Residual stress determination in oxidized bulk metallic glass using X-ray diffraction and FIB/DIC methods

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The presence of residual stresses inside the engineering components generated by local inelastic deformation can influence material’s performance considerably during mechanical loading. Surface engineering of ZrCuAl-based bulk metallic glasses (BMGs) by low-temperature (<Tg) gaseous oxidizing is hypothesized to be possible in order to build-up compressive residual stresses in the surface region, which then results in decelerating the shear band propagation during deformation. In the current study stresses introduced as a consequence of ZrO2 (Al2O3) formation on thermochemically oxidized (Zr55Cu30Al10Ni5)98Er2 BMG were investigated. For this purpose, conventional X-ray diffraction sin2ψ and incremental core-ring focused ion beam (FIB) milling methods have been utilized. The BMG was initially oxidized in the controlled gaseous atmospheres imposing an extremely high pO2 at 600 K for 60 hr. The residual stress sin2ψ analysis was conducted on (011) reflection of the tetragonal-ZrO2 peak where it reveals the existence of compressive stress in ZrO2. Surface strain relief monitored in high-resolution SEM imaging of a deposited stochastic pattern during gradual milling and measured by digital image correlation (DIC) also indicated the occurrence of compressive residual stresses in the surface region of the oxidized BMG.
Original languageEnglish
Publication date2019
Number of pages1
Publication statusPublished - 2019
Event26th International Symposium on
Metastable, Amorphous and Nanostructured Materials (ISMANAM 2019)
- Raintree, Annasalai, Chennai, India
Duration: 8 Jul 201912 Jul 2019
https://mme.iitm.ac.in/ismanam2019/

Conference

Conference26th International Symposium on
Metastable, Amorphous and Nanostructured Materials (ISMANAM 2019)
LocationRaintree, Annasalai
CountryIndia
CityChennai
Period08/07/201912/07/2019
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