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Tensile failure in a superplastic alumina

  • Keijiro Hiraga EMAIL logo and Keishi Nakano
Published/Copyright: February 14, 2022
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 95 Issue 6

Abstract

Tensile failure in superplastic alumina shows a close similarity to ductile failure in metallic materials containing microvoids or hard inclusions. Microcracking, which appears as strain exceeding ~ 90% of the failure strain and leading to macroscopic cracking for final failure, is not caused by the propagation of the largest preexistent defects, but by extensive cavity coalescence. Such coalescence is found to occur as the thickness of the intervoid matrix decreases to a certain level due to an increase in the number and size of cavities. The data also show that there is no explicit critical grain size for the onset of microcracking, although microcracking and failure tend to occur at smaller strains as the initial grain size increases.

Keywords: Superplastic ductility; Void-coalescence; Cracking
Keijiro Hiraga Director, Fine-Grained Refractory Materials Group National Institute for Materials Science Ibaraki 305-0047, Japan Tel.: +81 29 859 2538 Fax: +81 29 859 2501

Dedicated to Professor Dr. Peter Neumann on the occasion of his 65th birthday

  1. K. H. is grateful to Prof. Dr. P. Neumann who motivated him to work in this field. The authors thank to Drs. T. S. Suzuki and Y. Sakka for the synthesis of the material used.

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Received: 2004-01-19
Accepted: 2004-02-10
Published Online: 2022-02-14

© 2004 Carl Hanser Verlag, München

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  27. Notifications/Mitteilungen
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https://doi.org/10.1515/ijmr-2004-0107
Keywords for this article
Superplastic ductility; Void-coalescence; Cracking

Articles in the same Issue

  1. Frontmatter
  2. Editorial
  3. Editorial
  4. Articles Basic
  5. Thermally assisted motion of dislocations in solid solution-strengthened fcc alloys and the concept of “stress equivalence”
  6. From single to collective dislocation glide instabilities: A hierarchy of scales, embracing the Neumann strain bursts
  7. Geometry and surface state effects on the mechanical response of Au nanostructures
  8. Microstructural evolution and its effect on the mechanical properties of Cu–Ag microcomposites
  9. Deformation behaviour of strontium titanate between room temperature and 1800 K under ambient pressure
  10. The deformation response of ultra-thin polymer films on steel sheet in a tensile straining test: the role of slip bands emerging at the polymer/metal interface
  11. Influence of dissolved gas molecules on the size recovery kinetics of cold-rolled BPA-PC
  12. Comparison between Monte Carlo and Cluster Variation method calculations in the BCC Fe–Al system including tetrahedron interactions
  13. Experimental study and Cluster Variation modelling of the A2/B2 equilibria at the titanium-rich side of the Ti–Fe system
  14. Phases and phase equilibria in the Fe–Al–Zr system
  15. On the plate-like τ-phase formation in MnAl–C alloys
  16. Articles Applied
  17. The grain boundary hardness in austenitic stainless steels studied by nanoindentations
  18. The effect of grain size on the mechanical properties of nanonickel examined by nanoindentation
  19. Microstructures and mechanical properties of V–V3Si eutectic composites
  20. Grain boundary characterization and grain size measurement in an ultrafine-grained steel
  21. On the determination of the volume fraction of Ni4Ti3 precipitates in binary Ni-rich NiTi shape memory alloys
  22. Mechanical properties of NiAl–Cr alloys in relation to microstructure and atomic defects
  23. Characterization of the cyclic deformation behaviour and fatigue crack initiation on titanium in physiological media by electrochemical techniques
  24. Effect of prestraining on high-temperature fatigue behaviour of two Ni-base superalloys
  25. Influence of surface defects and edge geometry on the bending strength of slip-cast ZrO2 micro-specimens
  26. Tensile failure in a superplastic alumina
  27. Notifications/Mitteilungen
  28. Personal/Personelles
  29. Conferences/Konferenzen
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