Elucidating effects of Eu and P on solidification and precipitation of Al-7Si-0.3Mg based alloys refined by Ta and TiB2

Spacil, Ivo; Gehringer, Dominik; Holec, David; Albu, Mihaela; Li, Jiehua

doi:10.1016/j.jallcom.2023.173343

Cited by 2 publications

(1 citation statement)

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“…Arising from the emergence of environmental challenges, such as increasing energy consumption and global warming, the development of high-performance lightweight materials is particularly urgent [1][2][3]. Al-Zn-Mg-Cu alloys have been extensively used as lightweight materials in the automotive and aerospace industries due to their exceptional specific strength, superior processability, and recyclability [4,5].…”

Section: Introductionmentioning

confidence: 99%

Effect of Retrogression with Different Cooling Ways on the Microstructure and Properties of T’/η’ Strengthened Al-Zn-Mg-Cu Alloys

Zhang,

Shen,

Han

et al. 2024

Materials

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Retrogression and re-aging (RRA) treatment has been proven to effectively overcome the trade-off between strength and corrosion resistance. Current research focuses on the heating rate, temperature, and holding time of retrogression treatment while ignoring the retrogression cooling ways. In this paper, the effects of RRA treatment with different retrogression cooling ways on the microstructure and properties of newly developed T’/η’ strengthened Al-Zn-Mg-Cu alloys were investigated by performing tests on mechanical properties, intergranular corrosion (IGC) resistance, and electrochemical corrosion behavior. The results show that the mechanical properties of samples subject to RRA treatment with water-quenching retrogression (ultimate tensile strength, yield strength, and elongation of 419.2 MPa, 370.2 MPa, and 15.9, respectively) are better than those of air-cooled and furnace-cooled samples. The corrosion resistance of water-quenching (IGC depth of 162.2 μm, corrosion current density of 0.833 × 10−5 A/cm2) and furnace-cooled samples (IGC depth of 123.7 μm, corrosion current density of 0.712 × 10−5 A/cm2) is better than that of air-cooled samples. Microstructure characterization reveals that the effect of the retrogression cooling rate on mechanical properties is related to the size of T’/η’ precipitates with grains as well as the proportion of T’ and η’, while the difference in corrosion resistance depends on the continuity of grain boundary precipitates (GBPs). With mechanical properties, corrosion resistance, and time cost taken into consideration, it is appropriate to select water quenching for retrogression. These findings offer valuable insights for further design to achieve superior performance in various applications.

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