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Influence of a rare-earth element on the solidification behaviour and mechanical properties of undercooled Al–Si alloys

  • Bo Dang , Zengyun Jian and Junfeng Xu
Published/Copyright: July 27, 2018
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 109 Issue 8

Abstract

The influence of undercooling and a rare earth (RE) metal modifier on the solidification behaviour of hypereutectic Al–Si alloys was investigated by the electromagnetic levitation technique combining analysis of high-speed video and scanning electron microscopy. The results show that, for Al–Si alloys without RE addition, the morphology of the primary silicon transforms from dendrites to fragmented bulks and granular grains and then to equiaxed grains with increasing degree of undercooling; the nucleation frequency increases exponentially, while the average grain size decreases exponentially. The effect of undercooling on microhardness was also analysed. On the addition of an RE metal to the Al–Si alloys, the critical undercooling of the morphological transition and the grain size decrease, while the nucleation number and nucleation frequency increase. A comparison of the microhardness before and after the RE addition reveals that the microhardness is also improved at similar degrees of undercooling.

Keywords: Growth morphology; Microstructure; Undercooling; Microhardness
*Correspondence address, Prof. Zengyun Jian, The Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices, Xi'an Technological University, Xuefu Middle Road No. 2, Xi'an Shaanxi 710021, P.R. China, Tel.: +86-29-86173323, Fax: +86-29-86173323, E-mail: ,

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Received: 2017-08-28
Accepted: 2018-03-12
Published Online: 2018-07-27
Published in Print: 2018-08-10

© 2018, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.111663
Keywords for this article
Growth morphology; Microstructure; Undercooling; Microhardness

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Dynamic fragmentation and spheroidization of α phase grains during hot deformation of Ti-6Al-4V alloy
  5. Formation and characterization of hot tearing in AZ series alloys
  6. The effect of quench-aging on the mechanical properties of Zn-27Al-1Cu alloy
  7. Microstructural and mechanical properties of novel β-type Ti–Nb–Ni alloys containing a second phase
  8. Microstructure evolution mechanisms of undercooled Ni80Cu20 alloys
  9. Microstructures and tensile properties of CuZrAlNb metallic glass composites under different cooling rates
  10. Influence of a rare-earth element on the solidification behaviour and mechanical properties of undercooled Al–Si alloys
  11. Microstructure of aluminide coatings on Ti6Al4V alloy produced by the slurry method with inorganic binder
  12. Ultrathin SnO2 nanorod/reduced graphene oxide nanosheet composites for electrochemical supercapacitor applications with excellent cyclic stability
  13. Combustion synthesis and formation mechanism of silver nanoparticles
  14. Phase relationship of the Ag–Zr–Cr system at 1000 and 750°C
  15. Thermal properties of carbonized composite materials based on carbon filled elastomeric matrices
  16. Short Communications
  17. Surface morphology and phase stability of titanium irradiated with 168 MeV 136Xe ions
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