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Effects of Si on the Electrical Conductivity, Microhardness, Microstructure and Hot Tearing of Al–0.8Fe–0.5Mg–0.4Ni Alloys

Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

Electrified automotive powertrains require new Al alloys with high castability and high electrical conductivity . This research presents the effects of Si on the electrical conductivity , microhardness , microstructure and hot tearing of Al–0.8 wt% Fe–0.5 wt% Mg–0.4 wt% Ni–x wt% Si alloys. The Al–Fe–Mg–Ni–Si alloys were prepared by mixing pure Al, Fe, and Ni, as well as Al–50 wt% Mg and Al-50 wt% Si master alloys at 720 °C. Silicon contents of 0.15 and 0.30 wt% were examined. The alloys were characterized using microhardness testing, optical and electron microscopy , X-ray diffraction, electrical conductivity measurements and hot tearing susceptibility testing. The microstructure of the Al–Fe–Mg–Ni–Si alloys contained fibrous as well as elongated or rounded Al3Ni and Al9FeNi intermetallics, with Mg and Si contained in the Al solid solution. Increasing Si content from 0.15 to 0.30 wt% in the Al–Fe–Mg–Ni–Si alloys resulted in more rounded intermetallics but nearly constant microhardness (~46 HV) and electrical conductivity (~50 %IACS). The hot tearing susceptibility of the Al–Fe–Mg–Ni–Si alloys was more severe than a modified A380 alloy but did not result in a complete separation of the casting .

Keywords

  • Electrical conductivity
  • Hot tearing
  • Aluminum alloys
  • Microhardness
  • Microstructure

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References

  1. Mbuya TO, Odera BO, Ng’ang’a SP (2003) Influence of iron on castability and properties of aluminium silicon alloys: Literature review. International Journal of Cast Metals Research 16:451–465. https://doi.org/10.1080/13640461.2003.11819622.

  2. Shin JS, Ko SH, Kim KT (2015) Development and characterization of low-silicon cast aluminum alloys for thermal dissipation. Journal of Alloys and Compounds 644:673–686. https://doi.org/10.1016/j.jallcom.2015.04.230.

  3. Mondolfo LF (1976) Aluminum alloys: Structure and properties. Butterworths and Co., Ltd., London. https://doi.org/10.1016/b978-0-408-70932-3.50404-6.

  4. Stadler F, Antrekowitsch H, Fragner W, Kaufmann H, Pinatel ER, Uggowitzer PJ (2013) The effect of main alloying elements on the physical properties of Al–Si foundry alloys. Materials Science and Engineering: A 560:481–491. https://doi.org/10.1016/j.msea.2012.09.093.

  5. Taylor JA (2004) The effect of iron in Al-Si casting alloys. Paper presented at the 35th Australian Foundry Institute National Conference, The University of Queensland Brisbane, Australia, 148–157 November 2004.

    Google Scholar 

  6. Cho YH, Kim HW, Kim W, Jo DA, Lee JM (2015) The effect of Ni additions on the microstructure and castability of low Si added al casting alloys. Materials Today: Proceedings 2:4924–4930. https://doi.org/10.1016/j.matpr.2015.10.058.

  7. Cho YH, Kim HW, Lee JM, Kim MS (2015) A new approach to the design of a low Si-added Al–Si casting alloy for optimising thermal conductivity and fluidity. J Mater Sci 50:7271–7281. https://doi.org/10.1007/s10853-015-9282-8.

  8. Wang ER, Hui XD, Wang SS, Zhao YF, Chen GL (2010) Improved mechanical properties in cast Al–Si alloys by combined alloying of Fe and Cu. Materials Science and Engineering: A 527:7878–7884. https://doi.org/10.1016/j.msea.2010.08.058.

  9. Easton MA, Wang H, Grandfield J, Davidson CJ, StJohn, DH, Sweet LD, Couper MJ (2012) Observation and prediction of the hot tear susceptibility of ternary Al-Si-Mg alloys. Metal and Mat Trans A 43:3227–3238. https://doi.org/10.1007/s11661-012-1132-6.

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Acknowledgements

The authors would like to thank Dr. D. Soldatov and Dr. G. Szymanski at the X-ray diffraction facility at the University of Guelph for their assistance. Appreciation also goes to Mr. Q. Li at Ryerson University for help with SEM imaging. The authors acknowledge Nemak Canada for their supply of the modified 380 ingots and master alloys. The authors would like to thank NSERC for financial support.

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Correspondence to Abdallah Elsayed .

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Kotiadis, S., Zimmer, A., Elsayed, A., Vandersluis, E., Ravindran, C. (2020). Effects of Si on the Electrical Conductivity, Microhardness, Microstructure and Hot Tearing of Al–0.8Fe–0.5Mg–0.4Ni Alloys. In: Tomsett, A. (eds) Light Metals 2020. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-36408-3_29

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