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
We demonstrate via comprehensive microstructural investigation the effects of Sc and Be microalloying on the mechanical properties of Al-Zn-Mg-Cu-based alloys, where Sc microalloying enhances the tensile properties of an Al-9.0Zn-3.0Mg-3.0Cu alloy from 645 MPa (εf = ~6%) to 672 MPa (εf = ~8%). In contrast, simultaneous microalloying with Sc and Be reduces the mechanical strength of a synthesized Al alloy to 654 MPa (εf = ~8%). Comprehensive microstructural investigation revealed that Sc microalloying leads to Al grain refinement, the formation of hardening (MgZn2, Al3M) phases, and an increase in the solid solution of Al. Additional Be microalloying also enhances the formation of MgZn2 phase, while Al3M (M: Zr, Sc) type phases are restrained from forming in Al grains. Furthermore, solid solution in Al grains is reduced by the trace addition of Be microalloying, resulting in an increase in large intermetallic compounds at Al grain boundaries.
Funder
Institute of Civil Military Technology Cooperation
Defense Acquisition Program Administration and
the Ministry of Trade, Industry and Energy of the Korean Government
R&D program and research facilities of the Korea Institute of Industrial Technology
Subject
General Materials Science,Metals and Alloys
Cited by
1 articles.
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