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Ceramist 2006;9(6):49-55.
Published online December 31, 2006.
Strengthening and Toughening Mechanisms of Alumina-based Nanocomposites
Hideo Awaji1, Sung-Ho Cheon2, Seong-Min Choi3
1Nagoya Institute of Technology
2The Research Institute of Daiyang Ind.Co.
3Fuji Electic Device Technology Co., Ltd.
알루미나 기재 복합재료의 고강도 고인성화 기구
아와이 히데오1, 천승호2, 최성민3
1옥공업대학물질공학
2㈜대양산업기술연구소
3부사전기디바이스테크놀로지㈜
Abstract
Intra-type alumina-based nanocomposites, in which second-phase nanoparticles are embedded within alumina grains, use dislocation activities to enhance strength and fracture toughness. The dislocations are generated around the nanoparticles by residual stresses during cooling process. In this paper, first, we explain strengthening and toughening mechanisms of alumina-based nanocomposites based on dislocation activities. Second, we propose a soaking method to construct the intra-type nanostructure and fabricate alumina/nickel and alumina/silver nanocomposites. The nanocomposites are then annealed in order to enhance the fracture toughness of the materials. Finally, we discuss the relation between the strength, fracture toughness, and critical frontal process zone size of the materials.
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