Flow stress behaviour and microstructural analysis of hot deformed Aluminium matrix composites reinforced with CuZnAlNi shape memory alloy particles

Authors

  • Kenneth K. Alaneme Materials Design and Structural Integrity Research Group, Department of Metallurgical and Materials Engineering, Federal University of Technology - Department of Metallurgical and Materials Engineering, Federal University of Technology https://orcid.org/0000-0002-1582-4702
  • Michael O. Bodunrin Materials Design and Structural Integrity Research Group, Department of Metallurgical and Materials Engineering, Federal University of Technology - Department of Metallurgical and Materials Engineering, Federal University of Technology - School of Chemical and Metallurgical Engineering, University of the Witwatersrand https://orcid.org/0000-0001-6736-4771
  • Lesley H. Chown School of Chemical and Metallurgical Engineering, University of the Witwatersrand - DST-NRF Centre of Excellence in Strong Materials, University of the Witwatersrand https://orcid.org/0000-0001-9699-6065
  • Nthabiseng B. Maledi School of Chemical and Metallurgical Engineering, University of the Witwatersrand https://orcid.org/0000-0003-2862-2218

DOI:

https://doi.org/10.3989/revmetalm.170

Keywords:

CuZnAlNi alloy, Flow stress, Hot deformation, Microstructure, Shape memory alloy reinforced Al based composites, Strengthening mechanism

Abstract


The compressive flow stress behaviour and microstructures of hot deformed Al alloy matrix com­posites (AMCs) reinforced with CuZnAlNi based shape memory alloy (SMA) particles was investigated. Al-Mg-Si based alloy, reinforced with 4, 6, and 8 wt.% Cu-18Zn-7Al-0.3Ni, and 8 wt.% SiC particles, were produced by double stir casting and subjected to hot compression testing at 1.0 s-1 strain rate, 400 °C temperature, and ~ 60% constant global strain using a Gleeble 3500 thermomechanical simulator. The starting and as-deformed micro­structures of the composites were examined using optical microscopy. The use of Cu-18Zn-7Al-0.3Ni particles as reinforcement resulted in the development of finer matrix structure compared with the use of SiC. The flow stress and hardness of the AMCs reinforced with Cu-18Zn-7Al-0.3Ni particles were generally higher than that of the unreinforced Al alloy and the SiC reinforced Al alloy. Also the flow stress, and to a large extent the hardness, increased with increase in the weight percent of Cu-18Zn-7Al-0.3Ni particles in the AMC. The improvement observed with the use of Cu-18Zn-7Al-0.3Ni alloy particles was ascribed to the combination of enhanced matrix grain refinement strengthening, interfacial strengthening, compressive residual stresses, high thermal conductiv­ity, and damping capacity offered by the Cu-18Zn-7Al-0.3Ni alloy.

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References

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Published

2020-06-30

How to Cite

Alaneme, K. K., Bodunrin, M. O., Chown, L. H., & Maledi, N. B. (2020). Flow stress behaviour and microstructural analysis of hot deformed Aluminium matrix composites reinforced with CuZnAlNi shape memory alloy particles. Revista De Metalurgia, 56(2), e170. https://doi.org/10.3989/revmetalm.170

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