Stress-induced phase transformation of ZrO{sub 2} in ZrO{sub 2} (3mol%Y{sub 2}O{sub 3})-25vol%Al{sub 2}O{sub 3} composite studied by transmission electron microscopy

Journal Article · Mon Mar 02 23:00:00 EST 1998 · Scripta Materialia

DOI:https://doi.org/10.1016/S1359-6462(98)00003-7· OSTI ID:619463

Lee, B T ^[1]; Lee, K H ^[2]; Hiraga, Kenji ^[3]

---

1. Kongju National Univ. (Korea, Republic of). Dept. of Materials Engineering
2. Chungnam National Univ., Taejon (Korea, Republic of). Dept. of Metallurgical Engineering
3. Tohoku Univ., Sendai (Japan). Inst. for Materials Research

To improve mechanical properties, fracture toughness in particular, ZrO{sub 2} ceramic has been widely used not only as a matrix, but also as a toughening agent. Among them, recently, the ZrO{sub 2}-Al{sub 2}O{sub 3} system has received much attention because of the applications to wear and tool materials in the Al{sub 2}O{sub 3}-rich part and superplastic deformation behavior at the high temperature in the ZrO{sub 2}-rich part. Furthermore, recent availability of high pure and fine-grained ZrO{sub 2} and Al{sub 2}O{sub 3} powders makes it possible to synthesize the composites with submicron size grains by pressureless-sintering at the comparatively low temperature of 1,450 C. The purpose of the present work is to investigate the stress-induced t-m phase transformation of ZrO{sub 2} in the ZrO{sub 2}(3mol%Y{sub 2}O{sub 3})-25vol%Al{sub 2}O{sub 3} bulk composite made by the use of micro-indentation. In addition, the fracture characteristic was studied by the observation of fracture surface made by 3-point bending test.

• OSTI ID: 619463
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 7 Vol. 38; ISSN 1359-6462; ISSN SCMAF7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
COMPOSITE MATERIALS
CRYSTAL-PHASE TRANSFORMATIONS
FRACTURE PROPERTIES
YTTRIUM OXIDES
ZIRCONIUM OXIDES