期刊
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
卷 497, 期 1-2, 页码 426-431出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2008.07.028
关键词
Dispersoid; Ytterbium; Recrystallization; Intergranular corrosion; Exfoliation corrosion
类别
资金
- National Basic Research Program of China [2005CB623704]
- National Natural Science Foundation of China [50471057, 50721003]
The effect of complex additions of Yb, Cr and Zr on recrystallization and corrosion resistance of Al-Zn-Mg-Cu alloy has been investigated. By complex additions of Yb, Cr and Zr to Al-Zn-Mg-Cu alloy, 20-50 nm dispersoids were formed in Al matrix and identified by X-ray diffraction analysis and energy dispersive X-ray spectroscopy as Zn, Mg, Cu, Zr-containing YbCr(2)Al(20) with cubic CeCr(2)Al(20) crystal structure. The dispersoids remarkably inhibited the recrystallization of Al matrix, and a lot of low angle grain boundary of the Al-Zn-Mg-Cu alloy by complex additions of Zr, Cr and Yb investigated by electron back scattered diffraction was retained. Complex additions of Yb, Cr and Zr to Al-Zn-Mg-Cu alloy remarkably enhanced resistance to stress corrosion cracking (K(ISCC)) from 9.8 to 17.0 MPa m(1/2), exfoliation corrosion from EB+ to EA and intergranular Corrosion with the improved strength, fracture toughness and ductility. (C) 2008 Elsevier B.V. All rights reserved.
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