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Journal of Materials Science

, Volume 27, Issue 6, pp 1633–1641 | Cite as

Sources of acoustic emission during fatigue of Ti-6Al-4V: effect of microstructure

  • D. H. Kohn
  • P. Ducheyne
  • J. Awerbuch
Papers

Abstract

The fundamentals of acoustic emission (AE) analysis of fatigue cracking were applied to Ti-6Al-4V. The effect of microstructure on the characteristics of the AE events generated and the failure mechanisms which produced AE in Ti-6Al-4V were established. Lamellar microstructures generated one to two orders of magnitude more emission than equiaxed microstructures. The combination of larger grain size, more continuous α/β interfaces, more tortuous crack-front geometry, cleavage and intergranular fracture in lamellar microstructures accounts for the greater amount of emission. For lamellar microstructures, most AE events were generated in the upper 20% of the stress range, whereas in equiaxed microstructures, most events were generated at lower stresses. Most AE events were generated during crack opening and also at low stresses. AE events having high level intensities were also generated at stresses other than the peak stress. This is because in titanium alloys, which have both high strength and toughness, AE events are generated from both plastic zone extension and crack extension.

Keywords

Grain Size Microstructure Fatigue Titanium Failure Mechanism 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1992

Authors and Affiliations

  • D. H. Kohn
    • 1
  • P. Ducheyne
    • 1
  • J. Awerbuch
    • 2
  1. 1.Department of BioengineeringUniversity of PennsylvaniaPhiladelphiaUSA
  2. 2.Department of Mechanical Engineering and MechanicsDrexel UniversityPhiladelphiaUSA

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