Effects of Sc and Be Microalloying Elements on Mechanical Properties of Al-Zn-Mg-Cu (Al7xxx) Alloy

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 co...

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Bibliographic Details
Published in:Metals (Basel ) 2023-02, Vol.13 (2), p.340
Main Authors: Won, Sung-Jae, So, Hyeongsub, Han, Jung-Woo, Oh, Soong Ju, Kang, Leeseung, Kim, Kyou-Hyun
Format: Article
Language:English
Subjects:
7xxx series aluminum alloy
Alloys
Aluminum base alloys
Copper
Copper base alloys
Crack initiation
Crack propagation
Grain boundaries
Grain refinement
Grain size
Intermetallic compounds
Investigations
Magnesium
Mechanical properties
Microalloying
Microscopy
Precipitation hardening
Scandium
Solid solutions
Specialty metals industry
Tensile properties
Tensile strength
Zinc
Zinc compounds
Zirconium
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Summary: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.
ISSN:2075-4701
2075-4701
DOI:10.3390/met13020340