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On the role of alloying elements in the formation of serrated grain boundaries in Ni-based alloys

  • Mathieu Terner , Hyun-Uk Hong , Je-Hyun Lee and Baig-Gyu Choi
Published/Copyright: February 26, 2016
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 107 Issue 3

Abstract

Ni-based model alloys were used to study the effect of alloying elements, namely Cr, Mo, C and Zr on the occurrence of grain boundary serration. The model alloys were free of aluminum to exclude precipitation of second-phase γ′. Similarly, the carbon content was very low, when present, to prevent precipitation of carbides. A special heat treatment involving slow cooling was used to promote grain boundary serration. No significant sign of serration was observed for Ni-10Cr-10Mo, Ni-20Cr-10Mo and Ni-10Cr-10Mo-0.05C model alloys. However, substantial serration was observed for Ni-10Cr-10Mo-0.5Zr and Ni-20Cr-0.5Zr model alloys. Serrated grain boundaries were observed in the absence of either γ′ or carbides. Zirconium-rich precipitates were recognized at serrated grain boundaries though their involvement in the occurrence of serration was doubtful. A mechanism of grain boundary serration formation is proposed.

Keywords: Grain boundary serration; Ni-based alloys; Alloying elements; Serration mechanism; Heat treatment
*Correspondence address, Prof. Hyun-Uk Hong, Department of Materials Science and Engineering, Changwon National University, 20 Changwondaehak-ro, Uichang-gu, Changwon, Gyeongnam 641-773, Republic of Korea. Tel.: +82-55-213-3699, Fax: +82-55-261-7017, E-mail:

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Received: 2015-08-07
Accepted: 2015-10-14
Published Online: 2016-02-26
Published in Print: 2016-03-11

© 2016, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.111332
Keywords for this article
Grain boundary serration; Ni-based alloys; Alloying elements; Serration mechanism; Heat treatment

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Fe–N and Fe–N–C phase equilibria above 853 K studied by nitriding/nitrocarburising and secondary annealing
  5. Microstructural development and crystallographic properties of decomposing Fe–N–C compound layers
  6. Experimental study on phase relationships in the Co-rich portion of the Co–Ti–Zr system
  7. On the role of alloying elements in the formation of serrated grain boundaries in Ni-based alloys
  8. Effect of drawing with shear on structure and properties of low-carbon steel
  9. Experimental study of FLD0 for aluminum alloy using digital image correlation with modified ISO method
  10. Global modeling for elevated temperature flow behavior of 6013 aluminum alloy during two-pass deformation
  11. The relationship between the pore size distribution and the thermo-mechanical properties of high alumina refractory castables
  12. Optimization of the phase composition of high-calcium-content slag for stabilization and the obtaining of hydraulic properties
  13. Short Communications
  14. Dynamic recrystallization kinetics in Mg-3Gd-1Zn magnesium alloy during hot deformation
  15. Original Contributions
  16. Photoluminescence properties of Tb3+-doped stalk-like Al2O3
  17. Effect of deposition parameters on the crystal orientation and growth of Ag nanowires
  18. DGM News
  19. DGM News
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