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Anisotropic Yield Behavior of Lotus-Type Porous Iron: Measurements and Micromechanical Mean-Field Analysis

Published online by Cambridge University Press:  03 March 2011

M. Tane ,
T. Ichitsubo ,
S.K. Hyun  and
H. Nakajima
M. Tane*
Affiliation:
The Institute of Scientific and Industrial Research, Osaka University, Ibaraki 567-0047, Japan
T. Ichitsubo
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
S.K. Hyun
Affiliation:
The Institute of Scientific and Industrial Research, Osaka University, Ibaraki 567-0047, Japan
H. Nakajima
Affiliation:
The Institute of Scientific and Industrial Research, Osaka University, Ibaraki 567-0047, Japan
*
a)Address all correspondence to this author. e-mail: mtane@sanken.osaka-u.ac.jp
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Abstract

Anisotropic yield behavior of lotus-type porous iron fabricated using the continuous-zone-melting method in a pressurized nitrogen and hydrogen atmosphere has been investigated. The 0.2% offset strength (compressive yield stress) in the loading direction parallel to the longitudinal axis of pores decreases linearly with increasing porosity, while the perpendicular strength decreases steeply. The strength versus porosity curves can be expressed using a well-known power law formula. In addition, the 0.2% offset strength of lotus iron prepared in a nitrogen and hydrogen atmosphere is found to be larger than that of lotus iron prepared in a hydrogen and helium atmosphere, which is attributed to the solid solution hardening by the solute nitrogen. Furthermore, we compare the experimental results to calculations obtained by means of the extended Qiu-Weng’s mean-field method, and the comparison suggests that local stresses deviated from the average stress are dominant in the macroscopic yield behavior of lotus metals.

Keywords

Mechanical structureMetalPorosity
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 1 , January 2005 , pp. 135 - 143
Copyright
Copyright © Materials Research Society 2004

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