Details

Autor(en) / Beteiligte

• Tian, Ni
• Liu, Jiacheng
• Liu, Hao
• Zhang, Zhisen
• Zhang, Yaozhong
• Zhou, Yiran
• Zhao, Gang
• Qin, Gaowu

Titel

Effect of total content of Zn and Mg on microstructure and mechanical properties of Al-3.2xZn-xMg-1.66Cu-0.15Zr aluminum alloy sheet

Ist Teil von

• Materials science & engineering. A, Structural materials : properties, microstructure and processing, 2024-08, Vol.908, p.146782, Article 146782

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2024

Link zum Volltext

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• The effects of total Zn and Mg content on the microstructure, tensile properties, and fatigue properties of Al-3.2xZn-xMg-1.66Cu alloy sheets were systematically investigated after aging at 120 °C for 24 h. As the total content of Zn and Mg increased, the recrystallized grains were gradually refined, and the types of precipitate particles did not change, all of which comprised Guinier Preston (GP) zones and η′ metastable-phase particles, whereas both the number and volume fraction of η′-phase particles increased gradually, where the particles were first coarsened and then refined. The η′-phase particles were largest (∼8.2 nm) in the alloy with the total Zn and Mg content of 5.15 wt.%. The grain boundary precipitate (GBP) gradually coarsened and the width of the precipitates free zone (PFZ) gradually decreased. When the total content of Zn and Mg was increased from 2.61 to 11.40 wt.%, the yield strength and tensile strength increased from 173 and 309 MPa to 554 and 620 MPa, respectively, whereas the elongation decreased from 29.9% to 8.5%. However, the fatigue strength of the alloy sheet first decreased from 149 to 119 MPa and then increased to 183 MPa under the condition of R = 0.1. The fatigue strength of the alloy sheet with total Zn and Mg contents of 5.15 and 11.40 wt.% were the lowest one and the highest one, respectively, and the latter was 54% higher than the former. •The η′-phase particle coarsens and then refines with the total content of Zn and Mg increased.•The change law of fatigue strength with increasing total content of Zn and Mg is different from tensile properties.•The Al-3.93Zn-1.22Mg-1.66Cu alloy sheet has the largest η′-phase particles and the lowest fatigue strength.•The correlation between the fatigue strength and the size of η′-phase particles of alloy sheets is negative.