Electric-Field-Induced Crack Growth Behavior in PZT/Al2O3 Composites期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Electric-Field-Induced Crack Growth Behavior in PZT/Al₂O₃ Composites

Authors:	Ken-ichi Tajima † Hae Jin Hwang Mutsuo Sando Koichi Niihara

Affiliation:	Synergy Ceramics Laboratory, FCRA, Nagoya 462–8510, Japan;National Industrial Research Institute of Nagoya, Nagoya 462–8510, Japan;The Institute of Scientific and Industrial Research, Osaka University, Osaka 567–0047, Japan

Abstract:	Hard lead zirconate titanate (PZT) and PZT/Al₂O₃ composites were prepared and the alternating-electric-field-induced crack growth behavior of a precrack above the coercive field was evaluated via optical and scanning electron microscopy. The crack extension in the 1.0 vol% Al₂O₃ composite was significantly smaller than that in monolithic PZT and the 0.5 vol% Al₂O₃ composite. Secondary-phase Al₂O₃ dispersoids were found both at grain boundaries and within grains in the composites. A large number of dispersoids were observed at the grain boundaries in the 1.0 vol% Al₂O₃ composite. It appears that the Al₂O₃ dispersoids reinforce the grain boundaries of the PZT matrix as well as act as effective pins against microcrack propagation.

Keywords:	crack growth electrical properties composites