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Superplasticity in a directionally solidified multiphase Ni-25Al-25Cr alloy

  • J. T. Guo EMAIL logo and J. Zhou
Published/Copyright: December 20, 2021
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 95 Issue 1

Abstract

A Ni-25Al-25Cr (at.%) alloy was directionally solidified under Ar atmosphere in an Al2O3 – SiO2 ceramic mold by the standard Bridgman method. The microstructure of the as-fabricated alloy was studied using optical microscopy, X-ray diffraction and scanning electron microscopy. The alloy was composed of β-NiAl dendritic arms, α-Cr interdendritic regions, fine α-Cr particles in the dendritic arms, and β-NiAl + α-Cr eutectic in the interdendritic regions. The mechanical properties were studied by tensile tests in the temperature range 1123–1373 K. The results showed that the alloy exhibits superplastic behavior at appropriate testing conditions. The balance between work hardening (by dislocation glide) and work softening (by dynamic recovery and recrystallization) is responsible for the large tensile elongation of the alloy.

Keywords: NiAl; Superplastic behavior; Casting; Microstructure
Prof. J. T. Guo, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016, P. R. China, Tel.: +86 24 2384 3531, Fax: +86 24 2389 1320

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Received: 2002-10-18
Published Online: 2021-12-20

© 2004 Carl Hanser Verlag, München

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  2. Editorial
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  16. Instructions to Authors/Richtlinien für Autoren
  17. Instructions for Authors
  18. Notifications/Mitteilungen
  19. Personal/Personelles
  20. Press/Presse
  21. Books/Bücher
  22. Events/Veranstaltungen
https://doi.org/10.3139/ijmr-2004-0006
Keywords for this article
NiAl; Superplastic behavior; Casting; Microstructure

Articles in the same Issue

  1. Frontmatter
  2. Editorial
  3. Editorial
  4. Articles AApplied
  5. Automated dihedral angle measurement in liquid phase sintered alloys
  6. Computer-aided analysis of repair welding of stamping tools
  7. Influence of retrogression and re-ageing on the mechanical and corrosion properties of 7039 aluminium alloy
  8. On the occurrence of Z-phase in a creep-tested 10 % Cr steel
  9. Superplasticity in a directionally solidified multiphase Ni-25Al-25Cr alloy
  10. Articles BBasic
  11. Assessment of thermodynamic parameters in the system ZrO2–Y2O3–Al2O3
  12. Assessment of the thermodynamics and phase diagram of the SrO–B2O3 system
  13. Thermodynamic description of the Au–Al system
  14. Chemical reaction and stability of Ti3SiC2 in Cu during high-temperature processing of Cu/Ti3SiC2 composites
  15. Precipitation behavior of an Fe-1.03 wt.% Cu alloy
  16. Instructions to Authors/Richtlinien für Autoren
  17. Instructions for Authors
  18. Notifications/Mitteilungen
  19. Personal/Personelles
  20. Press/Presse
  21. Books/Bücher
  22. Events/Veranstaltungen
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