Synergistic alloy design concept for new high-strength Al–Mg–Si thick plate alloys
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in: Materialia, Jahrgang 15, 100997, 03.2021.
Publikationen: Beitrag in Fachzeitschrift › Artikel › Forschung › (peer-reviewed)
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TY - JOUR
T1 - Synergistic alloy design concept for new high-strength Al–Mg–Si thick plate alloys
AU - Schmid, Florian
AU - Weißensteiner, Irmgard
AU - Tunes, Matheus A.
AU - Kremmer, Thomas
AU - Ebner, Thomas
AU - Morak, Roland
AU - Uggowitzer, Peter J.
AU - Pogatscher, Stefan
N1 - Publisher Copyright: © 2021 Acta Materialia Inc.
PY - 2021/3
Y1 - 2021/3
N2 - With the aim of fully exploiting the advantageous strength-to-weight ratio evident in Al–Mg–Si alloys, this study presents measures for increasing the yield strength of an EN AW-6082 type plate alloy. In addition to describing the thermodynamic simulation-based adjustment of age-hardenable elements (Si, Mg and Cu) and a modified artificial ageing treatment, it investigates the effects of adding a small amount of Zr. The significant strengthening induced by adding Zr is correlated with sub-grain boundary hardening in a recovered microstructure after solution annealing at 570 °C, compared with the almost entirely recrystallized microstructure in an unmodified EN AW-6082 alloy. In combination with a maximum dissolvable number of age-hardenable elements and interrupted quenching, which comprises an improved heat treatment strategy for thick plates, it is seen that the yield strength can be increased by more than 40% to 411 MPa compared to conventional EN AW-6082 base material as verified by tensile testing. In the study scanning electron microscopy and scanning transmission electron microscopy were performed for microstructural characterization with a focus on particle and deformation analysis. All individual contributions which generated the superior strength are calculated and discussed in order to reveal the microstructure-property relationship.
AB - With the aim of fully exploiting the advantageous strength-to-weight ratio evident in Al–Mg–Si alloys, this study presents measures for increasing the yield strength of an EN AW-6082 type plate alloy. In addition to describing the thermodynamic simulation-based adjustment of age-hardenable elements (Si, Mg and Cu) and a modified artificial ageing treatment, it investigates the effects of adding a small amount of Zr. The significant strengthening induced by adding Zr is correlated with sub-grain boundary hardening in a recovered microstructure after solution annealing at 570 °C, compared with the almost entirely recrystallized microstructure in an unmodified EN AW-6082 alloy. In combination with a maximum dissolvable number of age-hardenable elements and interrupted quenching, which comprises an improved heat treatment strategy for thick plates, it is seen that the yield strength can be increased by more than 40% to 411 MPa compared to conventional EN AW-6082 base material as verified by tensile testing. In the study scanning electron microscopy and scanning transmission electron microscopy were performed for microstructural characterization with a focus on particle and deformation analysis. All individual contributions which generated the superior strength are calculated and discussed in order to reveal the microstructure-property relationship.
KW - Alloy design
KW - Aluminum alloys
KW - Precipitation strengthening
KW - Wrought alloys
UR - https://doi.org/10.1016/j.mtla.2020.100997
UR - http://www.scopus.com/inward/record.url?scp=85099253029&partnerID=8YFLogxK
U2 - 10.1016/j.mtla.2020.100997
DO - 10.1016/j.mtla.2020.100997
M3 - Article
VL - 15
JO - Materialia
JF - Materialia
SN - 2589-1529
M1 - 100997
ER -