Journal of Materials Science

, Volume 30, Issue 5, pp 1277–1282 | Cite as

Measurement of residual stresses in Al2O3/Ni laminated composites using an X-ray diffraction technique

  • L. Hehn
  • C. Zheng
  • J. J. MecholskyJr
  • C. R. Hubbard


Using an X-ray diffraction technique, macro-residual stresses were measured in laminated composites consisting of alternating layers of α-Al2O3 and nickel. The in-plane thermal mismatch stresses which develop during fabrication were found to be compressive and tensile in the α-Al2O3 and nickel layers, respectively. The magnitude of the in-plane stresses was found to be ≈ 110 MPa. Models of laminate structures predict the stress state to be biaxial in the plane of the layers. However, substantial stresses were observed perpendicular to the plane of the laminate; this stress might be due to the hot-pressing procedure used to fabricate the samples. The stress on the side surface of a laminate was measured using the indentation method and the results were consistent with those obtained by the X-ray method. Three samples were heated to 700, 900 and 1000 °C, respectively, and then cooled to test the effect of stress relaxation of the residual stresses due to the thermal expansion. The heat treatments (700–1000 °C) had no effect on the measured stress states of the laminates.


Nickel Heat Treatment Stress State Residual Stress Thermal Expansion 
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Copyright information

© Chapman & Hall 1995

Authors and Affiliations

  • L. Hehn
    • 1
  • C. Zheng
    • 1
  • J. J. MecholskyJr
    • 1
  • C. R. Hubbard
    • 2
  1. 1.Department of Materials Science and EngineeringUniversity of FloridaGainesvilleUSA
  2. 2.High Temperature Materials LaboratoryOak Ridge National LaboratoryOak RidgeUSA

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