Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/18296
Title: Effect of stress state on cavitation and hot forming limits of a coarse-grained Al5052 alloy
Authors: Chow, KK
Chan, KC 
Keywords: Al5052 alloy
Cavitation behaviour
Coarse grain
Limit strains
Issue Date: 2002
Publisher: North-Holland
Source: Materials letters, 2002, v. 52, no. 1-2, p. 62-68 How to cite?
Journal: Materials letters 
Abstract: Effect of stress state on cavitation and deformation behaviour of superplastic or superplastic-like materials has less been investigated. A coarse-grained Al5052 alloy was deformed at its optimal temperature of 873 K under different biaxial stress states. A superplastic gas forming tester with die aspect ratios of 1, 0.75, 0.5 and 0.375 was used. It is observed that the amount of cavities increases with increasing strain level. More and larger cavities were observed at higher strain levels for all stress states. It is also found that an increase in stress ratio will slightly increase the cavity growth rate. An experimental forming limit curve of the alloy was constructed, and an analytical model based on M-K model and damage mechanics approach has been applied to predict limit strains of the alloy based on experimental cavitation data. It is found that the limit strain increases with increasing f0 and decreases with increasing DB0/DA0. The prediction is in reasonable agreement with the experimental limit strains.
URI: http://hdl.handle.net/10397/18296
ISSN: 0167-577X
EISSN: 1873-4979
DOI: 10.1016/S0167-577X(01)00367-6
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