Affiliation:
1. Korea-Russia Innovation Center, Korea Institute of Industrial Technology, Incheon 21655, Republic of Korea
2. Department of Materials Science and Engineering, Korea University, Seoul 02841, Republic of Korea
Abstract
In this study, we use microstructural investigation to examine the effects of Sc and Ag microalloying elements on the mechanical properties of Al-Zn-Mg-Cu-based (7050) alloy. Macroscopically, Sc and Ag microalloying elements significantly reduce the formation of intermetallic particles of S (Al2CuMg) and T (Mg32(Al, Zn)49) and of stable η (MgZn2) phase in Al7050 alloy. In addition, Sc microalloying element facilitates the precipitation of the η’ (MgZn2) hardening phase, while Ag microalloying element impedes the formation of the η’ (MgZn2) hardening phase. As a result, trace addition of Sc enhances the σUTS value of the Al7050 alloy from 552 MPa to 594 MPa without lowering the elongation of the Al7050 alloy (15.0% → 15.5%). In contrast, the tensile strength of the Al7050 alloy decreases from 552 MPa to 456 MPa with the addition of Ag microalloying element, while the elongation increases from 15.0% to 21.0%.
Funder
Defense Acquisition Program Administration and the Ministry of Trade, Industry, and Energy of the Korean Government
Subject
General Materials Science,Metals and Alloys
Cited by
2 articles.
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