High-resolution stress mapping of Al2O3/monoclinic ZrO2 and Al2O3/cubic ZrO2(Y2O3) eutectics using scanning near-field optical microscopy

S. Fukura, H. Kagi, M. Nakai, Kazumasa Sugiyama, T. Fukuda

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Scanning near-field optical microscopy (SNOM) technique was applied to nanometer-scale residual stress mapping for directionally solidified Al2O3/monochromic ZrO2 and Al2O3/cubic ZrO2(Y2O3) eutectics, which are ranked as candidates for high-strength materials at high temperatures. These eutectic composites were grown using the micro pulling down (μ-PD) method with a radio frequency heating system. Topographic images and fluorescence spectra of those eutectic composites were measured simultaneously for each pixel on a sample. Its peak intensity, peak position, and peak width, which, respectively, correspond to the abundance of Al2O3, stress in the grain, and the anisotropy of that stress, were estimated for each fluorescence spectrum. The distribution of residual stress was observed on a sample surface with spatial resolution of 300 nm; the spatial resolution was constrained by the optical fiber aperture size. Tensile stress was observed in Al2O3 of Al2O3/mZrO2 and compressive stress was observed in Al2O3 of Al2O3/cZrO2. The stress distributions were visualized within a single Al2O3 grain. Considerable stress anisotropy was detected in the grain boundary between Al2O3 and ZrO2 for both eutectics.

Original languageEnglish
Pages (from-to)998-1004
Number of pages7
JournalJournal of Crystal Growth
Volume311
Issue number3
DOIs
Publication statusPublished - 2009 Jan 15

Keywords

  • A1. Eutectics
  • A1. Stresses
  • A2. Growth from melt
  • B1. Oxides

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Materials Chemistry
  • Inorganic Chemistry

Fingerprint

Dive into the research topics of 'High-resolution stress mapping of Al2O3/monoclinic ZrO2 and Al2O3/cubic ZrO2(Y2O3) eutectics using scanning near-field optical microscopy'. Together they form a unique fingerprint.

Cite this