Microstructure and wear resistance of laser melt depositedMo/ Mo2Ni3 Si metal sil icide alloys
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摘要: 以Mo 、Ni、Si 金属粉末为原料, 利用激光熔化沉积工艺制备出以难熔金属Mo 初生树枝晶为增韧相,以三元金属硅化物Mo2Ni3 Si 为基体的金属硅化物耐磨合金, 在室温干滑动磨损条件下测试了合金的耐磨性能。结果表明, 初生树枝晶的体积分数随着Mo 含量的增加而增加, 而硬度却随之降低。由于金属硅化物Mo2Ni3 Si的高硬度和难熔金属Mo 树枝晶的高强韧性, 合金在室温干滑动磨损条件下具有良好的耐磨性能。Abstract: The wear resistant Mo/ Mo2Ni3 Si metal silicide alloys consisting of ref ractory metal molybdenum primarydendrites toughening phase and interdendritic Mo2Ni3 Si ternary metal silicide mat rix were designed and fabricated bythe laser melt deposition process with molybdenum , nickel and silicon elemental powder as the raw materials.Microst ructures of the alloys were characterized by optical microscopy (OM) , scanning elect ron microscopy (SEM) ,X2ray diff raction (XRD) and energy dispersive spect roscopy ( EDS) . The volume f raction of molybdenum primarydendrites increases with increasing of the molybdenum atomic f raction in the raw material , while the hardness of thealloy decreases as increasing the molybdenum atomic f raction in the raw material. Wear resistance of the laser meltdeposited Mo/ Mo2Ni3 Si metal silicide alloys was evaluated under dry sliding wear test conditions at room temperature. The result s indicate that Mo/ Mo2Ni3 Si metal silicide alloys have out standing wear resistance because of theexcellent combination of high st rength and ductility of the ref ractory metal molybdenum primary dendrites and thehigh hardness and st rong atomic bonds of the Mo2Ni3 Si ternary metal silicide.
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Keywords:
- laser melt deposition /
- metal silicide /
- intermetallics /
- wear
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