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Quantitative Analysis of Heterogeneous Microstructure and Diversified Strengthening Mechanisms in Spark Plasma Sintered Molybdenum Disilicide

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Abstract

Molybdenum disilicide (MoSi2) was in situ synthesized by spark plasma sintering into fully dense bulk material. Electron backscatter diffraction revealed that over the range from the center to periphery of the cylindrical sample, the microstructure is heterogeneously constituted by gradually refined MoSi2 grains and increasing amounts of Mo5Si3 impurity phase. The diversified strengthening mechanisms are primarily attributed to the Peierls–Nabarro stress in MoSi2 matrix, the Hall–Petch strengthening effect, and thermal mismatch stress between Mo5Si3 and MoSi2.

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This study was supported by the National Natural Science Foundation of China (51374144), Shanghai Municipal Natural Science Foundation (13ZR1420600), Shanghai Rising-Star Program (14QA1402300), and the National Basic Research Program of China (2011CB012900). QH acknowledges the financial support of the China Scholarship Council (2011831180). The support of EBSD by Instrumental Analysis Centre, Shanghai Jiao Tong University, is gratefully acknowledged.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, P.R. China

    Qiaodan Hu (Associate Professor) & Jianguo Li (Professor)

  2. Defence Materials Technology Centre, Department of Mechanical Engineering, University of Melbourne, VIC, 3010, Australia

    Peng Luo (Researcher)

  3. School of Mechanical Engineering, Shanghai Dian Ji University, Shanghai, 201306, P.R. China

    Peng Luo (Researcher)

  4. School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, P.R. China

    Youwei Yan (Professor)

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  1. Qiaodan Hu
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  2. Peng Luo
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  3. Youwei Yan
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  4. Jianguo Li
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Correspondence to Peng Luo.

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Manuscript submitted March 26, 2014.

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Hu, Q., Luo, P., Yan, Y. et al. Quantitative Analysis of Heterogeneous Microstructure and Diversified Strengthening Mechanisms in Spark Plasma Sintered Molybdenum Disilicide. Metall Mater Trans A 46, 1443–1449 (2015). https://doi.org/10.1007/s11661-015-2785-8

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  • DOI: https://doi.org/10.1007/s11661-015-2785-8

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