High-temperature Mechanical Properties and Fracture Mechanism of Al-Cu-Sc Aluminum Alloy Sheet

YIN Shijie; CUI Xiaolei; LIU Zhangguang; MA Xiangyu; HUA Kun

doi:10.3969/j.issn.1674-6457.2025.08.010

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (8) : 85-93. DOI: 10.3969/j.issn.1674-6457.2025.08.010

Light Alloy Forming

High-temperature Mechanical Properties and Fracture Mechanism of Al-Cu-Sc Aluminum Alloy Sheet

YIN Shijie¹, CUI Xiaolei^1,*, LIU Zhangguang², MA Xiangyu², HUA Kun¹

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Abstract

The work aims to study the mechanical properties, creep characteristics under high temperature-low stress conditions, and high-temperature failure mechanism of Al-Cu-Sc RR heat-resistant aluminum alloy sheet, providing a theoretical basis for the formulation of the sheet forming process and the material selection of related components under service conditions. Tensile tests of O-stated and T6-stated Al-Cu-Sc heat-resistant aluminum alloy sheets at ambient and high temperatures were carried out, while the high-temperature tensile fracture morphology of T6-stated sheets was observed by SEM to analyze the high-temperature fracture mechanism. Furthermore, the high-temperature service performance was evaluated by creep tests. The tensile strength of the O-stated Al-Cu-Sc alloy sheet was 207 MPa at ambient temperature, which decreased significantly to 86 MPa at 300 ℃. After “regression and re-aging treatment” (RR), the tensile strength of the T6-stated sheet at ambient temperature reached 471 MPa, and it still maintained a high value of 280 MPa at 300 ℃ with attenuation of 41% compared with that at ambient temperature. The T6-stated Al-Cu-Sc sheet had a service ability at 300 ℃×60 MPa and 400 ℃×15 MPa for more than 120 min. The fracture mechanism of O-stated and T6-stated sheets below 400 ℃ was ductile fracture. The fracture mechanism of T6-stated sheet at 500 ℃ changed to brittle and ductile mixed fracture. The T6-stated Al-Cu-Sc alloy sheet has excellent strength at both ambient and high temperatures and exhibits good creep resistance in the high temperature range of 300-400 ℃, which has great potential for lightweight components in service under thermal-force coupling conditions.

Key words

heat-resistant aluminum alloy / Al-Cu-Sc alloy sheet / high-temperature performance / creep resistance / fracture mechanism

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YIN Shijie, CUI Xiaolei, LIU Zhangguang, MA Xiangyu, HUA Kun. High-temperature Mechanical Properties and Fracture Mechanism of Al-Cu-Sc Aluminum Alloy Sheet[J]. Journal of Netshape Forming Engineering. 2025, 17(8): 85-93 https://doi.org/10.3969/j.issn.1674-6457.2025.08.010

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