Journal
SCRIPTA MATERIALIA
Volume 139, Issue -, Pages 34-38Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2017.06.012
Keywords
Magnesium alloys; Creep; Precipitation; Transmission electron microscopy
Categories
Funding
- JSPS [JP 16K18266]
- JST, Advanced Low Carbon Technology Research and Development Program (ALCA) [12102886]
- Grants-in-Aid for Scientific Research [16K18266] Funding Source: KAKEN
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Only trace Ca addition to the Mg-2Gd-0.5Zn-0.2Zr (at.%) alloy leads to the precipitation of Guinier-Preston (GP) zones and remarkably improves the creep resistance at elevated temperatures. The Mg-2Gd-0.5Zn-0.4Ca-0.2Zr alloy exhibits a minimum creep rate of 5.75 x 10(-8)s(-1) tested at 250 degrees C and 110 MPa, its superior creep resistance is attributed to the precipitation of dense GP zones on the basal plane, increment in number density of refined 13 phases on the prismatic plane of the alpha-Mg matrix, narrow precipitate free zones (PFZs) and strengthened long period stacking ordered (LPSO) phases by trace concentration of Ca. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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