Plastically deforming amorphous ZrO2-Al2O3

✍ Scribed by A.S. Gandhi; V. Jayaram

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 226 KB
• Volume: 51
• Category: Article
• ISSN: 1359-6454
• DOI: 10.1016/s1359-6454(02)00566-9

✦ Synopsis

We report for the first time non-viscous, plastic deformation in an amorphous oxide: ZrO 2 -Al 2 O 3 . Dense samples of amorphous ZrO 2 -Al 2 O 3 made by hot pressing spray-pyrolysed powder were deformed in uniaxial compression at 600-700°C at strain rates from 6 × 10 Ϫ5 s Ϫ1 to 10 Ϫ3 s Ϫ1 . A transition from elastic to plastic deformation occurred at a critical stress ~360 MPa. The onset of plastic deformation was associated with a drop in the stress by 20-25%. Little influence of strain and strain rate on the flow stress was observed. The non-viscous, plastic deformation is related to the open structure of the amorphous phase as indicated by its low true density.