Using X-ray microtomography to evaluate cavity formation in a superplastic magnesium alloy processed by equal-channel angular pressing

Figueiredo, Roberto B., Terzi, Sofiane and Langdon, Terence G. (2010) Using X-ray microtomography to evaluate cavity formation in a superplastic magnesium alloy processed by equal-channel angular pressing. Acta Materialia, 58 17: 5737-5748. doi:10.1016/j.actamat.2010.06.049


Author Figueiredo, Roberto B.
Terzi, Sofiane
Langdon, Terence G.
Title Using X-ray microtomography to evaluate cavity formation in a superplastic magnesium alloy processed by equal-channel angular pressing
Journal name Acta Materialia   Check publisher's open access policy
ISSN 1359-6454
1873-2453
Publication date 2010-01-01
Year available 2010
Sub-type Article (original research)
DOI 10.1016/j.actamat.2010.06.049
Open Access Status Not Open Access
Volume 58
Issue 17
Start page 5737
End page 5748
Total pages 12
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon
Language eng
Subject 2503 Ceramics and Composites
2504 Electronic, Optical and Magnetic Materials
2506 Metals and Alloys
2507 Polymers and Plastics
Abstract The magnesium AZ31 alloy exhibits excellent superplastic properties after processing by equal-channel angular pressing (ECAP) and testing in tension at a temperature of 623 K. Experiments show that there is an increase in the elongations to failure with increasing numbers of passes in ECAP. X-ray microtomography was used to obtain detailed information on the morphologies of cavities developed during superplastic flow and the results were analyzed in terms of the different possible cavity growth mechanisms. The results show that superplastic elongations are attained in this alloy because the finer grain structure introduced by ECAP is associated with lower flow stresses in tensile testing at elevated temperatures and this leads to a reduction in the rate of growth of internal cavities.
Keyword Cavitation
Equal channel angular pressing (ECAP)
Magnesium alloys
Superplasticity
X Ray Microtomography
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mechanical & Mining Engineering Publications
 
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