Abstract
Through carrying out the high-temperature tensile experiments on an as-extruded Mg–11wt%Y alloy at 350 °C, 400 °C, 450 °C, 500 °C and 550 °C, the mechanical behavior and fracture mechanisms at elevated temperatures are investigated and compared. Tensile results show that with the increase of temperature, the yield strength and ultimate tensile strength of the alloy increase at first and then decrease, while that the elongation ratio decreases firstly and then increases. For the sample being tested at 350 °C, the values of yield strength, ultimate tensile strength and the elongation ratio are 188 MPa, 266 MPa and 11%, respectively. At 400 °C, the yield strength and ultimate tensile strength reach the maximum values of, respectively, 198 MPa and 277 MPa, but the elongation ratio is the lowest and its value is only 8%. When the applied temperature is increased to 550 °C, the values of yield strength and ultimate tensile strength, respectively, decrease to 140 MPa and 192 MPa and the elongation ratio increases to 38%. Failure analysis demonstrates that the fracture surfaces of different samples are mainly composed of plastic dimples and exhibit the typical characteristic of ductile fracture. The observation to the fracture side surfaces indicates that at the temperatures of 350 °C and 400 °C, microcracks mainly initiate in the interior of Mg24Y5 particles. When the temperatures are 450 °C, 500 °C and 550 °C, the cracks preferentially initiate at the Mg24Y5/α-Mg interfaces.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Nos. U21A2049, 52071220, 51871211, 51701129 and 51971054), the Liaoning Province's project of “Revitalizing Liaoning Talents” (XLYC1907062), the Doctor Startup Fund of Natural Science Foundation Program of Liaoning Province (No. 2019-BS-200), the Strategic New Industry Development Special Foundation of Shenzhen (JCYJ20170306141749970), the funds of International Joint Laboratory for Light Alloys, Liaoning BaiQianWan Talents Program, the Domain Foundation of Equipment Advance Research of 13th Five-year Plan (61409220118), the National Key Research and Development Program of China (Nos. 2017YFB0702001 and 2016YFB0301105), the Innovation Fund of Institute of Metal Research (IMR), Chinese Academy of Sciences (CAS), the National Basic Research Program of China (973 Program) (No. 2013CB632205) and the Fundamental Research Fund for the Central Universities (No. N2009006), the Bintech-IMR R&D Program (No. GYY-JSBU-2022-009).
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Zhang, L., Xu, DK., Wang, BJ. et al. Mechanical Behavior and Failure Mechanism of an As-Extruded Mg–11wt%Y Alloy at Elevated Temperature. Acta Metall. Sin. (Engl. Lett.) (2024). https://doi.org/10.1007/s40195-024-01700-5
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DOI: https://doi.org/10.1007/s40195-024-01700-5