Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 526, Issue 1-2, Pages 177-184Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2009.07.027
Keywords
Magnesium alloy; Age-hardening; Precipitation; GP zone; TEM; HAADF
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Funding
- MEXT, Japan
- [18360339, 2006]
- [21360348, 2009]
- Grants-in-Aid for Scientific Research [21360348] Funding Source: KAKEN
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We have investigated the age-hardening responses and corresponding microstructures of Mg-0.3Ca-xZn (x = 0.0, 0.1, 0.3, 0.6, 1.0, 1.6 at.%) alloys by hardness test, transmission electron microscopy (TEM), and high-angle annular dark field-scanning transmission electron microscopy (HAADF-STEM). Zn additions up to x = 0.6 lead to enhanced age-hardening responses with the highest peak hardness of HV = 69 for x = 0.6. Further addition of Zn degraded the age-hardening responses. HAADF-STEM images revealed that the finely dispersed monolayer G.P. zones with internal ordered structure are the major contributor to the age-hardening. Excess addition of Zn resulted in the formation of Ca2Mg6Zn3 precipitates suppressing the formation of the ordered G.P. zones. (C) 2009 Elsevier B.V. All rights reserved.
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