Effect of ZrO2(Y2O3) content on mechanical properties of Mo-12Si-8.5B-ZrO2(Y2O3) composites with bimodal grain-size distribution

YAN Jianhui; KANG Rong; TANG Xing; WANG Yi; QIU Jingwen

doi:10.13801/j.cnki.fhclxb.20210129.002

Volume 38 Issue 11

Nov. 2021

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YAN Jianhui, KANG Rong, TANG Xing, et al. Effect of ZrO2(Y2O3) content on mechanical properties of Mo-12Si-8.5B-ZrO2(Y2O3) composites with bimodal grain-size distribution[J]. Acta Materiae Compositae Sinica, 2021, 38(11): 3747-3756. doi: 10.13801/j.cnki.fhclxb.20210129.002

Citation:

YAN Jianhui, KANG Rong, TANG Xing, et al. Effect of ZrO₂(Y₂O₃) content on mechanical properties of Mo-12Si-8.5B-ZrO₂(Y₂O₃) composites with bimodal grain-size distribution[J]. Acta Materiae Compositae Sinica, 2021, 38(11): 3747-3756. doi: 10.13801/j.cnki.fhclxb.20210129.002

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Effect of ZrO₂(Y₂O₃) content on mechanical properties of Mo-12Si-8.5B-ZrO₂(Y₂O₃) composites with bimodal grain-size distribution

doi: 10.13801/j.cnki.fhclxb.20210129.002

YAN Jianhui^{1, 2, 3
,
,},
KANG Rong^1
,,
TANG Xing^1
,,
WANG Yi^{1, 2, 3
,},
QIU Jingwen^{1, 2, 3
,}

1.
School of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan 411201, China
2.
Hunan Provincial Key Defense Laboratory of High Temperature Wear Resisting Materials and Preparation Technology, Hunan University of Science and Technology, Xiangtan 411201, China
3.
Hunan Provincial Key Laboratory of Advanced Materials for New Energy Storage and Conversion, Hunan University of Science and Technology, Xiangtan 411201, China

Received Date: 2020-11-12
Accepted Date: 2021-01-16

Available Online: 2021-01-29

Publish Date: 2021-11-01

Abstract

Abstract

Multiphase Mo-12Si-8.5B alloy is a promising high-temperature structural material. In order to further simultaneously improve the strength and toughness of the Mo-12Si-8.5B alloy, the method of strengthening and toughening the bimodal grain size Mo-12Si-8.5B alloy with adding nano-ZrO₂ (Y₂O₃) particles was put out. Nanometer Mo-ZrO₂ (Y₂O₃) composite powders were successfully prepared by sol-gel and high-temperature hydrogen reduction method, and a series of Mo-12Si-8.5B-ZrO₂ (Y₂O₃) composites with a bimodal grain size distribution were fabricated via spark plasma sintering (SPS) using nanometer Mo-ZrO₂ (Y₂O₃) and micrometer Mo powders as raw materials. The results show that the particle size of Mo powders and the relative density of the sintered body decrease with the increase of the ZrO₂ (Y₂O₃) content. When the ZrO₂ (Y₂O₃) content is less than 2.5wt%, the relative density is above 98.1%. As the content of ZrO₂ (Y₂O₃) are 1.5wt% and 2.5wt%, the composites exhibit the high hardness (9.76-9.98 GPa), flexural strength (672-678 MPa) and fracture toughness (12.68-12.82 MPa·m^1/2). Grain refinement of the Mo, grain boundary strengthening of the nanometer/micrometer Mo grains and the second-phase strengthening of the nano-ZrO₂(Y₂O₃) particles attribute to the increase of the hardness and flexural strength. The coarse grain Mo and nanometer ZrO₂ (Y₂O₃) in the composites contribute to the improvement of the fracture toughness. The toughening mechanisms of the Mo-12Si-8.5B-ZrO₂ (Y₂O₃) composites are crack deflection and crack bridging.
- Mo-12Si-8.5B,
- ZrO₂(Y₂O₃),
- bimodal grain size,
- mechanical properties,
- composites
Long Abstrsct
Innovation Points

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References(27)

References

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