Metallurgical and Materials Transactions A

, Volume 41, Issue 11, pp 2816–2828 | Cite as

Hydride-Phase Formation and its Influence on Fatigue Crack Propagation Behavior in a Zircaloy-4 Alloy

  • Elena Garlea
  • Hahn Choo
  • Gongyao Y. Wang
  • Peter K. Liaw
  • Bjørn Clausen
  • Donald W. Brown
  • Jungwon Park
  • Philip D. Rack
  • Edward A. Kenik
Article

Abstract

The hydride-phase formation and its influence on the fatigue behavior of a Zircaloy-4 alloy charged with hydrogen gas are investigated. First, the microstructure and fatigue crack propagation rate of the alloy in the as-received condition are studied. Second, the formation and homogeneous distribution of the delta zirconium hydride in the bulk and its effect on the fatigue crack propagation rate are presented. The results show that in the presence of hydrides, the zirconium alloy exhibits reduced toughness and enhanced crack growth rates. Finally, the influence of a preexisting fatigue crack in the specimen and the subsequent hydride formation are examined. The residual lattice strain profile around the fatigue crack tip is measured using neutron diffraction. It is observed that the combined effects of residual strains and hydride precipitation on the fatigue behavior are more severe leading to propagation of the crack under near threshold loading.

Notes

Acknowledgments

E. Garlea acknowledges the support of the National Science Foundation (NSF) International Materials Institutes (IMI) Program (DMR-0231320) and the Tennessee Advanced Materials Laboratory Fellowship Program. E. Garlea is grateful to Drs. D.A. Smith and S.J. Randolph for valuable suggestions regarding the nickel sputtering. This work has benefited from the use of Lujan Neutron Scattering Center at LANSCE, which is funded by the Office of Basic Energy Sciences (Department of Energy). Los Alamos National Laboratory is operated by Los Alamos National Security LLC under DOE Contract De-AC52-06NA25396. EBSD analysis was conducted at the SHaRE User Facility, which is sponsored at Oak Ridge National Laboratory by the Division of Scientific User Facilities, Office of Science, U.S. Department of Energy.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2010

Authors and Affiliations

  • Elena Garlea
    • 1
    • 2
  • Hahn Choo
    • 1
    • 3
  • Gongyao Y. Wang
    • 1
  • Peter K. Liaw
    • 1
  • Bjørn Clausen
    • 4
  • Donald W. Brown
    • 5
  • Jungwon Park
    • 1
    • 6
  • Philip D. Rack
    • 1
  • Edward A. Kenik
    • 7
  1. 1.Department of Materials Science and EngineeringThe University of TennesseeKnoxvilleUSA
  2. 2.Applied Technologies DivisionY-12 National Security ComplexOak RidgeUSA
  3. 3.Neutron Scattering Science DivisionOak Ridge National LaboratoryOak RidgeUSA
  4. 4.LANSCE-LCLos Alamos National LaboratoryLos AlamosUSA
  5. 5.MST-8Los Alamos National LaboratoryLos AlamosUSA
  6. 6.dpiX, LLCColorado SpringsUSA
  7. 7.Material Science and Technology DivisionOak Ridge National LaboratoryOak RidgeUSA

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