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Interactions between toughening mechanisms: Transformation toughening versus plastic deformation

Published online by Cambridge University Press:  31 January 2011

Wei-Hsing Tuan  and
Rong-Zhi Chen
Wei-Hsing Tuan
Affiliation:
Department of Materials Science and Engineering, National Taiwan University, Taipei 106, Taiwan, Republic of China
Rong-Zhi Chen
Affiliation:
High Temperature Materials Sec., Materials & Electro-Optics Research Division, Chung-Shan Institute of Science and Technology, Lung-tan, Tao-Yuan 325, Taiwan, Republic of China
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Abstract

In this study, the interactions between transformation toughening and plastic stretching were investigated experimentally. Zirconia and metals, nickel or silver, were incorporated simultaneously into an alumina matrix. The extent of phase transformation of zirconia particles was enhanced due to the coexistence of soft metals. The ductility of nickel was also enhanced in the Al2O3–Ni–ZrO2 composites. However, the presence of zirconia particles at the alumina/silver interface reduced the ability of silver to deform plastically. Due to the interactions, the ratio of composite toughness to matrix toughness for the Al2O3–Ni–ZrO2 composite was higher than the product of the ratio of the composites containing only nickel and only zirconia.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 11 , November 2002 , pp. 2921 - 2928
Copyright
Copyright © Materials Research Society 2002

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