Mechanical Properties of the Directionally Solidified Ceramic Eutectic of Al2O3/Al16Ti5O34 Phase Structure

Abalı S., Ekerim A.

HIGH TEMPERATURE MATERIALS AND PROCESSES, vol.32, no.3, pp.309-315, 2013 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 32 Issue: 3
  • Publication Date: 2013
  • Doi Number: 10.1515/htmp-2012-0124
  • Journal Name: HIGH TEMPERATURE MATERIALS AND PROCESSES
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.309-315
  • Keywords: alumina, rutile, strength, eutectic, aluminum titanate, THERMAL-STABILITY, SINGLE-CRYSTALS, MICROSTRUCTURE, GROWTH, TEMPERATURE, COMPOSITE, STRENGTH, FRACTURE, BEHAVIOR, KNOOP
  • Çanakkale Onsekiz Mart University Affiliated: Yes

Abstract

Al2O3/TiO2 eutectics containing 62-64 wt% Al2O3 were fabricated by a laser floating zone method. Raman spectrometry was used to determine the phase composition. The compressive creep strength of AT36 (Al16Ti5O34/Al2O3) crystal at 1500 degrees C under the strain rate of 1.0 x 10(-4) s(-1) has 372 MPa, which is about higher than beta-Al2TiO5 and beta-Al2TiO5/Al2O3 crystals. High-temperature flexural strength, elastic modulus, hardness and fracture toughness of the AT36 crystals were analyzed. The highest flexure strength at ambient temperature was found in the material with 36 wt% TiO2. In addition, we briefly discussed the relationships between microstructure and mechanical properties in AT36 crystal.