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Sintering Mechanism Microstructure Evolution and Mechanical Properties of Ti-Added Mo2FeB2-Based Cermets

机译:添加Ti的Mo2FeB2基金属陶瓷的烧结机理组织演变及力学性能

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摘要

Four series of Mo FeB -based cermets with Ti contents between 0 wt.% and 1.5 wt.% in 0.5 wt.% increments were prepared by in situ reaction and liquid phase sintering technology. Influences of Ti on microstructure and mechanical properties of cermets were studied. It was found that Ti addition increases formation temperatures of liquid phases in liquid-phase stage. Ti atoms replace a fraction of Mo atoms in Mo FeB and the solution of Ti atoms causes the Mo FeB crystal to be equiaxed. In addition, the cermets with 1.0 wt.% Ti content exhibit the smallest particle size. The solution of Ti atoms in Mo FeB promotes the transformation of Mo FeB particles from elongated shape to equiaxed shape. With Ti content increasing from 0 wt.% to 1.5 wt.%, the hardness and transverse rupture strength (TRS) first increase and then decrease. The maximum hardness and TRS occur with 1.0 wt.% Ti content. However, the fracture toughness decreases as Ti content increases. The cermets with 1.0 wt.% Ti content show excellent comprehensive mechanical properties, and the hardness, fracture toughness, and TRS are HRA 89.5, 12.9 MPa∙m , and 1612.6 MPa, respectively.
机译:通过原位反应和液相烧结技术制备了Ti含量在0wt。%至1.5 wt。%之间的四个系列的Mo FeB基金属陶瓷,其增量为0.5 wt。%。研究了钛对金属陶瓷显微组织和力学性能的影响。已经发现,Ti的添加增加了液相阶段中液相的形成温度。 Ti原子替代了Mo FeB中的Mo原子,而Ti原子的溶液使Mo FeB晶体等轴。此外,Ti含量为1.0重量%的金属陶瓷具有最小的粒径。 Mo FeB中的Ti原子溶液可促进Mo FeB颗粒从细长形状转变为等轴形状。随着Ti含量从0重量%增加到1.5重量%,硬度和横向断裂强度(TRS)首先增加然后降低。 Ti含量为1.0 wt。%时会出现最大硬度和TRS。但是,随着Ti含量的增加,断裂韧性降低。 Ti含量为1.0 wt。%的金属陶瓷具有优异的综合机械性能,硬度,断裂韧性和TRS分别为HRA 89.5、12.9 MPa∙m和1612.6 MPa。

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