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

被引：0
|
作者：
Yan J. [1 ,2 ,3 ]
Kang R. [1 ]
Tang X. [1 ]
Wang Y. [1 ,2 ,3 ]
Qiu J. [1 ,2 ,3 ]
机构：
[1] School of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan
[2] Hunan Provincial Key Defense Laboratory of High Temperature Wear Resisting Materials and Preparation Technology, Hunan University of Science and Technology, Xiangtan
[3] Hunan Provincial Key Laboratory of Advanced Materials for New Energy Storage and Conversion, Hunan University of Science and Technology, Xiangtan
来源：
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2021年 / 38卷 / 11期
关键词：
Bimodal grain size; Composites; Mechanical properties; Mo-12Si-8.5B; ZrO[!sub]2[!/sub](Y[!sub]2[!/sub]O[!sub]3[!/sub]);
D O I：
10.13801/j.cnki.fhclxb.20210129.002
中图分类号：
学科分类号：
摘要：
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·m1/2). 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. © 2021, Editorial Office of Acta Materiae Compositae Sinica. All right reserved.
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页码：3747 / 3756
页数：9
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