Jonas J J. Prediction of steel flow stresses at high temperatures and strain rates [J]. Metall. trans. A, 22(1991): 1545-1558.

DOI: 10.1007/bf02667368