Abstract
Four series of Mo2FeB2-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 Mo2FeB2 and the solution of Ti atoms causes the Mo2FeB2 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 Mo2FeB2 promotes the transformation of Mo2FeB2 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∙m1/2, and 1612.6 MPa, respectively.
Highlights
Borides possess high hardness and stable chemical properties
The previous work revealed that Mn atoms replace a fraction of Mo atoms in Mo2 FeB2 particles, and the addition of Mn increases the wettability of liquid phase on Mo2 FeB2
Fracture toughness (KIC ) and transverse rupture strength (TRS) tests of Mo2 FeB2 -based cermets at room temperature were conducted using a three-point bend test [35], whose measurement methods and calculation formulas are provided in supplementary information
Summary
Borides possess high hardness and stable chemical properties. borides are a potential wear-resistant material and have been studied by many scholars [1,2,3]. Ternary boride-based cermets exhibit low density, high fracture toughness, high hardness, excellent wear resistance and good corrosion resistance [6,7,8,9,10]. It was found that V atoms replace partial Mo atoms in Mo2 FeB2 , and decrease particle size of Mo2 FeB2 [20]. The previous work revealed that Mn atoms replace a fraction of Mo atoms in Mo2 FeB2 particles, and the addition of Mn increases the wettability of liquid phase on Mo2 FeB2. It was reported that Cr atoms replace a fraction of Mo atoms in Mo2 FeB2 particles, decreases the particle and increases the sphericity of Mo2FeB. 2 hard analyses, a general rule can be obtained that doped elements replace partial. The atomic hard phase can be replaced by other atoms which have similar atomic radii.
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