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Effect of Ca and Sm Combined Addition on the Microstructure and Elevated-Temperature Mechanical Properties of Mg-6Al Alloys

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Abstract

In the present study, the microstructure and elevated-temperature mechanical properties of Mg-6Al, Mg-6Al-4Ca, Mg-6Al-4Sm and Mg-6Al-2Ca-2Sm alloys were investigated. The experimental results showed that the microstructure and elevated-temperature mechanical property of Mg-6Al alloy changed obviously with the different elements addition. By analyzing the results of optical microscope, x-ray diffraction analysis, scanning electron microscope, and transmission electron microscope, it could be determined that there was only Mg17Al12 phase in Mg-6Al alloy, there were Al2Ca and (Mg, Al)2Ca phases in Mg-6Al-4Ca alloy, there were Al2Sm and Mg17Al12 phases in Mg-6Al-4Sm alloy, and there were (Mg, Al)2Ca, Al2Ca and Al2Sm phases in Mg-6Al-2Ca-2Sm alloy. In addition, the addition of alloying elements including Ca and Sm, especially the composite addition, could significantly improve the tensile properties of Mg-6Al alloy. Compared to Mg-6Al alloy, the tensile strengths of Mg-6Al-2Ca-2Sm alloy at 448, 473 and 498 K were enhanced by 50.32, 87.92, and 94.99%, respectively. Furthermore, when the stretching temperatures were 448 and 473 K, the fracture pattern of Mg-6Al-2Ca-2Sm alloy was the mixture of intergranular fracture and trans-crystalline fracture. However, when the stretching temperature was 498 K, the fracture pattern of Mg-6Al-2Ca-2Sm alloy was the intergranular fracture.

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Acknowledgments

The authors gratefully acknowledge the financial support from the Heilongjiang Province Natural Science Foundation (No. E2018045).

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  1. School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin, 150040, China

    Yanhong Chen, Liping Wang, Yicheng Feng, Erjun Guo, Sicong Zhao & Lei Wang

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  1. Yanhong Chen
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Chen, Y., Wang, L., Feng, Y. et al. Effect of Ca and Sm Combined Addition on the Microstructure and Elevated-Temperature Mechanical Properties of Mg-6Al Alloys. J. of Materi Eng and Perform 28, 2892–2902 (2019). https://doi.org/10.1007/s11665-019-04044-9

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