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Strain, stress and stress relaxation in oxidized ZrCuAl-based bulk metallic glass

Journal Article


Abstract


  • Surface engineering of Zr51.3Al8.5Cu31.3Ni4Ti4.9 bulk metallic glass (BMG) by gaseous oxidizing below the glass-transition temperature is investigated as a means to introduce compressive residual stress in the surface region. The ZrCuAl-based BMG was exposed to an extremely low oxygen partial pressure of 10−41 bar at 600 K for 60 h. The oxidizing treatment led to the formation of an internal oxidation zone, consisting of finely dispersed nano-crystalline cubic ZrO2 (c-ZrO2), metallic regions inclined with the surface and Cu-hillocks at the surface. The stresses introduced by the volume expansion associated with oxidation were evaluated from i) the lattice strains within c-ZrO2, as determined with an X-ray diffraction (XRD) based method, and ii) strain-relaxation as a response to annular focused ion beam (FIB) milling, as monitored with digital image correlation (DIC). XRD analysis yielded -1.5 GPa (compressive stress) in the nano-crystalline c-ZrO2, while the strain relaxation monitored with FIB-DIC analysis indicated compressive residual stresses of −1.4 GPa in the internal oxidation zone. The strains and stresses determined with the independent measurement methods are discussed. The quantitative macro-strains are discussed in relation to the microstructural features and stress relaxation mechanisms during evolution of the internal oxidation zone.

UOW Authors


  •   Nancarrow, Mitchell (external author)
  •   Niessen, Frank (external author)
  •   Pereloma, Elena

Publication Date


  • 2020

Citation


  • Haratian, S., Niessen, F., Grumsen, F. B., Nancarrow, M. J. B., Pereloma, E. V., Villa, M., . . . Somers, M. A. J. (2020). Strain, stress and stress relaxation in oxidized ZrCuAl-based bulk metallic glass. Acta Materialia, 200, 674-685. doi:10.1016/j.actamat.2020.09.049

Scopus Eid


  • 2-s2.0-85091342384

Web Of Science Accession Number


Start Page


  • 674

End Page


  • 685

Volume


  • 200

Abstract


  • Surface engineering of Zr51.3Al8.5Cu31.3Ni4Ti4.9 bulk metallic glass (BMG) by gaseous oxidizing below the glass-transition temperature is investigated as a means to introduce compressive residual stress in the surface region. The ZrCuAl-based BMG was exposed to an extremely low oxygen partial pressure of 10−41 bar at 600 K for 60 h. The oxidizing treatment led to the formation of an internal oxidation zone, consisting of finely dispersed nano-crystalline cubic ZrO2 (c-ZrO2), metallic regions inclined with the surface and Cu-hillocks at the surface. The stresses introduced by the volume expansion associated with oxidation were evaluated from i) the lattice strains within c-ZrO2, as determined with an X-ray diffraction (XRD) based method, and ii) strain-relaxation as a response to annular focused ion beam (FIB) milling, as monitored with digital image correlation (DIC). XRD analysis yielded -1.5 GPa (compressive stress) in the nano-crystalline c-ZrO2, while the strain relaxation monitored with FIB-DIC analysis indicated compressive residual stresses of −1.4 GPa in the internal oxidation zone. The strains and stresses determined with the independent measurement methods are discussed. The quantitative macro-strains are discussed in relation to the microstructural features and stress relaxation mechanisms during evolution of the internal oxidation zone.

UOW Authors


  •   Nancarrow, Mitchell (external author)
  •   Niessen, Frank (external author)
  •   Pereloma, Elena

Publication Date


  • 2020

Citation


  • Haratian, S., Niessen, F., Grumsen, F. B., Nancarrow, M. J. B., Pereloma, E. V., Villa, M., . . . Somers, M. A. J. (2020). Strain, stress and stress relaxation in oxidized ZrCuAl-based bulk metallic glass. Acta Materialia, 200, 674-685. doi:10.1016/j.actamat.2020.09.049

Scopus Eid


  • 2-s2.0-85091342384

Web Of Science Accession Number


Start Page


  • 674

End Page


  • 685

Volume


  • 200