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Study of the micro-yielding behavior in a SiCp/Mg–Zn–Ca composite using synchrotron radiation diffraction

  • Composites & nanocomposites
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Abstract

The present study investigates the mechanical behavior of a SiCp/Mg–5Zn–0.2Ca composite under tensile loading using in-situ synchrotron X-ray diffraction. The composite exhibited a yield strength of 167 MPa, ultimate tensile strength of 276 MPa, and tensile elongation of 15%. It was found that the onset of micro-yielding at a stress level of approximately 40 MPa, which is attributed to the thermal and interfacial mismatches between the SiC particles and α-Mg matrix. Furthermore, load partitioning between the SiC particles and α-Mg grains was observed following the micro-yielding event, indicating micro-load transfer from the softer α-Mg grains to the SiC particles. The occurrence of microcracks at the SiC/Mg phase interfaces after the micro-yielding event may have implications for the composite’s overall fracture behavior. These findings underscore the influence of interfacial thermal mismatch on promoting micro-yielding in the composite. Several factors including reducing forming temperatures, utilizing reinforcements with lower coefficients of thermal expansion, and adjusting the alloying elements can be used to mitigate such micro-yielding effect.

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Acknowledgements

This work was financially supported by the National Key Research and Development Program of China (No. 2022YFB3708400) and the National Natural Science Foundation of China (Nos. 52101180, 51825101, and 52001202). The authors are thankful for the kind help of Li Li at the Teaching Laboratory Center for School of Materials Science and Engineering of Shanghai Jiao Tong University. The authors thank beamline BL14B1 (Shanghai Synchrotron Radiation Facility) for providing the beam time and helps during experiments.

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Authors and Affiliations

  1. National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiao Tong University, Shanghai, 200240, China

    Lidong Gu, Gaoming Zhu, Jie Wang, **gya Wang, Li** Zhou & **aoqin Zeng

  2. School of Mechanical Engineering, Suzhou University of Science and Technology, Suzhou, 215009, China

    Bi** Zhou

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  1. Lidong Gu
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  2. Bi** Zhou
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  3. Gaoming Zhu
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  4. Jie Wang
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  5. **gya Wang
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  6. Li** Zhou
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  7. **aoqin Zeng
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Contributions

LG done investigation and writing—original draft. BZ, GZ, and Jie Wang done investigation, writing—review and editing. **gya Wang and LZ contributed to methodology. XZ helped in resources and supervision.

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Correspondence to Bi** Zhou or **aoqin Zeng.

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Gu, L., Zhou, B., Zhu, G. et al. Study of the micro-yielding behavior in a SiCp/Mg–Zn–Ca composite using synchrotron radiation diffraction. J Mater Sci 59, 1948–1957 (2024). https://doi.org/10.1007/s10853-023-09236-2

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  • DOI: https://doi.org/10.1007/s10853-023-09236-2

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