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Indexed by:期刊论文

Date of Publication:2012-08-30

Journal:MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

Included Journals:SCIE、EI、Scopus

Volume:552

Page Number:230-235

ISSN No.:0921-5093

Key Words:Gd; Y; Microstructure; Mechanical properties

Abstract:Three kinds of alloys Al-Zn-Mg-Cu-Zr, Al-Zn-Mg-Cu-Zr-Gd and Al-Zn-Mg-Cu-Zr-Gd-Y were prepared by cast metallurgy. The effects of Gd and Y additions on the microstructure and properties of Al-Zr-Mg-Cu-Zr alloys were investigated by optical microscopy (OM), tensile test, scanning electron microscopy (SEM), electronic probe microanalysis (EPMA) and transmission electronic microscopy (TEM). The results show that the combined additions of Gd and Y to the Al-Zn-Mg-Cu-Zr alloys effectively retard the mergence and growth of the sub-grain during the recovery process, significantly inhibit the recrystallization of Al matrix. sigma(b), sigma(0.2) and delta are improved with increasing Gd and Y content, and the improving amplitudes reach 11.49%, 14.61%, 63.11% respectively and have better relative intracrystalline solubility. (C) 2012 Elsevier B.V. All rights reserved.