期刊
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
卷 496, 期 1-2, 页码 425-433出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2008.06.005
关键词
Age-hardening; Precipitation; GP zone; Transmission electron microscopy; Three-dimensional atom probe
类别
资金
- Ministry of Industry, Trade and Energy
- the 21st Century Frontier R&D Programs of the Ministry of Science and Technology, Korea through the Korea Institute of Science and Technology
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [18360339]
- National Research Foundation of Korea [15-2008-00-002-00] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Grants-in-Aid for Scientific Research [18360339] Funding Source: KAKEN
The age-hardening response and microstructural variation Mg-Zn and Mg-Zn-Al alloys were examined by hardness test, transmission electron microscopy (TEM) and three-dimensional atom probe. The samples were prepared by hot-extrusion after casting. The two-step aged samples exhibit enhanced age-hardening response at an earlier stage compared to the single-aged ones. TEM observations exhibited that the peak aged Mg-Zn samples had two kinds of precipitates: one was a rod along the c-axis of the matrix phase; the other was a plate lying on the basal plane. The Mg-Zn-Al samples had rods and cuboidal precipitates. After two-step aging, the microstructure becomes finer for both the Mg-Zn and Mg-Zn-Al alloys. The rodlike precipitates were dominant in the peak aged Mg-Zn alloy, while the comparable number of rods and cuboidal precipitates were present in the Mg-Zn-Al alloy. Atom probe analyses for the samples pre-aged at 70 degrees C clearly showed the formation of Zn-rich zones. (C) 2008 Elsevier B.V. All rights reserved.
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