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Cavitation Behavior of Coarse-Grained Al-4.5Mg Alloy Exhibiting Superplastic-Like Elongation

Published online by Cambridge University Press:  10 February 2011

H. Iwasaki ,
T. Mori ,
H. Hosokawa ,
T. Tagata ,
M. Mabuchi  and
K. Higashi
H. Iwasaki
Affiliation:
College of Engineering, Department of Materials Science and Engineering, Himeji Institute of Technology, Shosha, Himeji, Hyogo 671-2201, Japan
T. Mori
Affiliation:
College of Engineering, Department of Materials Science and Engineering, Himeji Institute of Technology, Shosha, Himeji, Hyogo 671-2201, Japan
H. Hosokawa
Affiliation:
Graduate Student of Department of Metallurgy and Materials Science, Osaka Prefecture University, Gakuen-cho, Sakai, Osaka 599-8531, Japan
T. Tagata
Affiliation:
SKY Aluminum Co., Ltd, 1351 Uwanodai, Fukaya, Saitama 366-0801, Japan
M. Mabuchi
Affiliation:
National Industrial Research Institute of Nagoya, Hirate-cho, Kita-ku, Nagoya 462-8510, Japan
K. Higashi
Affiliation:
College of Engineering, Department of Metallurgy and Materials Science, Osaka Prefecture University, Gakuen-cho, Sakai, Osaka 599-8531, Japan
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Abstract

Cavitation behaviors related to ferrous primary crystals have been investigated at a temperature of 653 K and a strain rate of 10−3/s for Al-4.5%Mg-0.05%Fe and Al-4.5%Mg-0.2%Fe alloys which have a grain size of 50;Lm. The alloys constantly exhibited a large elongation-to-failure above 300% at the temperature of 653 K and strain rate of 10−3/s. Cavitation was increased by increasing the iron content. Most cavities were nucleated at the interface between the ferrous primary crystal and matrix and elongated parallel to the tensile direction. The experimental critical diameter of the primary crystal, above which cavity is nucleated, was 1.5 µm at the grain boundary and 0.5µm at grain interior, which were very close to double the critical diffusion length.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 601: Symposium HH – Superplasticity-Current Status & Future Potential , 1999 , 67
Copyright
Copyright © Materials Research Society 2000

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